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      Reheating mechanism of Curvaton with Nonminimal Derivative Coupling to Gravity

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          Abstract

          In this paper, we continue our study on the curvaton model with nonminimal derivative coupling (NDC) to Einstein gravity proposed in our previous work, focusing on the reheating mechanism. We found that according to whether the curvaton has dominated the background after the end of inflation, it will have two different behaviors of evolution, which should be the general property of curvaton with nonminimal couplings. This will cause diffferent rates of particle creation, which goes on via the parametric resonance process. The reheating temperature is estimated for both cases in which reheating completes before and after curvaton domination, and the constraints are quite loose compared to that of overproduction of gravitino. Finally we investigated the evolution of curvature perturbation during reheating. We have shown both analytically and numerically that the curvature perturbation will not blow up during the resonance process.

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          Author and article information

          Journal
          2016-08-04
          Article
          1608.01752
          619c2f61-ce96-4c41-b47a-ce280a4bc6a2

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          hep-ph astro-ph.CO gr-qc hep-th

          Cosmology & Extragalactic astrophysics,General relativity & Quantum cosmology,High energy & Particle physics

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