Quantum backreaction on a classical universe
Abstract
We study a first-order formulation for the coupled evolution of a quantum scalar field and a classical Friedmann universe. The model is defined by a state dependent hamiltonian constraint and the time dependent Schr\"odinger equation for the scalar field. We solve the resulting non-linear equations numerically for initial data consisting of a Gaussian scalar field state and gravity phase space variables. This gives a self-consistent semiclassical evolution that includes non-perturbative ``backreaction" due to particle production. We compare the results with the evolution of a quantum scalar field on a fixed background, and find that the backreaction modifies both particle production and cosmological expansion, and that these effects remain bounded.
Cite
@article{arxiv.2109.12752,
title = {Quantum backreaction on a classical universe},
author = {Viqar Husain and Suprit Singh},
journal= {arXiv preprint arXiv:2109.12752},
year = {2021}
}
Comments
7 pages, 2 figures