Thermal gravitons from the Gibbons-Hawking bath at the end of inflation are predicted to yield a MHz-band relic gravitational wave background with Ω_GW h^2 around 10^-18.
Our Universe from the cosmological constant
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abstract
In this article, we consider a bouncing Universe, as described for example by Loop Quantum Cosmology. If the current acceleration is due to a true cosmological constant, this constant is naturally conserved through the bounce and the Universe should also be in a (contracting) de Sitter phase in the remote past. We investigate here the possibility that the de Sitter temperature in the contracting branch fills the Universe with radiation and causes the bounce and the subsequent inflation and reheating. We also consider the possibility that this gives rise to a cyclic model of the Universe and suggest some possible tests.
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High-Frequency Thermal Graviton Remnant from the End of Inflation
Thermal gravitons from the Gibbons-Hawking bath at the end of inflation are predicted to yield a MHz-band relic gravitational wave background with Ω_GW h^2 around 10^-18.