Vacuum arbitrariness and the Hubble tension
High Energy Physics - Theory
2020-04-21 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
We show that the energy density of the superhorizon modes released in a non-Bunch-Davies vacuum can be arbitrarily large during inflation and it decreases like ln(a)/a^4 in the subsequent radiation dominated era. This may constitute a dark radiation component which can sufficiently alter the early cosmological evolution to alleviate the Hubble tension.
Cite
@article{arxiv.2004.01199,
title = {Vacuum arbitrariness and the Hubble tension},
author = {Ali Kaya},
journal= {arXiv preprint arXiv:2004.01199},
year = {2020}
}
Comments
18 pages, 2 figures, v2: references added