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A simple parity violating model in the symmetric teleparallel gravity and its cosmological perturbations
- Source :
- Physics Letters
- Publication Year :
- 2022
- Publisher :
- Elsevier BV, 2022.
-
Abstract
- The parity violating gravity models based on the symmetric teleparallel gravity have been considered in the literature, but their applications in cosmology and especially the modifications to cosmological perturbations have not been fully explored. In this paper we consider such a simple model which modifies general relativity by a parity non-conserved coupling, within the framework of the symmetric teleparallel gravity. We study in detail its cosmological applications and focus on its cosmological perturbation theory. Besides the already known parity violation in the tensor perturbations, we find that the vector perturbations in this model are promoted to be dynamical degrees of freedom, and the left- and right-handed vector modes propagate with different velocities. More importantly, we find that one of the vector modes is a ghost at high momentum scales, which will give rise to the problem of vacuum instability in the quantum theory of cosmological perturbations.<br />13 pages, accepted for publication in PLB
- Subjects :
- High Energy Physics - Theory
General Relativity and Quantum Cosmology
Nuclear and High Energy Physics
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
High Energy Physics - Theory (hep-th)
FOS: Physical sciences
General Relativity and Quantum Cosmology (gr-qc)
Astrophysics - Cosmology and Nongalactic Astrophysics
Subjects
Details
- ISSN :
- 03702693
- Volume :
- 827
- Database :
- OpenAIRE
- Journal :
- Physics Letters B
- Accession number :
- edsair.doi.dedup.....b6ee7b2a6a052f966e335d784f460697