Tuesday, April 14, 2020, 1:30pm to 2:30pm
BHI Meeting Room
Kevin Nguyen (BHI and Harvard University)
Title: Dynamical damping of the cosmological constant: a proof of concept
Abstract: I will discuss a simple and generic class of scalar-tensor theories in which occurs a dynamical damping of the Hubble expansion rate towards a small attractor value, therefore providing a possible mechanism for solving the cosmological constant problem. In this model, smallness of the late-time Hubble expansion rate is controlled by parameters that are radiatively stable, in contrast to the situation encountered within the LambdaCDM model of cosmology.