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Abstract:
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.
Biography:
Anna Tokareva is an Associate Professor at Hangzhou Institute for Advanced Study since June 2023. She got her PhD in 2016 from the Institute for Nuclear Research RAS in Moscow, Russia after doctoral studies at the Moscow State University. After that she got postdoctoral experience at EPFL, Lausanne, Switzerland, Institute for Nuclear Research, Moscow, Russia, University of Jyvaskyla, Finland, and Imperial College London in the UK. Her main scientific results and interests are at the borderline between cosmology, quantum gravity and formal aspects of quantum field theory.
Alternative online link: https://meeting.tencent.com/dm/WoNP47AhKhlg
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