Stochastic Gravitational Waves from Particle Origin

Abstract

We propose that there may be a substantial stochastic gravitational wave background from particle origin, mainly from the gravitational three-body decay of the inflaton. The emitted gravitons could constitute a sizable contribution to dark radiation if the mass of inflaton is close to the Planck scale, which can be probed by future CMB experiments that have a sensitivity on the deviation of the effective number of neutrinos in the standard cosmology, $\delta N_{\text{eff}}\sim 0.02-0.03$. We have also illustrated the spectrum of the radiated gravitational waves, in comparison to the current and future experiments, and found that gravitational waves from particle origin could be the dominant contribution to the energy density at high-frequency domain, but beyond the sensitivity regions of various experiments.

arXiv comment1+13 pages, 6 figures; Decay width are updated

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• Gravitational Wave Sourced by Decay of Massive Particle from Primordial Black Hole evaporation
• Cosmological Origin of the KM3-230213A event and associated Gravitational Waves
• Graviton-photon conversion in blazar jets as a probe of high-frequency gravitational waves
• High-frequency gravitational waves from first-order phase transitions
• 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 leptogenesis and the minimal neutrino seesaw mechanism through gravitational waves
• Probing Bose-enhanced Inflaton Decay with Gravitational Waves