Ultralight dark matter is a compelling dark matter candidate. Recent numerical simulations have shown that ultralight dark matter halo exhibits an order-one density fluctuation all over galaxies. Such an order-one density fluctuation can be conveniently understood as a quasiparticle whose size and mass could take astronomical values. In this talk, I will discuss how such quasiparticles might interact with interferometers, designed for the detection of gravitational waves. Through the gravitational interactions, quasiparticles continuously interrupt the test masses in interferometers, leaving interesting signals that we can look for. With some examples, I will discuss the general effects of such ultralight dark matter quasiparticles and the prospect of current and future interferometers for ultralight dark matter search.
DFA and INFN, Sezione di Padova
