A selection of talks I have given related to my work on theoretical cosmology.

Superfluids and the Cosmological Constant Problem (PDF)

A talk on a recent proposal by my collaborators and myself to dynamically screen out a large cosmological constant using a finite-temperature cosmological superfluid.

Cosmology and a Massive Graviton (PDF)

I discuss my collaborators' and my work on massive gravity, its extension to bigravity, and cosmological tests thereof.

Aspects of Field Theory with Higher Derivatives (PDF)

This talk deals with my work on field theoretic aspects of scalar and scalar-tensor theories, including the galileon and Horndeski theories popularly used for cosmological purposes. I discuss non-perturbative solutions and effective field theory considerations.