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Gravitational Wave Probe of Planck-scale Physics After Inflation
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Particle decays are always accompanied by the emission of graviton quanta of gravity through bremsstrahlung processes. However, the corresponding branching ratio is suppressed by the square of the ratio of particle's mass to the Planck scale. The resulting present abundance of gravitational waves (GWs), composed of gravitons, is analogously suppressed. We show that superheavy particles, as heavy as the Planck scale, can be naturally produced during the post-inflationary reheating stage in the early Universe and their decays yield dramatic amounts of GWs over broad frequency range. GW observations could hence directly probe Planck-scale physics, notoriously challenging to explore.
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Cited by 2 Pith papers
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Inflation and Reheating by Dynamical Torsion
The dynamical-torsion inflaton decays via chiral anomalies and Yukawa-assisted three-body channels, yielding a reheating temperature of 10^5–10^7 GeV and testable CMB/GW predictions.
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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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