Low-energy states and C P T invariance at the big bang
Abstract
In this paper, we analyze the quantum vacuum in a radiation-dominated and C P T -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-1/2 fields, we extend this proposal for a FLRW spacetime and apply it for the radiation-dominated and C P T -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.
- Publication:
-
Physical Review D
- Pub Date:
- April 2023
- DOI:
- 10.1103/PhysRevD.107.085018
- arXiv:
- arXiv:2302.08812
- Bibcode:
- 2023PhRvD.107h5018N
- Keywords:
-
- General Relativity and Quantum Cosmology;
- High Energy Physics - Theory
- E-Print:
- 21 pages. PRD version