High-frequency Graviton from Inflaton Oscillation
Yohei Ema, Ryusuke Jinno, Kazunori Nakayama
TL;DR
This paper identifies a high-frequency tail in the inflationary gravitational wave background caused by inflaton oscillations, revealing potential insights into inflaton properties and early Universe thermal history.
Contribution
It introduces a novel high-frequency tail in the gravitational wave spectrum linked to inflaton oscillations during reheating, providing new observational probes.
Findings
High-frequency tail scales as $f^{-1/2}$ in the gravitational wave spectrum.
The tail encodes information about inflaton mass and early Universe thermal history.
Amplification of graviton vacuum fluctuations during reheating.
Abstract
We point out that there is a high-frequency tail of the stochastic inflationary gravitational wave background that scales as with frequency . 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.
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