``Natural'' Vacua in Hyperbolic Friedmann-Robertson-Walker Spacetimes

Details ``Natural'' Vacua in Hyperbolic Friedmann-Robertson-Walker Spacetimes ``Natural'' Vacua in Hyperbolic Friedmann-Robertson-Walker Spacetimes

1999-04-30

arxiv.org/abs/gr-qc/9904084v1

Phys.Rev. D60 (1999) 104004

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

7 pages, 0 figures

Scientific paper

10.1103/PhysRevD.60.104004

Recent evidence indicates that the Universe is open, i.e., spatially hyperbolic, longstanding theoretical preferences to the contrary notwithstanding. This makes it possible to select a vacuum state, Fock space, and particle definition for a quantized field, by requiring concordance with ordinary flat-spacetime theory at late times. The particle-number basis states thus identified span the physical state space of the field at all times. This construction is demonstrated here explicitly for a massive, minimally coupled, linear scalar field in an open, radiation-dominated Friedmann-Robertson-Walker spacetime.

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