Graviton production in non-inflationary cosmology

Details Graviton production in non-inflationary cosmology Graviton production in non-inflationary cosmology

2009-01-06

arxiv.org/abs/0901.0650v2

Phys.Rev.D79:063507,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages 2 figure extended version accepted for publication in PRD

Scientific paper

10.1103/PhysRevD.79.063507

We discuss the creation of massless particles in a Universe, which transits from a radiation-dominated era to any other expansion law. We calculate in detail the generation of gravitons during the transition to a matter dominated era. We show that the resulting gravitons generated in the standard radiation/matter transition are negligible. We use our result to constrain one or more previous matter dominated era, or any other expansion law, which may have taken place in the early Universe. We also derive a general formula for the modification of a generic initial graviton spectrum by an early matter dominated era.

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