Open AccessGravitational waves induced by scalar perturbations during a gradual transition from an early matter era to the radiation era
Author(s) -
Keisuke Inomata,
Kazunori Kohri,
Tomohiro Nakama,
Takahiro Terada
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1468/1/012001
Subject(s) - physics , gravitational wave , scalar (mathematics) , gravitation , gravitational constant , radiation , quantum electrodynamics , work (physics) , transition (genetics) , classical mechanics , astrophysics , quantum mechanics , chemistry , biochemistry , geometry , mathematics , gene
We revisit the effects of an early matter dominated era on gravitational waves induced by the scalar perturbations. In this work, we consider the gradual transition from an early matter dominated era to the radiation dominated era, where the time scale of the transition is comparable to the Hubble time at that time. The gradual transition can be realized by the standard perturbative reheating with a constant decay rate. We carefully take into account the evolutions of the perturbations during the gradual transition for the first time. As a result, we find that the induced gravitational waves can be suppressed contrary to the previous results.