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Author Armaza, C.; Hojman, S.A.; Koch, B.; Zalaquett, N. pdf  doi
openurl 
  Title On the possibility of non-geodesic motion of massless spinning tops Type
  Year 2016 Publication Classical And Quantum Gravity Abbreviated Journal Class. Quantum Gravity  
  Volume 33 Issue 14 Pages 18 pp  
  Keywords trajectory; massless; spin; curved spacetime  
  Abstract The motion of spinning massless particles in gravitationally curved backgrounds is revisited by considering new types of constraints. Those constraints guarantee zero mass (P μP μ= 0) and they allow for the possibility of trajectories which are not simply null geodesics. To exemplify this previously unknown possibility, the equations of motion are solved for radial motion in Schwarzschild background. It is found that the particle experiences a spin-induced energy shift, which is proportional to the Hawking temperature of the black hole background.  
  Address [Armaza, Cristobal; Koch, Benjamin; Zalaquett, Nicolas] Pontificia Univ Catolica Chile, Inst Fis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile, Email: nzalaquett@gmail.com  
  Corporate Author Thesis  
  Publisher Iop Publishing Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0264-9381 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000378895900012 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 636  
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Author Asenjo, F.A.; Hojman, S.A. pdf  doi
openurl 
  Title Do electromagnetic waves always propagate along null geodesics? Type
  Year 2017 Publication Classical And Quantum Gravity Abbreviated Journal Class. Quantum Gravity  
  Volume 34 Issue 20 Pages 12 pp  
  Keywords electromagnetic waves; curved spacetime; non-null geodesics  
  Abstract We find exact solutions to Maxwell equations written in terms of fourvector potentials in non-rotating, as well as in Gdel and Kerr spacetimes. We show that Maxwell equations can be reduced to two uncoupled secondorder differential equations for combinations of the components of the four-vector potential. Exact electromagnetic waves solutions are written on given gravitational field backgrounds where they evolve. We find that in non-rotating spherical symmetric spacetimes, electromagnetic waves travel along null geodesics. However, electromagnetic waves on Gdel and Kerr spacetimes do not exhibit that behavior.  
  Address [Asenjo, Felipe A.] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago, Chile, Email: felipe.asenjo@uai.cl;  
  Corporate Author Thesis  
  Publisher Iop Publishing Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0264-9381 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000411741800008 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 800  
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