@Article{Nadal-Gisbert_etal2023,
author="Nadal-Gisbert, S.
and Navarro-Salas, J.
and Pla, S.",
title="Low-energy states and CPT invariance at the big bang",
journal="Physical Review D",
year="2023",
publisher="Amer Physical Soc",
volume="107",
number="8",
pages="085018--16pp",
abstract="In this paper, we analyze the quantum vacuum in a radiation-dominated and CPT -invariant universe by further imposing the quantum states to be ultraviolet regular i.e., satisfying the Hadamard/adiabatic condition. For scalar fields, this is enforced by constructing the vacuum via the states of low-energy proposal. For spin -12 fields, we extend this proposal for a FLRW spacetime and apply it for the radiation-dominated and CPT -invariant universe. We focus on minimizing the smeared energy density around the big bang and give strong evidence that the resulting states satisfy the Hadamard/adiabatic condition. These states are then self -consistent candidates as effective big bang quantum vacuum from the field theory perspective.",
optnote="WOS:000981997800003",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5585), last updated on Wed, 02 Aug 2023 07:21:50 +0000",
issn="2470-0010",
doi="10.1103/PhysRevD.107.085018",
opturl="https://arxiv.org/abs/2302.08812",
opturl="https://doi.org/10.1103/PhysRevD.107.085018",
language="English"
}