AlzateGrisales, J. A., MoraRubio, A., GarcíaGarcía, F., TabaresSoto, R., & de la IglesiaVaya, M. (2023). SAMUNETR: Clinically Significant Prostate CanceSegmentation Using Transfer Learning From Large Model. IEEE Access, 11, 118217–118228.
Abstract: Prostate cancer (PCa) is one of the leading causes of cancerrelated mortality among men worldwide. Accurate and efficient segmentation of clinically significant prostate cancer (csPCa) regions from magnetic resonance imaging (MRI) plays a crucial role in diagnosis, treatment planning, and monitoring of the disease, however, this is a challenging task even for the specialized clinicians. This study presents SAMUNETR, a novel model for segmenting csPCa regions from MRI images. SAMUNETR combines a transformerencoder from the Segment Anything Model (SAM), a versatile segmentation model trained on 11 million images, with a residualconvolution decoder inspired by UNETR. The model uses multiple image modalities and applies prostate zone segmentation, normalization, and data augmentation as preprocessing steps. The performance of SAMUNETR is compared with three other models using the same strategy and preprocessing. The results show that SAMUNETR achieves superior reliability and accuracy in csPCa segmentation, especially when using transfer learning for the image encoder. This demonstrates the adaptability of largescale models for different tasks. SAMUNETR attains a Dice Score of 0.467 and an AUROC of 0.77 for csPCa prediction.

Asenjo, F. A., & Hojman, S. A. (2017). Do electromagnetic waves always propagate along null geodesics? Class. Quantum Gravity, 34(20), 12 pp.
Abstract: We find exact solutions to Maxwell equations written in terms of fourvector potentials in nonrotating, 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 fourvector potential. Exact electromagnetic waves solutions are written on given gravitational field backgrounds where they evolve. We find that in nonrotating spherical symmetric spacetimes, electromagnetic waves travel along null geodesics. However, electromagnetic waves on Gdel and Kerr spacetimes do not exhibit that behavior.

Asenjo, F. A., & Hojman, S. A. (2021). Reply to Comment on 'Do electromagnetic waves always propagate along null geodesics?' Reply. Class. Quantum Gravity, 38(23), 238002.
Abstract: A reply to the previous article commenting on nongeodesical propagation of electromagnetic fields on gravitational backgrounds and the eikonal limit are presented.

Asenjo, F. A., & Hojman, S. A. (2023). Timedomain supersymmetry for massless scalar and electromagnetic fields in anisotropic cosmologies. Phys. Scr., 98(10), 105302.
Abstract: It is shown that any cosmological anisotropic model produces supersymmetric theories for both massless scalar and electromagnetic (abelian) fields. This supersymmetric theory is the timedomain analogue of a supersymmetric quantum mechanics algebra theory. In this case, the variations of the anisotropic scale factors of the Universe are responsible for triggering the supersymmetry. For scalar fields, the superpartner fields evolve in two different cosmological scenarios (Universes). On the other hand, for propagating electromagnetic fields, supersymmetry is manifested through its polarization degrees of freedom in one Universe. In this case, polarization degrees of freedom of electromagnetic waves, which are orthogonal to its propagation direction, become superpartners from each other. This behavior can be measured, for example, through the rotation of the plane of polarization of cosmological light.

Asenjo, F. A., & Moya, P. S. (2019). The contribution of magnetic monopoles to the ponderomotive force. J. Phys. AMath. Theor., 52(25), 13 pp.
Abstract: When magnetic monopoles are assumed to exist in plasma dynamics, the propagation of electromagnetic waves is modified as Maxwell equations acquire a symmetrical structure due to the existence of electric and magnetic charge and current densities. This work presents a theoretical exploration on how far we can push the limits of a plasma theory under the presence of magnetic monopoles. In particular, we study the modification of ponderomotive forces in a plasma composed by electric and magnetic charges. We show that the general ponderomotive force on this plasma depends nontrivially on the magnetic monopoles, through the slow temporal and spatial variations of the electromagnetic field amplitudes. The magnetic charges introduce corrections even if the plasma is unmagnetized. Also, it is shown that the magnetic monopoles also experience a ponderomotive force due to the electrons. This force is in the direction of propagation of the electromagnetic waves.

Aylwin, R., JerezHanckes, C., Schwab, C., & Zech, J. (2020). Domain Uncertainty Quantification in Computational Electromagnetics. SIAMASA J. Uncertain. Quantif., 8(1), 301–341.
Abstract: We study the numerical approximation of timeharmonic, electromagnetic fields inside a lossy cavity of uncertain geometry. Key assumptions are a possibly highdimensional parametrization of the uncertain geometry along with a suitable transformation to a fixed, nominal domain. This uncertainty parametrization results in families of countably parametric, Maxwelllike cavity problems that are posed in a single domain, with inhomogeneous coefficients that possess finite, possibly low spatial regularity, but exhibit holomorphic parametric dependence in the differential operator. Our computational scheme is composed of a sparse grid interpolation in the highdimensional parameter domain and an Hcurl conforming edge element discretization of the parametric problem in the nominal domain. As a steppingstone in the analysis, we derive a novel Strangtype lemma for Maxwelllike problems in the nominal domain, which is of independent interest. Moreover, we accommodate arbitrary small Sobolev regularity of the electric field and also cover uncertain isotropic constitutive or material laws. The shape holomorphy and edgeelement consistency error analysis for the nominal problem are shown to imply convergence rates for multilevel Monte Carlo and for quasiMonte Carlo integration, as well as sparse grid approximations, in uncertainty quantification for computational electromagnetics. They also imply expression rate estimates for deep ReLU networks of shapetosolution maps in this setting. Finally, our computational experiments confirm the presented theoretical results.

CaceresVasquez, J., Jara, D. H., Costamagna, J., MartinezGomez, F., Silva, C. P., Lemus, L., et al. (2023). Effect of noncovalent selfdimerization on the spectroscopic and electrochemical properties of mixed Cu(i) complexes. RSC Advances, 13(2), 825–838.
Abstract: A series of six new Cu(i) complexes with ([Cu(N{4R}pyridine2ylmethanimine)(PPh3)Br]) formulation, where R corresponds to a donor or acceptor psubstituent, have been synthesized and were used to study selfassociation effects on their structural and electrochemical properties. Xray diffraction results showed that in all complexes the packing is organized from a dimer generated by supramolecular pi stacking and hydrogen bonding. H1NMR experiments at several concentrations showed that all complexes undergo a fastselfassociation monomerdimer equilibrium in solution, while changes in resonance frequency towards the high or low field in specific protons of the imine ligand allow establishing that dimers have similar structures to those found in the crystal. The thermodynamic parameters for this selfassociation process were calculated from dimerization constants determined by VTH1NMR experiments for several concentrations at different temperatures. The values for KD (4.0 to 70.0 M1 range), Delta H (1.4 to 2.6 kcal mol(1) range), Delta S (0.2 to 2.1 cal mol(1) K1 range), and Delta G(298) (0.8 to 2.0 kcal mol(1) range) are of the same order and indicate that the selfdimerization process is enthalpically driven for all complexes. The electrochemical profile of the complexes shows two redox Cu(ii)/Cu(i) processes whose relative intensities are sensitive to concentration changes, indicating that both species are in chemical equilibrium, with the monomer and the dimer having different electrochemical characteristics. We associate this behaviour with the structural lability of the Cu(i) centre that allows the monomeric molecules to reorder conformationally to achieve a more adequate assembly in the noncovalent dimer. As expected, structural properties in the solid and in solution, as well as their electrochemical properties, are not correlated with the electronic parameters usually used to evaluate R substituent effects. This confirms that the properties of the Cu(i) complexes are usually more influenced by steric effects than by the inductive effects of substituents of the ligands. In fact, the results obtained showed the importance of noncovalent inte

Cisternas, J., Mellado, P., Urbina, F., Portilla, C., Carrasco, M., & Concha, A. (2021). Stable and unstable trajectories in a dipolar chain. Phys. Rev. B, 103(13), 134443.
Abstract: In classical mechanics, solutions can be classified according to their stability. Each of them is part of the possible trajectories of the system. However, the signatures of unstable solutions are hard to observe in an experiment, and most of the times if the experimental realization is adiabatic, they are considered just a nuisance. Here we use a small number of XY magnetic dipoles subject to an external magnetic field for studying the origin of their collective magnetic response. Using bifurcation theory we have found all the possible solutions being stable or unstable, and explored how those solutions are naturally connected by points where the symmetries of the system are lost or restored. Unstable solutions that reveal the symmetries of the system are found to be the culprit that shape hysteresis loops in this system. The complexity of the solutions for the nonlinear dynamics is analyzed using the concept of boundary basin entropy, finding that the damping timescale is critical for the emergence of fractal structures in the basins of attraction. Furthermore, we numerically found domain wall solutions that are the smallest possible realizations of transverse walls and vortex walls in magnetism. We experimentally confirmed their existence and stability showing that our system is a suitable platform to study domain wall dynamics at the macroscale.

Hobson, M. J., Trifonov, T., Henning, T., Jordan, A., Rojas, F., Espinoza, N., et al. (2023). Alert Results TOI199 b: A Wellcharacterized 100 day Transiting Warm Giant Planet with TTVs Seen from Antarctica 41 of 41 TOI199 b: A Wellcharacterized 100 day Transiting Warm Giant Planet with TTVs Seen from Antarctica. Astron. J., 166(5), 201.
Abstract: We present the spectroscopic confirmation and precise mass measurement of the warm giant planet TOI199 b. This planet was first identified in TESS photometry and confirmed using groundbased photometry from ASTEP in Antarctica including a full 6.5 hr long transit, PEST, Hazelwood, and LCO; space photometry from NEOSSat; and radial velocities (RVs) from FEROS, HARPS, CORALIE, and CHIRON. Orbiting a late Gtype star, TOI199 b has a 104.8540.002+0.001day period, a mass of 0.17 +/ 0.02 M J, and a radius of 0.810 +/ 0.005 R J. It is the first warm exoSaturn with a precisely determined mass and radius. The TESS and ASTEP transits show strong transit timing variations (TTVs), pointing to the existence of a second planet in the system. The joint analysis of the RVs and TTVs provides a unique solution for the nontransiting companion TOI199 c, which has a period of 273.690.22+0.26days and an estimated mass of 0.280.01+0.02MJ . This period places it within the conservative habitable zone.

Hobson, M. J., Brahm, R., Jordan, A.., Espinoza, N., Kossakowski, D., Henning, T., et al. (2021). A Transiting Warm Giant Planet around the Young Active Star TOI201. Astron. J., 161(5), 235.
Abstract: We present the confirmation of the eccentric warm giant planet TOI201 b, first identified as a candidate in Transiting Exoplanet Survey Satellite photometry (Sectors 18, 1013, and 2728) and confirmed using groundbased photometry from Next Generation Transit Survey and radial velocities from FEROS, HARPS, CORALIE, and MINERVAAustralis. TOI201 b orbits a young (0.87(0.49)(+0.46)) and bright (V = 9.07 mag) Ftype star with a 52.9781 day period. The planet has a mass of 0.42(0.03)(+0.05) MJ, a radius of 1.008(0.015)(+0.012) RJ, and an orbital eccentricity of 0.28(0.09)(+0.06); it appears to still be undergoing fairly rapid cooling, as expected given the youth of the host star. The star also shows longterm variability in both the radial velocities and several activity indicators, which we attribute to stellar activity. The discovery and characterization of warm giant planets such as TOI201 b are important for constraining formation and evolution theories for giant planets.

Kleanthous, A., Betcke, T., Hewett, D. P., EscapilInchauspe, P., JerezHanckes, C., & Baran, A. J. (2022). Accelerated Calderon preconditioning for Maxwell transmission problems. J. Comput. Phys., 458, 111099.
Abstract: We investigate a range of techniques for the acceleration of Calderon (operator) preconditioning in the context of boundary integral equation methods for electromagnetic transmission problems. Our objective is to mitigate as far as possible the high computational cost of the barycentricallyrefined meshes necessary for the stable discretisation of operator products. Our focus is on the wellknown PMCHWT formulation, but the techniques we introduce can be applied generically. By using barycentric meshes only for the preconditioner and not for the original boundary integral operator, we achieve significant reductions in computational cost by (i) using “reduced” Calderon preconditioners obtained by discarding constituent boundary integral operators that are not essential for regularisation, and (ii) adopting a “biparametric” approach [1,2] in which we use a lower quality (cheaper) Hmatrix assembly routine for the preconditioner than for the original operator, including a novel approach of discarding farfield interactions in the preconditioner. Using the boundary element software Bempp (www.bempp.com), we compare the performance of different combinations of these techniques in the context of scattering by multiple dielectric particles. Applying our accelerated implementation to 3D electromagnetic scattering by an aggregate consisting of 8 monomer ice crystals of overall diameter 1cm at 664GHz leads to a 99% reduction in memory cost and at least a 75% reduction in total computation time compared to a nonaccelerated implementation. Crown Copyright (C) 2022 Published by Elsevier Inc. All rights reserved.

Mahajan, S. M., Asenjo, F. A., & Hazeltine, R. D. (2015). Comparison of the electronspin force and radiation reaction force. Mon. Not. Roy. Astron. Soc., 446(4), 4112–4115.
Abstract: It is shown that the forces that originate from the electronspin 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 highfrequency radiation, a situation that pertains to both laserproduced 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 particleincell codes), therefore, is a must.

Qadir, A., Asenjo, F. A., & Mahajan, S. M. (2014). Magnetic field seed generation in plasmas around charged and rotating black holes. Phys. Scr., 89(8), 7 pp.
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 ReissnerNordstrom 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 Nforce produced by the Kerr black hole is obtained and its relation with the magnetic field seed is discussed, producing a more effective drive.

Rao, B. V. B., Jena, M., Aepuru, R., Udayabhaskar, R., Mangalaraja, R. V., EspinozaGonzalez, R., et al. (2022). Superior electromagnetic wave absorption performance of Fe3O4 modified graphene assembled porous carbon (mGAPC) based hybrid foam. Mater. Chem. Phys., 290, 126512.
Abstract: High performance Fe3O4 modified graphene assembled porous carbon (mGAPC) based epoxy paint coated on Polyethylene (PE) foam is realized by spray technique to fabricate light weight electromagnetic absorbers. The mGAPC as a pigment in a standard composition of commercial paint was optimized and the influence of solvent and additives are studied to achieve Xband (8.212.4 GHz) electromagnetic wave absorption (EA) in the hybrid foam (HF). From the comparative studies, the hybrid foams obtained from epoxy paint with toluene as solvent (without Mnoctate as additive) showed a Reflection Loss (RL) 19 dB (in the range of 8.38.7 GHz), which was further increased with the coating cycles up to 43 dB (in 10.211.2 GHz).The observed rise is attributed to increase in localized interfacial polarization that arises at the combined interfaces of mGAPC. The result showed 99% loss, which projects a promising EA paint for practical applications. Further thickness dependent studies of EA in Paint Coat HF1, reveals that with increasing thickness from 0.3 to 2 mm, the RL also increases from 19 to 43 dB with changing absorption band. The superior EA properties are correlated to the percolation threshold, pigment dispersibility and further correlated to the strong absorption, destructive interference, multiple internal reflections and interfacial polarization of the radiation in the hybrid foam. Moreover, considering the paint lowest thickness similar to 0.3 mm with 19 dB of RL, the hybrid foam promises a costeffective, fine, lightweight EA/ RL material for secure electronic devices and packaging in civil and defence applications.

Saji, C., Troncoso, R. E., CarvalhoSantos, V. L., Altbir, D., & Nunez, A. S. (2023). HopfionDriven Magnonic Hall Effect and Magnonic Focusing. Phys. Rev. Lett., 131(16), 166702.
Abstract: Hopfions are localized and topologically nontrivial magnetic configurations that have received considerable attention in recent years. In this Letter, we use a micromagnetic approach to analyze the scattering of spin waves (SWs) by magnetic hopfions. Our results evidence that SWs experience an electromagnetic field generated by the hopfion and sharing its topological properties. In addition, SWs propagating along the hopfion symmetry axis are deflected by the magnetic texture, which acts as a convergent or divergent lens, depending on the SWs' propagation direction. Assuming that SWs propagate along the plane perpendicular to the symmetry axis, the scattering is closely related to the AharonovBohm effect, allowing us to identify the magnetic hopfion as a scattering center.

TapiaBelmonte, F., Concha, A., & Poupin, M. J. (2023). The Effects of Uniform and Nonuniform Magnetic Fields in Plant Growth: A MetaAnalysis Approach. Bioelectromagnetics, Early Access.
Abstract: Magnetic field (MF) effects have been reported in plants' growth, seed germination, gene expression, and water consumption. Accordingly, magnetic treatments have been proposed as a sustainable alternative to improve yields. Nevertheless, a comprehensive quantitative assessment is needed to understand whether their effects are general, speciesspecific, or dependent on the experimental setting. We conducted a multilevel metaanalysis of 45 articles that studied 29 different plant species. A positive and neutral effect of a nonuniform MF was found on fresh weight and germination rate, respectively. A significant association was found between a uniform MF and germination. These results suggest that MFs improve plant growth. However, the effects are highly dependent on the experimental setting. This opens exciting questions about the biophysical mechanisms underlying the perception and transduction of this environmental cue and about the possible translation to agricultural practices

Thandapani, P., Aepuru, R., Beron, F., Mangalaraja, R. V., Varaprasad, K., Zabotto, F. L., et al. (2023). Multiferroic Electroactive Polymer Blend/Ferrite Nanocomposite Flexible Films for Cooling Devices. ACS Appl. Polym. Mater., 5(8), 5926–5936.
Abstract: In recent days, the interest toward the development ofmulticaloricmaterials for cooling application is increasing, whereas multiferroicmaterials would be the suitable alternative to the conventional refrigerants.To explore them, the poly(methyl methacrylate)/poly(vinylidenefluoridecohexafluoropropylene) (PMMA/PVDFHFP) blend and PMMA/PVDFHFP/Zn0.5Cu0.5Fe2O4 flexible multiferroicnanocomposite films were fabricated by the solution casting method.The structural analyses prove that the strong interfacial interactionbetween the PMMA/PVDFHFP blend and the Zn0.5Cu0.5Fe2O4 (ZCF) through hydroxyl (OH) andcarbonyl group bonding with PVDFHFP enhanced the thermal stabilityand suppressed the electroactive & beta; phase from 67 to 62%. Experimentalresults show that 10 wt % of superparamagnetic ZCF nanoparticles witha particle size of 6.8 nm induced both the magnetocaloric and magnetoelectriceffects in a nonmagnetic PMMA/PVDFHFP ferroelectric matrix at roomtemperature. A set of isothermal magnetization curves were recordedin the magnetic field strength of 040 kOe and a temperaturerange of 2400 K. The maximum magnetic entropy changes (& UDelta;S (M)) of 0.69 J & BULL;kg(1) K1 of ZCF nanoparticles and 0.094 J & BULL;kg(1) K1 of PMMA/PVDFHFP/ZCF nanocompositesshowed an interesting tablelike flat variation in the temperaturerange of 100400 K as a function of the magnetic field. Thesamples display a large temperature span with a relative cooling power of 293 and 40 J & BULL;kg(1) for ZCF and PMMA/PVDFHFP/ZCF,respectively. The magnetoelectric effect of the PMMA/PVDFHFP/ZCFcomposite was proved, but it generated only 1.42 mV/m & BULL;Oe in theapplied field of 5 kOe. Hence, the entropy change of the present nanocompositewas only due to the magnetocaloric effect, where the magnetoelectriccrosscoupling coefficient was negligible. The multicaloric effectcould be established if the nanocomposite showed a larger magnetoelectriccrosscoupling in addition to the magnetocaloric effect. This approachprovides the research findings in functional multiferroic polymernanocomposites for miniaturized cooling devices.

Urbina, F., Franco, A. F., & Concha, A. (2022). Frequency dynamics of a chain of magnetized rotors: dumbbell model vs LandauLifshitz equation. J. Phys. Condens. Matter, 34(48), 485801.
Abstract: During the past decades magnetic materials and structures that span several length scales have been of interest mainly due to their application in data storage and processing, flexible electronics, medicine, between others. From a microscopic point of view, these systems are typically studied using the LandauLifshitz equation (LLE), while approaches such as the dumbbell model are used to study macroscopic magnetic structures. In this work we use both the LLE and the dumbbell model to study spin chains of various lengths under the effect of a time dependentmagnetic field, allowing us to compare qualitatively the results obtained by both approaches. This has allowed us to identify and describe in detail several frequency modes that appear, with additional modes arising as the chain length increases. Moreover, we find that high frequency modes tend to be absorbed by lower frequency ones as the amplitude of the field increases. The results obtained in this work are of interest not only to better understand the behavior of the macroscopic spins chains, but also expands the available tools for qualitative studies of both macroscopic and microscopic versions of the studied system, or more complex structures such as junctions or lattices. This would allow to study the qualitative behavior of microscopic systems (e.g. nanoparticles) using macroscopic arrays of magnets, and vice versa.
