TL;DR
This paper reviews recent cosmological solutions in the SME gravitational sector with explicit spacetime-symmetry breaking, highlighting how timelike diffeomorphism breaking modifies Friedmann equations and impacts primordial gravitational waves.
Contribution
It demonstrates that explicit symmetry breaking leads to standard cosmology with dynamical dark energy and explores implications for primordial gravitational waves.
Findings
Friedmann equations resemble standard FLRW with dark energy
Explicit symmetry breaking affects gravitational wave properties
Model provides new insights into early universe cosmology
Abstract
In this talk, we give a short overview of recent work on cosmological solutions within the SME gravitational sector under the assumption of explicit spacetime-symmetry breaking. We show that for the special case of timelike diffeomorphism breaking, the resulting Friedmann equations can be written as standard FLRW cosmology with added dynamical dark energy, and we discuss primordial gravitational waves in the context of this model.
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Taxonomy
TopicsCosmology and Gravitation Theories · Pulsars and Gravitational Waves Research · Radio Astronomy Observations and Technology