Speaker
Han-Gil Choi
(Seoul National University)
Description
Cosmological structures at subgalacticscales are pristine testbeds for dark matter(DM) physics. However, they are too diffuse and dark to be visible in any existing observations. In thiswork,wedevelopformalisms for diffractive lensing and show that itcanbeusedto detect diffuseDM halos with chirping gravitational waves(GWs) from massive binary black holes. Assuming Navarro-Frenk-White profile for DM halo, GW detector like Big bang observer is expected to detect such lensing events due to 103−4𝑀⊙halos at a rateof O(10) per year. We also demonstrate how diffractive weak lensing can be used to measure a lens profile.
