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High-frequency Graviton from Inflaton Oscillation
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abstract
We point out that there is a high-frequency tail of the stochastic inflationary gravitational wave background that scales as $f^{-1/2}$ with frequency $f$. This contribution comes from the graviton vacuum fluctuation amplified by the inflaton coherent oscillation during the reheating stage. It contains information on inflaton properties such as the inflaton mass as well as the thermal history of the early Universe.
Forward citations
Cited by 3 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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Graviton Production from Inflaton Condensate: Boltzmann vs Bogoliubov
For quadratic inflaton potentials Boltzmann and Bogoliubov spectra agree at short wavelengths, but for steeper potentials non-adiabatic transition effects captured only by Bogoliubov are sizable across a broad momentum range.
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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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