Stochastic Gravitational Waves from Inflaton Decays

Abstract

Due to the universality of gravitational interactions, it is generally expected that a stochastic gravitational wave (GW) background could form during the reheating period when the inflaton perturbatively decays with the emission of gravitons. Previously, only models in which the inflaton dominantly decays into a pair of light scalar and/or fermion particles were considered in the literature. In the present paper, we focus on the cases with a vector particle pair in the final decay product. The differential decay rates for the three-body gravitational inflaton decays are presented for two typical couplings between the inflaton and vector fields, from which we predict their respective GW frequency spectra. It turns out that, similar to the scalar and fermion cases, the obtained GW spectra is too high in frequency to be observed by the current and near-future GW detection experiments and calls for a new design of high-frequency GW detectors.

15 pages, 4 figures

References in corpus (7)

• Laser Interferometer Space Antenna
• Probing reheating temperature of the universe with gravitational wave background
• Precision calculations of the gravitational wave background spectrum from inflation
• Gravitational Effects on Inflaton Decay
• Search for a stochastic background of 100-MHz gravitational waves with laser interferometers
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• Gravitational waves from the vacuum decay with LISA
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• Freeze-in gravitational waves and dark matter in warm inflation
• A New Source of Phase Transition Gravitational Waves: Heavy Particle Braking Across Bubble Walls
• Stochastic gravitational wave from graviton bremsstrahlung in inflaton decay into massive spin 3/2 particles
• Probing Bose-enhanced Inflaton Decay with Gravitational Waves