Speaker
Derek Inman
(RIKEN iTHEMS)
Description
Cosmic halo formation is typically expected to begin deep in the matter-dominated epoch of the Universe. However, this expectation rests on assuming standard initial conditions and dark matter properties. In this talk I will discuss two situations which relax these assumptions. In the first, I will discuss initial conditions with larger than anticipated small scale fluctuations, leading to halo formation just after matter radiation equality. In the second, I will consider dark sector interactions that cause halo formation in the radiation era through long-range attractive forces.