Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 10, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2019/10/071
Keywords
cosmological perturbation theory; gravitational waves / sources; gravitational waves / theory; inflation
Funding
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- JSPS
- JSPS KAKENHI [JP18J12728, JP17H01131, JP17J00731]
- MEXT KAKENHI [JP15H05889, JP18H04594, JP19H05114]
- Advanced Leading Graduate Course for Photon Science
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We revisit the effects of an early matter-dominated era on gravitational waves induced by scalar perturbations. We carefully take into account the evolution of the gravitational potential, the source of these induced gravitational waves, during a gradual transition from an early matter-dominated era to the radiation-dominated era, where the transition timescale is comparable to the Hubble time at that time. Realizations of such a gradual transition include the standard perturbative reheating with a constant decay rate. Contrary to previous works, we find that the presence of an early matter-dominated era does not necessarily enhance the induced gravitational waves due to the decay of the gravitational potential around the transition from an early matter-dominated era to the radiation-dominated era.
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