Speaker
Alexandra Nemtinova
Description
Inflation is the leading model of the early Universe, predicting primordial gravitational waves characterized by the tensor-to-scalar ratio $r$ and the tensor spectral tilt $n_t$. We present updated constraints on these parameters using the latest cosmic microwave background temperature and polarization data from Planck, the South Pole Telescope, the Atacama Cosmology Telescope, and the BICEP/Keck experiments, placing new constraints on inflationary models. We also constrain the gravitational-wave energy density and test whether the excess power observed by NANOGrav can be explained by primordial gravitational waves.
Author
Alexandra Nemtinova