Speaker
Description
Gravitational waves (GW) radiated by compact binary coalescences can be diffracted by astrophysical-size objects due to long wavelength.
This is so called diffractive lensing. The length scale of the diffraction is determined by the geometric mean of GW wave length and the effective distance to lens, and it becomes O(1 pc) assuming GW frequency ~ 1Hz and the distance to lens ~ 1 Gpc. Therefore, diffractive lensing phenomena can be used to probe cosmological structures around parsec length scales assuming proper GW sources and detectors. I'll show the prospect for probing very light dark matter (sub-) halo with this phenomena. Furthermore, I will discuss how can we constrain sub-parsec matter power spectrum even when we can not detect single diffractive lensing event.
