Gravitational waves induced by scalar perturbations during a gradual transition from an early matter era to the radiation era

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...

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Veröffentlicht in:Journal of cosmology and astroparticle physics 2019-10, Vol.2019 (10), p.71-71
Hauptverfasser: Inomata, Keisuke, Kohri, Kazunori, Nakama, Tomohiro, Terada, Takahiro
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Sprache:eng
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Zusammenfassung: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.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2019/10/071