Enhancement of gravitational waves induced by scalar perturbations due to a sudden transition from an early matter era to the radiation era

Keisuke Inomata, Kazunori Kohri, Tomohiro Nakama, and Takahiro Terada
Phys. Rev. D 100, 043532 – Published 21 August 2019; Erratum Phys. Rev. D 108, 049901 (2023)

Abstract

We study gravitational waves induced from the primordial scalar perturbations at second order around the reheating of the Universe. We consider reheating scenarios in which a transition from an early matter-dominated era to the radiation-dominated era completes within a timescale much shorter than the Hubble time at that time. We find that an enhanced production of induced gravitational waves occurs just after the reheating transition because of fast oscillations of scalar modes well inside the Hubble horizon. This enhancement mechanism just after an early matter-dominated era is much more efficient than a previously known enhancement mechanism during an early matter era, and we show that the induced gravitational waves could be detectable by future observations if the reheating temperature TR is in the range TR7×102GeV or 20GeVTR2×107GeV. This is the case even if the scalar perturbations on small scales are not enhanced relative to those on large scales, probed by the observations of the cosmic microwave background.

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  • Received 16 May 2019

DOI:https://doi.org/10.1103/PhysRevD.100.043532

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Erratum

Authors & Affiliations

Keisuke Inomata1,2, Kazunori Kohri2,3,4, Tomohiro Nakama5, and Takahiro Terada3

  • 1ICRR, University of Tokyo, Kashiwa 277-8582, Japan
  • 2Kavli IPMU (WPI), UTIAS, University of Tokyo, Kashiwa 277-8583, Japan
  • 3Theory Center, IPNS, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • 4The Graduate University for Advanced Studies (SOKENDAI), 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan
  • 5Institute for Advanced Study, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong

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Issue

Vol. 100, Iss. 4 — 15 August 2019

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