2026-06-27T15:45:40Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/66792023-08-25T10:21:45Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Cabral, Francisco
author
Lobo, Francisco S. N.
author
Rubiera García, Diego
2023-06-16T15:26:28Z
2023-06-16T15:26:28Z
2020-10-06
1550-7998
10.1103/PhysRevD.102.083509
https://hdl.handle.net/20.500.14352/6679
http://dx.doi.org/10.1103/PhysRevD.102.083509
https://journals.aps.org/
Einstein-Cartan theory is an extension of the standard formulation of general relativity characterized by a nonvanishing torsion. The latter is sourced by the matter fields via the spin tensor, and its effects are expected to be important at very high spin densities. In this work, we analyze in detail the physics of Einstein-Cartan theory with Dirac and Maxwell fields minimally coupled to the spacetime torsion. This breaks the U(1) gauge symmetry, which is suggested by the possibility of a torsion-induced phase transition in the early Universe. The resulting Dirac-like and Maxwell-like equations are nonlinear with self-interactions as well as having fermion-boson nonminimal couplings. We discuss several cosmological aspects of this theory under the assumption of randomly oriented spin densities (unpolarized matter), including bounces, acceleration phases, and matter-antimatter asymmetry in the torsion era, as well as late-time effects such as the generation of an effective cosmological constant, dark energy, and future bounces within cyclic solutions.
eng
Atribución 3.0 España
Cosmological bounces, cyclic universes, and effective cosmological constant in Einstein-Cartan-Dirac-Maxwell theory
journal article
URL
https://docta.ucm.es/bitstreams/e10e6417-4704-47dd-9f23-fc726c6202bc/download
File
MD5
7a51920469ee9639f918f85348ecdd8a
425721
application/pdf
Rubiera, D 11 libre+CC.pdf