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Autor Beltrán Jiménez, José |
Documentos disponibles escritos por este autor (23)
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Beltrán Jiménez, José ; Ruiz Cembranos, José Alberto ; Sánchez Velázquez, José Manuel | Springer | 2018-05-15We consider theories for scalar and vector _elds coupled to the energymomentum tensor. Since these _elds also carry a non-trivial energy-momentum tensor, the coupling prescription generates self-interactions. In analogy with gravity theories, we[...]![]()
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Dark energy is usually parametrized as a perfect fliud with negative pressure and a certain equation of state. Besides, it is supposed to interact very weakly with the rest of the components of the universe and, as a consequence, there is no rea[...]![]()
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López Maroto, Antonio ; Beltrán Jiménez, José | Progress Theoretical Physics Publication Office | 2011In this work we consider quantum electromagnetic fields in an expanding universe. We start by reviewing the difficulties found when trying to impose the Lorenz condition in a time dependent geometry. Motivated by this fact, we explore the possib[...]![]()
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López Maroto, Antonio ; Beltrán Jiménez, José ; Koivisto, Tomi S. ; Fonseca Mota, David | IOP publishing ltd | 2009-10It has been recently proposed that the presence of a temporal electromagnetic field on cosmological scales could explain the phase of accelerated expansion that the universe is currently undergoing. The field contributes as a cosmological consta[...]![]()
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Nemes, Norbert Marcel ; Calderón, M. J. ; Beltrán Jiménez, José ; Bruno, F. Y. ; Garcia Barriocanal, Javier ; Sefrioui, Zouhair ; León Yebra, Carlos ; Gárcia Hernández, M. ; Muñoz, M. C. ; Brey, L. ; Santamaría Sánchez-Barriga, Jacobo | Wiley-V C H Verlag Gmbh | 2014-11-26The magnetoresistance of La0.7Sr0.3MnO3/SrTiO3La0.7Sr0.3MnO3/SrTiO3 superlattices with magnetic field rotating out-of-plane shows unexpected peaks for in-plane fields. Resistivity calculations with spin–orbit coupling reveal that orbital reconst[...]![]()
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Despite the success of Maxwell's electromagnetism in the description of the electromagnetic on small scales, we know very little about the behavior of electromagnetic fields on cosmological distances. Thus, it has been suggested recently that th[...]![]()
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We consider electromagnetic field quantization in an expanding universe We find that the covariant (Gupta Bleuler) method exhibits certain difficulties when trying to impose the quantum Lorenz condition on cosmological scales. We thus explore th[...]![]()
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López Maroto, Antonio ; Beltrán Jiménez, José ; Yepes Alonso, Gustavo ; Carlesi, Edoardo ; Knebe, Alexander | Oxford University Press | 2011-12The detection of extremely massive clusters at z > 1 such as SPT-CL J0546-5345, SPT-CL J2106-5844 and XMMU J2235.3 2557 has been considered by some authors as a challenge to the standard ? cold dark matter cosmology. In fact, assuming Gaussian [...]