My research interests lie at the interface between cosmology and particle physics. Recently I have been working on theories in which Einstein gravity is modified at cosmological distances, as an alternative to the standard Lambda-CDM model. I am also studying their observational implications, in particular for structure formation.
My work also focuses on alternatives to the inflationary paradigm of early universe cosmology, in particular the Ekpyrotic Universe. In this scenario, the seeds of structure formation are generated in a long phase of slow contraction before the big bang. My collaborators and I have been studying potential observational signatures of ekpyrosis, such as primordial gravitational waves and non-Gaussianity.