States of Low Energy on Robertson-Walker Spacetimes
General Relativity and Quantum Cosmology
2008-11-26 v2
Abstract
We construct a new class of physical states of the free Klein-Gordon field in Robertson-Walker spacetimes. This is done by minimizing the expectation value of smeared stress-energy. We get an explicit expression for the state depending on the smearing function. We call it a state of low energy. States of low energy are an improvement of the concept of adiabatic vacua on Robertson-Walker spacetimes. The latter are approximations of the former. It is shown that states of low energy are Hadamard states.
Keywords
Cite
@article{arxiv.0704.2986,
title = {States of Low Energy on Robertson-Walker Spacetimes},
author = {Heiner Olbermann},
journal= {arXiv preprint arXiv:0704.2986},
year = {2008}
}
Comments
24 pages, minor changes, acknoledgements added