Tuesday November 15
3pm N209 ESC

Can Kilic
UT Austin

Title: Stepped Partially Acoustic Dark Matter

Abstract: We are in an exciting era for cosmology, with an ever-increasing amount and level of precision of observations. The next few years will likely provide us with conclusive directions for how our minimal cosmological model needs to be extended. The existing tensions between early vs. late time measurements of the Hubble parameter and large scale structure (in the form of the S8 parameter) may in fact be the first hints that the single-species collisionless dark matter paradigm is no longer a good fit to data. In my talk I will present a simple model for a dark sector that nevertheless leads to rich dynamics and that has the potential to address the Hubble and S8 tensions, while also remaining a good fit to the CMB and the matter power spectrum.