States of Low Energy on Robertson-Walker Spacetimes

Details States of Low Energy on Robertson-Walker Spacetimes States of Low Energy on Robertson-Walker Spacetimes

2007-04-23

arxiv.org/abs/0704.2986v2

Class.Quant.Grav.24:5011-5030,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

24 pages, minor changes, acknoledgements added

Scientific paper

10.1088/0264-9381/24/20/007

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.

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