NBIA Gravity Seminar: Sysky Rasanen

Speaker: Sysky Rasanen

Title: Walking on a bed of nails - effect of dark matter discreteness on light propagation

Abstract: In general relativity, light travels on null geodesics when the curvature of the wavefront and the spacetime are much smaller than photon energy. Localised dark matter particles can source large spacetime curvature, pushing light off null geodesics. I discuss how to take this effect into account, and how it may affect cosmological redshift and distance.