| Records |
| Author |
Mahajan, S.M.; Asenjo, F.A. |
| Title |
Explicitly covariant dispersion relations and self-induced transparency |
Type |
|
| Year |
2017 |
Publication  |
Journal Of Plasma Physics |
Abbreviated Journal |
J. Plasma Phys. |
| Volume |
83 |
Issue |
|
Pages |
15 pp |
| Keywords |
magnetized plasmas; plasma waves |
| Abstract |
Explicitly covariant dispersion relations for a variety of plasma waves in unmagnetized and magnetized plasmas are derived in a systematic manner from a fully covariant plasma formulation. One needs to invoke relatively little known invariant combinations constructed from the ambient electromagnetic fields and the wave vector to accomplish the program. The implication of this work applied to the self- induced transparency effect is discussed. Some problems arising from the inconsistent use of relativity are pointed out. |
| Address |
[Mahajan, S. M.] Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 USA, Email: mahajan@mail.utexas.edu; |
| Corporate Author |
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Thesis |
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| Publisher |
Cambridge Univ Press |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0022-3778 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
WOS:000396123100018 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
713 |
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| Author |
Moya-Cessa, H.M.; Asenjo, F.A.; Hojman, S.A.; Soto-Eguibar, F. |
| Title |
Two-mode squeezed state generation using the Bohm potential |
Type |
|
| Year |
2022 |
Publication |
Modern Physics Letters B |
Abbreviated Journal |
Mod. Phys. Lett. B |
| Volume |
36 |
Issue |
09 |
Pages |
2250025 |
| Keywords |
Time-dependent coupled harmonic oscillator; Bohm potential; entangled states; two-mode squeezed states |
| Abstract |
We show that two-mode squeezed vacuum-like states may be engineered in the Bohm-Madelung formalism by adequately choosing the phase of the wave function. The difference between our wave function and the one of the squeezed vacuum states is given precisely by the phase we selected. We would like to stress that the engineering of two-mode vacuum states is possible due to the existence of the Bohm potential, and it is relevant because of its potential use in the propagation of optical fields, where it may render a variety of applications in optics. The approach to generate non-classical states, namely, two-mode squeezed states of a quantum mechanical system is one of the first applications of the Madelung-Bohm formalism. |
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Place of Publication |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0217-9849 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000782958100001 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1572 |
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| |
| Author |
Mahajan, S.M.; Asenjo, F.A.; Hazeltine, R.D. |
| Title |
Comparison of the electron-spin force and radiation reaction force |
Type |
|
| Year |
2015 |
Publication |
Monthly Notices Of The Royal Astronomical Society |
Abbreviated Journal |
Mon. Not. Roy. Astron. Soc. |
| Volume |
446 |
Issue |
4 |
Pages |
4112-4115 |
| Keywords |
magnetic fields; plasmas; radiation mechanisms: general |
| Abstract |
It is shown that the forces that originate from the electron-spin interacting with the electromagnetic field can play, along with the Lorentz force, a fundamentally important role in determining the electron motion in a high energy density plasma embedded in strong high-frequency radiation, a situation that pertains to both laser-produced and astrophysical systems. These forces, for instance, dominate the standard radiation reaction force as long as there is a 'sufficiently' strong ambient magnetic field for affecting spin alignment. The inclusion of spin forces in any advanced modelling of electron dynamics pertaining to high energy density systems (for instance in particle-in-cell codes), therefore, is a must. |
| Address |
[Mahajan, Swadesh M.; Hazeltine, Richard D.] Univ Texas Austin, Inst Fus Studies, Austin, TX 78712 USA, Email: felipe.asenjo@uai.cl |
| Corporate Author |
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Thesis |
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| Publisher |
Oxford Univ Press |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0035-8711 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000350272400066 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
462 |
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| |
| Author |
Munoz, V.; Asenjo, F.A.; Dominguez, M.; Lopez, R.A.; Valdivia, J.A.; Vinas, A.; Hada, T. |
| Title |
Large-amplitude electromagnetic waves in magnetized relativistic plasmas with temperature |
Type |
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| Year |
2014 |
Publication |
Nonlinear Processes In Geophysics |
Abbreviated Journal |
Nonlinear Process Geophys. |
| Volume |
21 |
Issue |
1 |
Pages |
217-236 |
| Keywords |
|
| Abstract |
Propagation of large-amplitude waves in plasmas is subject to several sources of nonlinearity due to relativistic effects, either when particle quiver velocities in the wave field are large, or when thermal velocities are large due to relativistic temperatures. Wave propagation in these conditions has been studied for decades, due to its interest in several contexts such as pulsar emission models, laser-plasma interaction, and extragalactic jets. For large-amplitude circularly polarized waves propagating along a constant magnetic field, an exact solution of the fluid equations can be found for relativistic temperatures. Relativistic thermal effects produce: (a) a decrease in the effective plasma frequency (thus, waves in the electromagnetic branch can propagate for lower frequencies than in the cold case); and (b) a decrease in the upper frequency cutoff for the Alfven branch (thus, Alfven waves are confined to a frequency range that is narrower than in the cold case). It is also found that the Alfven speed decreases with temperature, being zero for infinite temperature. We have also studied the same system, but based on the relativistic Vlasov equation, to include thermal effects along the direction of propagation. It turns out that kinetic and fluid results are qualitatively consistent, with several quantitative differences. Regarding the electromagnetic branch, the effective plasma frequency is always larger in the kinetic model. Thus, kinetic effects reduce the transparency of the plasma. As to the Alfven branch, there is a critical, nonzero value of the temperature at which the Alfven speed is zero. For temperatures above this critical value, the Alfven branch is suppressed; however, if the background magnetic field increases, then Alfven waves can propagate for larger temperatures. There are at least two ways in which the above results can be improved. First, nonlinear decays of the electromagnetic wave have been neglected; second, the kinetic treatment considers thermal effects only along the direction of propagation. We have approached the first subject by studying the parametric decays of the exact wave solution found in the context of fluid theory. The dispersion relation of the decays has been solved, showing several resonant and nonresonant instabilities whose dependence on the wave amplitude and plasma temperature has been studied systematically. Regarding the second subject, we are currently performing numerical 1-D particle in cell simulations, a work that is still in progress, although preliminary results are consistent with the analytical ones. |
| Address |
[Munoz, V.; Dominguez, M.; Lopez, R. A.; Valdivia, J. A.] Univ Chile, Fac Ciencias, Dept Fis, Santiago, Chile, Email: vmunoz@fisica.ciencias.uchile.cl |
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Thesis |
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| Publisher |
Copernicus Gesellschaft Mbh |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
1023-5809 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000332337700017 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
360 |
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| Author |
Asenjo, F.A.; Hojman, S.A.; Moya-Cessa, H.M.; Soto-Eguibar, F. |
| Title |
Propagation of light in linear and quadratic GRIN media: The Bohm potential |
Type |
|
| Year |
2021 |
Publication |
Optics Communications |
Abbreviated Journal |
Opt. Commun. |
| Volume |
490 |
Issue |
|
Pages |
126947 |
| Keywords |
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| Abstract |
It is shown that field propagation in linear and quadratic gradient-index (GRIN) media obeys the same rules of free propagation in the sense that a field propagating in free space has a (mathematical) form that may be exported to those particular GRIN media. The Bohm potential is introduced in order to explain the reason of such behavior: it changes the dynamics by modifying the original potential . The concrete cases of two different initials conditions for each potential are analyzed. |
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Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0030-4018 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000664742700011 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1424 |
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| Author |
Asenjo, F.A.; Erices, C.; Gomberoff, A.; Hojman, S.A.; Montecinos, A. |
| Title |
Differential geometry approach to asymmetric transmission of light |
Type |
|
| Year |
2017 |
Publication |
Optics Express |
Abbreviated Journal |
Opt. Express |
| Volume |
25 |
Issue |
22 |
Pages |
26405-26416 |
| Keywords |
|
| Abstract |
In the last ten years, the technology of differential geometry, ubiquitous in gravitational physics, has found its place in the field of optics. It has been successfully used in the design of optical metamaterials through a technique now known as “transformation optics.” This method, however, only applies for the particular class of metamaterials known as impedance matched, that is, materials whose electric permittivity is equal to their magnetic permeability. In that case, the material may be described by a spacetime metric. In the present work we will introduce a generalization of the geometric methods of transformation optics to situations in which the material is not impedance matched. In such situations, the material -or more precisely, its constitutive tensor-will not be described by a metric only. We bring in a second tensor, with the local symmetries of the Weyl tensor, the “W-tensor.” In the geometric optics approximation we show how the properties of the W-tensor are related to the asymmetric transmission of the material. We apply this feature to the design of a particularly interesting set of asymmetric materials. These materials are birefringent when light rays approach the material in a given direction, but behave just like vacuum when the rays have the opposite direction with the appropriate polarization (or, in some cases, independently of the polarization). (C) 2017 Optical Society of America |
| Address |
[Asenjo, Felipe A.; Gomberoff, Andres] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Av Diagonal Torres 2640, Santiago, Chile, Email: andres.gomberoff@uai.cl |
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Thesis |
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| Publisher |
Optical Soc Amer |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
1094-4087 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000413995000004 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
798 |
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| Author |
Hojman, S.A.; Asenjo, F.A.; Moya-Cessa, H.M.; Soto-Eguibar, F. |
| Title |
Bohm potential is real and its effects are measurable |
Type |
|
| Year |
2021 |
Publication |
Optik |
Abbreviated Journal |
Optik |
| Volume |
232 |
Issue |
|
Pages |
166341 |
| Keywords |
Bohm potential; Non-vanishing; Accelerating solutions |
| Abstract |
We analyze Bohm potential effects both in the realms of Quantum Mechanics and Optics, as well as in the study of other physical phenomena described in terms of classical and quantum wave equations. We approach this subject by using theoretical arguments as well as experimental evidence. We find that the effects produced by Bohm potential are both theoretically responsible for the early success of Quantum Mechanics correctly describing atomic and nuclear phenomena and, more recently, by confirming surprising accelerating behavior of free waves and particles experimentally, for instance. |
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Place of Publication |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0030-4026 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000636139700002 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1366 |
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| Author |
Moya-Cessa, H.M.; Hojman, S.A.; Asenjo, F.A.; Soto-Eguibar, F. |
| Title |
Bohm approach to the Gouy phase shift |
Type |
|
| Year |
2022 |
Publication |
Optik |
Abbreviated Journal |
Optik |
| Volume |
252 |
Issue |
|
Pages |
168468 |
| Keywords |
Gouy phase; Bohm potential; Lewis-Ermakov invariant |
| Abstract |
By adapting the Madelung-Bohm formalism to paraxial wave propagation we show, by using Ermakov-Lewis techniques, that the Gouy phase is related to the form of the phase chosen in order to produce a Gaussian function as a propagated field. For this, we introduce a quantum mechanical invariant, that it is explicitly time dependent. We finally show that the effective Bohm index of refraction generates a GRIN medium that produces the focusing needed for the Gouy phase. |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0030-4026 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000756682400010 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1543 |
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| Author |
Qadir, A.; Asenjo, F.A.; Mahajan, S.M. |
| Title |
Magnetic field seed generation in plasmas around charged and rotating black holes |
Type |
|
| Year |
2014 |
Publication |
Physica Scripta |
Abbreviated Journal |
Phys. Scr. |
| Volume |
89 |
Issue |
8 |
Pages |
7 pp |
| Keywords |
seed magnetic field; general relativistic drive; Kerr metric |
| Abstract |
Previous work by the authors introduced the possibility of generating seed magnetic fields by spacetime curvature and applied it in the vicinity of a Schwarzschild black hole. It was pointed out that it would be worthwhile to consider the effect in other background geometries and particularly in the vicinity of a rotating black hole, which is generically to be expected, astrophysically. In this paper that suggestion is followed up and we calculate generated magnetic field seed due to Reissner-Nordstrom and Kerr spacetimes. The conditions for the drive for the seed of a magnetic field is obtained for charged black holes, finding that in the horizon the drive vanishes. Also, the psi N-force produced by the Kerr black hole is obtained and its relation with the magnetic field seed is discussed, producing a more effective drive. |
| Address |
[Qadir, Asghar] Natl Univ Sci & Technol, Ctr Adv Math & Phys, Islamabad 4400, Pakistan, Email: aqadirmath@yahoo.com |
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Thesis |
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| Publisher |
Iop Publishing Ltd |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0031-8949 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000343295000004 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
469 |
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| Author |
Asenjo, F.A.; Mahajan, S.M. |
| Title |
Relativistic quantum vorticity of the quadratic form of the Dirac equation |
Type |
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| Year |
2015 |
Publication |
Physica Scripta |
Abbreviated Journal |
Phys. Scr. |
| Volume |
90 |
Issue |
1 |
Pages |
4 pp |
| Keywords |
relativistic quantum mechanics; hydrodynamical version; Feynman-GellMann equation |
| Abstract |
We explore the fluid version of the quadratic form of the Dirac equation, sometimes called the Feynman-Gell-Mann equation. The dynamics of the quantum spinor field is represented by equations of motion for the fluid density, the velocity field, and the spin field. In analogy with classical relativistic and non-relativistic quantum theories, the fully relativistic fluid formulation of this equation allows a vortex dynamics. The vortical form is described by a total tensor field that is the weighted combination of the inertial, electromagnetic and quantum forces. The dynamics contrives the quadratic form of the Dirac equation as a total vorticity free system. |
| Address |
[Asenjo, Felipe A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: felipe.asenjo@uai.cl |
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Thesis |
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| Publisher |
Iop Publishing Ltd |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
0031-8949 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000349301500001 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
458 |
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| Author |
Hojman, S.A.; Asenjo, F.A. |
| Title |
Classical and Quantum Dispersion Relations |
Type |
|
| Year |
2020 |
Publication |
Physica Scripta |
Abbreviated Journal |
Phys. Scr. |
| Volume |
95 |
Issue |
8 |
Pages |
7 pp |
| Keywords |
Quantum Hamilton-Jacobi equation; Bohm potential; dispersion relation |
| Abstract |
It is showed that, in general, classical and quantum dispersion relations are different due to the presence of the Bohm potential. There are exact particular solutions of the quantum (wave) theory which obey the classical dispersion relation, but they differ in the general case. The dispersion relations may also coincide when additional assumptions are made, such as WKB or eikonal approximations, for instance. This general result also holds for non-quantum wave equations derived from classical counterparts, such as in ray and wave optics, for instance. Explicit examples are given for covariant scalar, vectorial and tensorial fields in flat and curved spacetimes. |
| Address |
[Hojman, Sergio A.] Univ Adolfo Ibanez, Fac Artes Liberales, Dept Ciencias, Santiago 7491169, Chile, Email: sergio.hojman@uai.cl; |
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Thesis |
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| Publisher |
Iop Publishing Ltd |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0031-8949 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000543208700001 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
1184 |
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| Author |
Hojman, S.J.; Moya-Cessa, H.M.; Soto-Eguibar, F.; Asenjo, F.A. |
| Title |
Time-dependent harmonic oscillators and SUSY in time domain |
Type |
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| Year |
2021 |
Publication |
Physica Scripta |
Abbreviated Journal |
Phys. Scr. |
| Volume |
96 |
Issue |
12 |
Pages |
125218 |
| Keywords |
time domain super-symmetry; time dependent harmonic oscillator; Bohm potential; Ermakov-lewis invariant |
| Abstract |
We show that the time-dependent harmonic oscillator has a repulsive or inverted oscillator as a time domain SUSY-like partner. Examples of several kinds of super-symmetrical time dependent frequency systems are presented. |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
0031-8949 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
WOS:000698808000001 |
Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1467 |
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| Author |
Hojmann, S.A.; Asenjo, F.A. |
| Title |
Quantum particles that behave as free classical particles |
Type |
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| Year |
2020 |
Publication |
PHYSICAL REVIEW A |
Abbreviated Journal |
Phys. Rev. A |
| Volume |
102 |
Issue |
5 |
Pages |
052211 |
| Keywords |
Wave; Generation |
| Abstract |
The existence of nonvanishing Bohm potentials, in the Madelung-Bohm version of the Schrödinger equation, allows for the construction of particular solutions for states of quantum particles interacting with nontrivial external potentials that propagate as free classical particles. Such solutions are constructed with phases which satisfy the classical Hamilton-Jacobi for free particles and whose probability densities propagate with constant velocity, as free classical particles do. |
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Abbreviated Series Title |
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Series Issue |
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Edition |
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| ISSN |
2469-9926 |
ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
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Approved |
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| Call Number |
UAI @ alexi.delcanto @ |
Serial |
1269 |
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| Author |
Hojman, S.A.; Asenjo, F.A. |
| Title |
Supersymmetric Majorana quantum cosmologies |
Type |
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| Year |
2015 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
| Volume |
92 |
Issue |
8 |
Pages |
7 pp |
| Keywords |
|
| Abstract |
The Einstein equations for an isotropic and homogeneous Friedmann-Robertson-Walker universe in the presence of a quintessence scalar field are shown to be described in a compact way, formally identical to the dynamics of a relativistic particle moving on a two-dimensional spacetime. The correct Lagrangian for the system is presented and used to construct a spinor quantum cosmology theory using Breit's prescription. The theory is supersymmetric when written in the Majorana representation. The spinor field components interact through a potential that correlates the spacetime metric and the quintessence. An exact supersymmetric solution for k = 0 case is exhibited. This quantum cosmology model may be interpreted as a theory of interacting universes. |
| Address |
[Hojman, Sergio A.] Univ Adolfo Ibanez, Dept Ciencias, Fac Artes Liberales, Santiago 7941169, Chile, Email: sergio.hojman@uai.cl; |
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Thesis |
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| Publisher |
Amer Physical Soc |
Place of Publication |
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| Language |
English |
Summary Language |
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Original Title |
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Series Issue |
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Edition |
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| ISSN |
2470-0010 |
ISBN |
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Conference |
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| Notes |
WOS:000362901900005 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
544 |
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| Author |
Hojman, S.A.; Asenjo, F.A. |
| Title |
Comment on “Highly relativistic spin-gravity coupling for fermions” |
Type |
|
| Year |
2016 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
| Volume |
93 |
Issue |
2 |
Pages |
4 pp |
| Keywords |
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| Abstract |
We exhibit difficulties of different sorts which appear when using the Mathisson-Papapetrou equations, in particular in the description of highly relativistic particles presented in R. Plyatsko and M. Fenyk [Phys. Rev. D 91, 064033 (2015)]. We compare some results of this theory and of the aforementioned work with the ones obtained using a Lagrangian formulation for massive spinning particles and show that the issues mentioned in the preceding sentence do not appear in the Lagrangian treatment. |
| Address |
[Hojman, Sergio A.] Univ Adolfo Ibanez, Fac Artes Liberales, Dept Ciencias, Santiago 7941169, Chile, Email: sergio.hojman@uai.cl; |
| Corporate Author |
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Thesis |
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| Publisher |
Amer Physical Soc |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2470-0010 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000369327900012 |
Approved |
|
| Call Number |
UAI @ eduardo.moreno @ |
Serial |
640 |
| Permanent link to this record |
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| Author |
Asenjo, F.A.; Hojman, S.A. |
| Title |
Birefringent light propagation on anisotropic cosmological backgrounds |
Type |
|
| Year |
2017 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
| Volume |
96 |
Issue |
4 |
Pages |
12 pp |
| Keywords |
|
| Abstract |
Exact electromagnetic wave solutions to Maxwell equations on anisotropic Bianchi I cosmological spacetime backgrounds are studied. The waves evolving on Bianchi I spacetimes exhibit birefringence (associated with linear polarization) and dispersion. The particular case of a vacuum-dominated anisotropic Universe, which reproduces a Friedmann-Robertson-Walker Universe (for late times)-while, for earlier times, it matches a Kasner Universe-is studied. The electromagnetic waves do not, in general, follow null geodesics. This produces a modification of the cosmological redshift, which is then dependent on light polarization, its dispersion, and its non-null geodesic behavior. New results presented here may help to tackle some issues related to the “horizon” problem. |
| Address |
[Asenjo, Felipe A.; Hojman, Sergio A.] Univ Adolfo Ibanez, UAI Phys Ctr, Santiago 7941169, Chile, Email: felipe.asenjo@uai.cl; |
| Corporate Author |
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Thesis |
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| Publisher |
Amer Physical Soc |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2470-0010 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000407716200007 |
Approved |
|
| Call Number |
UAI @ eduardo.moreno @ |
Serial |
756 |
| Permanent link to this record |
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| Author |
Comisso, L.; Asenjo, F.A. |
| Title |
Collisionless magnetic reconnection in curved spacetime and the effect of black hole rotation |
Type |
|
| Year |
2018 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
| Volume |
97 |
Issue |
4 |
Pages |
9 pp |
| Keywords |
|
| Abstract |
Magnetic reconnection in curved spacetime is studied by adopting a general-relativistic magneto-hydrodynamic model that retains collisionless effects for both electron-ion and pair plasmas. A simple generalization of the standard Sweet-Parker model allows us to obtain the first-order effects of the gravitational field of a rotating black hole. It is shown that the black hole rotation acts to increase the length of azimuthal reconnection layers, thus leading to a decrease of the reconnection rate. However, when coupled to collisionless thermal-inertial effects, the net reconnection rate is enhanced with respect to what would happen in a purely collisional plasma due to a broadening of the reconnection layer. These findings identify an underlying interaction between gravity and collisionless magnetic reconnection in the vicinity of compact objects. |
| Address |
[Comisso, Luca] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA, Email: lcomisso@princeton.edu; |
| Corporate Author |
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Thesis |
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| Publisher |
Amer Physical Soc |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2470-0010 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000424748300002 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
819 |
| Permanent link to this record |
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| Author |
Asenjo, F.A.; Comisso, L. |
| Title |
Magnetic connections in curved spacetime |
Type |
|
| Year |
2017 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
| Volume |
96 |
Issue |
12 |
Pages |
7 pp |
| Keywords |
|
| Abstract |
The ideal magnetohydrodynamic theorem on the conservation of the magnetic connections between plasma elements is generalized to relativistic plasmas in curved spacetime. The connections between plasma elements, which are established by a covariant connection equation, display a particularly complex structure in curved spacetime. Nevertheless, it is shown that these connections can be interpreted in terms of magnetic field lines alone by adopting a 3 + 1 foliation of spacetime. |
| Address |
[Asenjo, Felipe A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago 7941169, Chile, Email: felipe.asenjo@uai.cl; |
| Corporate Author |
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Thesis |
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| Publisher |
Amer Physical Soc |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2470-0010 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000417759400002 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
785 |
| Permanent link to this record |
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| Author |
Asenjo, F.A.; Comisso, L. |
| Title |
Gravitational electromotive force in magnetic reconnection around Schwarzschild black holes |
Type |
|
| Year |
2019 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
| Volume |
99 |
Issue |
6 |
Pages |
7 pp |
| Keywords |
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| Abstract |
We analytically explore the effects of the gravitational electromotive force on magnetic reconnection around Schwarzschild black holes through a generalized general-relativistic magnetohydrodynamic model that retains two-fluid effects. It is shown that the gravitational electromotive force can couple to collisionless two-fluid effects and drive magnetic reconnection. This is allowed by the departure from quasineutrality in curved spacetime, which is explicitly manifested as the emergence of an effective resistivity in Ohm's law. The departure from quasineutrality is owed to different gravitational pulls experienced by separate parts of the current layer. This produces an enhancement of the reconnecion rate due to purely gravitational effects. |
| Address |
[Asenjo, Felipe A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago 7941169, Chile, Email: felipe.asenjo@uai.cl; |
| Corporate Author |
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Thesis |
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| Publisher |
Amer Physical Soc |
Place of Publication |
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Editor |
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| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2470-0010 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000462917900001 |
Approved |
|
| Call Number |
UAI @ eduardo.moreno @ |
Serial |
993 |
| Permanent link to this record |
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| |
| Author |
Asenjo, F.A.; Mahajan, S.M. |
| Title |
Resonant interaction between dispersive gravitational waves and scalar massive particles |
Type |
|
| Year |
2020 |
Publication |
Physical Review D |
Abbreviated Journal |
Phys. Rev. D |
| Volume |
101 |
Issue |
6 |
Pages |
4 pp |
| Keywords |
|
| Abstract |
The Klein-Gordon equation is solved in the curved background spacetime created by a dispersive gravitational wave. Unlike solutions of perturbed Einstein equations in vacuum, dispersive gravitational waves do not travel exactly at the speed of light. As a consequence, the gravitational wave can resonantly exchange energy with scalar massive particles. Some details of the resonant interaction are displayed in a calculation demonstrating how relativistic particles (modeled by the Klein-Gordon equation), feeding on such gravitational waves, may be driven to extreme energies. |
| Address |
[Asenjo, Felipe A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago 7941169, Chile, Email: felipe.asenjo@uai.cl; |
| Corporate Author |
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Thesis |
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| Publisher |
Amer Physical Soc |
Place of Publication |
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Editor |
|
| Language |
English |
Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
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| Series Volume |
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Series Issue |
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Edition |
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| ISSN |
2470-0010 |
ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
WOS:000518819200001 |
Approved |
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| Call Number |
UAI @ eduardo.moreno @ |
Serial |
1160 |
| Permanent link to this record |
