Detecting relics of a thermal gravitational wave background in the early Universe
arXiv:0907.4303 · doi:10.1016/j.physletb.2009.09.018
Abstract
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.
9 pages, 4 figures, published version
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- B-mode Power Spectrum of CMB via Polarized Compton Scattering
- Thermal gravitational-wave background in the general pre-inflationary scenario
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- Detection relic gravitational waves in thermal case by using Adv.LIGO data of GW150914
- Secondary graviton spectra, second-order correlations and Bose-Einstein enhancement
- Lowering tensor-to-scalar ratio by pre-inflationary dynamics
- VSL-Gravity in light of PSR B1913+16 Full Data Set: Upper limits on graviton mass and its theoretical consequences
- Slow roll inflation and BB mode angular power spectrum of CMB