2026-06-07T18:59:13Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/60332023-08-27T12:13:06Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Cabral, Francisco
author
Lobo, Francisco S. N.
author
Rubiera García, Diego
2023-06-16T15:15:48Z
2023-06-16T15:15:48Z
2019-12
1434-6044
10.1140/epjc/s10052-019-7536-3
https://hdl.handle.net/20.500.14352/6033
http://dx.doi.org/10.1140/epjc/s10052-019-7536-3
https://link.springer.com/
Einstein-Cartan theory is an extension of the standard formulation of General Relativity where torsion (the antisymmetric part of the affine connection) is non-vanishing. Just as the space-time metric is sourced by the stress-energy tensor of the matter fields, torsion is sourced via the spin density tensor, whose physical effects become relevant at very high spin densities. In this work we introduce an extension of the Einstein-Cartan-Dirac theory with an electromagnetic (Maxwell) contribution minimally coupled to torsion. This contribution breaks the U(1) gauge symmetry, which is suggested by the possibility of a torsion-induced phase transition in the early Universe, yielding new physics in extreme (spin) density regimes. We obtain the generalized gravitational, electromagnetic and fermionic field equations for this theory, estimate the strength of the corrections, and discuss the corresponding phenomenology. In particular, we briefly address some astrophysical considerations regarding the relevance of the effects which might take place inside ultra-dense neutron stars with strong magnetic fields (magnetars).
eng
Atribución 3.0 España
Einstein-Cartan-Dirac gravity with U(1) symmetry breaking
journal article
URL
https://docta.ucm.es/bitstreams/e814cc49-fe85-43bb-903b-6f3d015d37b2/download
File
MD5
a093711c367a8925cdb216eb81fab8fa
416975
application/pdf
Rubiera, D 03 libre+CC.pdf