Gravitational Detection of New Particle Interactions with Cosmology

Who: Kris Sigurdson (British Columbia)
When: Monday, June 29, 2015 at 14:15
Where: The CP³ meeting room

If feebly interacting particles like neutrinos or dark matter are coupled to new particles in a hidden sector these couplings generically alter the evolution of linear cosmological perturbations at early times and the distribution of these particles in the Universe at late times.  In this talk I will discuss how cosmological perturbations and can be used to constrain (or detect) new particle interactions that may otherwise be inaccessible.  In particular I will focus on signatures of and constraints on new secret neutrino interactions from cosmology that delay neutrino decoupling and interactions that couple dark matter to a relativistic plasma.