Dec 11 – 15, 2023
Tsung-Dao Lee Institute
Asia/Shanghai timezone

Ultra-high frequency gravitational waves from inflaton decay

Dec 14, 2023, 5:15 PM
Hall # 1

Hall # 1

Contributed talk in mini symposium Dark Matter


Anna Tokareva (Hangzhou Institute for Advanced Study)


Since the models of inflation compatible with CMB data require non-renormalizable inflaton potentials, it is natural to have extra couplings between inflaton and gravitons. The suppression scale of such operators can well be lower than the Planck scale. Due to these couplings, inflaton can produce high frequency gravitons during reheating due to both decay and bremsstrahlung process. In my talk, I will present results of computation of the gravitational wave signal strength coming from these processes, as well as graviton contribution to the number of relativistic degrees of freedom. Remarkably, in the case of low reheating temperature, even Planck-suppressed operators lead to potentially measurable contribution to the dark radiation.

Primary author

Anna Tokareva (Hangzhou Institute for Advanced Study)

Presentation materials