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Paper detail

On adiabatic invariant in generalized Galileon theories

We consider background dynamics of generalized Galileon theories in the context of inflation, where gravity and inflaton are non-minimally coupled to each other. In the inflaton oscillation regime, the Hubble parameter and energy density oscillate violently in many cases, in contrast to the Einstein gravity with minimally coupled inflaton. However, we find that there is an adiabatic invariant in the inflaton oscillation regime in any generalized Galileon theory. This adiabatic invariant is useful in estimating the expansion law of the universe and also the particle production rate due to the oscillation of the Hubble parameter.

preprint2015arXivOpen access
Yohei EmaRyusuke JinnoKyohei MukaidaKazunori Nakayama
astro-ph.COhep-phgr-qc
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Yohei EmaRyusuke JinnoKyohei MukaidaKazunori Nakayama

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