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2015

Gravitational Effects on Inflaton Decay

Ema, Yohei, Jinno, Ryusuke, Mukaida, Kyohei et al.

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We point out that the inflaton inevitably couples to all non-conformally coupled matters gravitationally through an oscillation in the Hubble parameter or the cosmic scale factor.

It leads to particle production during the inflaton oscillation regime, which is most efficient just after inflation.
Moreover, the analysis is extended to the model with non-minimal inflaton couplings to gravity, in which the Hubble parameter oscillates more violently.
We apply our results to the graviton production by the inflaton: gravitons are also produced just after inflation, but the non-minimal coupling does not induce inflaton decay into the graviton pair.

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