Below is 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 I to dynamically screen out a large cosmological constant using a finite-temperature cosmological superfluid.
• Cosmology and a Massive Graviton (PDF). I discuss my and my collaborators’ work on massive gravity, its extension to bigravity, and cosmological tests thereof.
• Aspects of Field Theory with Higher Derivatives (PDF). This talk is about 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.