Kinematically Blocked Curvaton

Details Kinematically Blocked Curvaton Kinematically Blocked Curvaton

2011-05-19

arxiv.org/abs/1105.3801v4

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

6 pages, 2 figures, 2 tables; typos corrected, accepted for publication in MPLA

Scientific paper

In this paper, we investigate the idea that the decay of a curvaton is kinematically blocked and show that the coupling constant for curvaton decay can be as large as ${\cal O}(1)$. We also find in this case the lower bound of the Hubble parameter at horizon exit from big bang nucleosynthesis (BBN) is $H_\ast \gae 7.2 \times 10^{-9}M_P \sim 10^{10} {GeV}$. Similar to conventional curvaton scenario, the nonlinear parameter can be as large as $f_{NL}=100$.

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