Constraining inflaton coupling from CMB in different inflation models

26 Aug 2021, 16:40
20m
ZR5

ZR5

Early Universe Cosmology Early Universe Cosmology

Speaker

Lei Ming (Department of Physics, Nanjing University)

Description

This talk focusses on constraining the inflaton couplings and reheating temperature by the CMB data in different inflation models. It has been pointed out that within a given inflation model, it is possible to “measure” the inflaton coupling from CMB. The models parameters can be related to the observable CMB data by the reheating parameters. Using the Planck 2018 data, we give constraints to the inflaton couplings and the reheating temperature in three inflation models. In these models there exist regions where it is possible to give analytic relations between the inflaton couplings and the spectral index. Besides, we find that in a specific model one can impose a lower (or upper) bound on the couplings only using the spectral index, even if the tensor-to-scalar ratio is never measured.

Primary author

Lei Ming (Department of Physics, Nanjing University)

Co-author

Prof. Marco Drewes (CP3, UCLouvain)

Presentation materials