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Gravitational Waves from Particle Decays during Reheating
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Gravitational waves have become an irreplaceable tool for exploring the post-inflationary universe. Their cosmological and astrophysical origins have been attracting numerous attention. In this Letter, we point out a novel source of ultra-high frequency gravitational waves: the decay of particles produced during the reheating era. We highlight the decay of the Higgs boson as a representative case, showing how it yields a testable gravitational wave spectrum by future observations.
Forward citations
Cited by 4 Pith papers
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High-frequency gravitational waves from axion inflation in the weak-backreaction regime
Even in the weak-backreaction regime, axion inflation produces high-frequency primordial gravitational waves many orders of magnitude above the vacuum spectrum, peaking around MHz–GHz.
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Constraints on High-Frequency Gravitational Waves from Graviton-Photon Conversion in the M87 Galaxy
Graviton–photon conversion in M87's magnetic field sets h_c and Ωgw h² limits 1–5 orders of magnitude tighter than Milky Way-based bounds across 10^10–10^27 Hz.
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Primordial Gravitational Waves from Phase Transitions during Reheating
Phase transitions happening during reheating can produce gravitational-wave signals that are delayed, prolonged, and shifted in amplitude and frequency by orders of magnitude compared with standard cosmology.
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Gravitational Wave Spectrum from the Production of Dark Matter via the freeze-in Mechanism
Graviton bremsstrahlung during freeze-in dark matter production yields a high-frequency gravitational wave background peaking near 5.35 x 10^10 Hz, with UV freeze-in amplitudes up to Omega_GW h^2 ~ 1e-17.
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