Large tensor-to-scalar ratio and low scale inflation

Details Large tensor-to-scalar ratio and low scale inflation Large tensor-to-scalar ratio and low scale inflation

2007-12-12

arxiv.org/abs/0712.2031v2

Astronomy and Astrophysics

Astrophysics

9 pages+8 figures; v2: small changes, added discussion, new figures

Scientific paper

It is plausible that the scalar density perturbations are created by a relatively low scale model of inflation which predicts the CMB anisotropy and excites Standard Model baryon and cold dark matter, but negligible gravity waves. Nevertheless a significantly large tensor perturbations can be observed if there exists a prior phase of high scale inflation separated by a matter or radiation dominated epoch. In this paper we provide a simple example when the gravity waves generated at high scales trickle through the horizon of the second phase of inflation and leave a distinct imprint in the spectrum of the tensor modes. For a high scale inflation occurring at $H\sim 10^{13}$ GeV while the second phase of inflation happening at $H\sim 1$ GeV, the largest tensor to scalar ratio is bounded by $r_{\rm observed}\leq0.8$.

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