Detecting relics of a thermal gravitational wave background in the early Universe

Details Detecting relics of a thermal gravitational wave background in the early Universe Detecting relics of a thermal gravitational wave background in the early Universe

2009-07-24

arxiv.org/abs/0907.4303v3

Phys.Lett.B680:411-416,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 4 figures, published version

Scientific paper

10.1016/j.physletb.2009.09.018

A thermal gravitational wave background can be produced in the early Universe if a radiation dominated epoch precedes the usual inflationary stage. This background provides a unique way to study the initial state of the Universe. We discuss the imprint of this thermal spectra of gravitons on the cosmic microwave background (CMB) power spectra, and its possible detection by CMB observations. Assuming the inflationary stage is a pure de Sitter expansion we find that, if the number of e-folds of inflation is smaller than 65, the signal of this thermal spectrum can be detected by the observations of Planck and PolarBear experiments, or the planned EPIC experiments. This bound can be even looser if inflation-like stage is the sub-exponential.

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