https://doi.org/10.1140/epjc/s10052-020-8061-0
Regular Article - Theoretical Physics
Production of gravitational waves during preheating in the Starobinsky inflationary model
Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, 410081, Hunan, China
* e-mail: pxwu@hunnu.edu.cn
Received:
20
January
2020
Accepted:
20
May
2020
Published online:
1
June
2020
The production of GWs during preheating in the Starobinsky model with a nonminimally coupled auxiliary scalar field is studied through the lattice simulation in this paper. We find that the GW spectrum 
grows fast with the increase of the absolute value of coupling parameter 
. This is because the resonant bands become broad with the increase of 
. When 
, begins to grow once the inflation ends and grows faster than the case of 
. reaches the maximum at 
(
for the case ) and then decreases with slight oscillation. Furthermore we find that the GWs produced in the era of preheating satisfy the limits from the Planck and next-generation CMB experiments.
© The Author(s), 2020
