https://doi.org/10.1140/epjc/s10052-017-5275-x
Regular Article - Theoretical Physics
Reheating mechanism of the curvaton with nonminimal derivative coupling to gravity
1
Institute of Astrophysics, Central China Normal University, Wuhan, 430079, People’s Republic of China
2
Key Laboratory of Quark and Lepton Physics (MOE) and College of Physical Science and Technology, Central China Normal University, Wuhan, 430079, People’s Republic of China
3
Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China
* e-mail: qiutt@mail.ccnu.edu.cn
Received:
4
April
2017
Accepted:
2
October
2017
Published online:
17
October
2017
In this paper, we continue our study of the curvaton model with nonminimal derivative coupling (NDC) to Einstein gravity proposed in our previous work (Feng in Phys Lett B 729:99, 2014; Feng and Qiu in Phys Rev D 90(12):123508, 2014), focusing on the reheating mechanism. We found that according to whether the curvaton has or has not dominated the background after the end of inflation, it will have two different behaviors of evolution, which should be the general property of the curvaton with nonminimal couplings. This will cause two different parts of reheating, 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 gravitinos. 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.
© The Author(s), 2017
