Speaker
Description
Extreme mass-ratio inspirals (EMRIs) are one of the major sources of gravitational waves (GWs) that will be detected by LISA. Similar to the compact binary mergers detected by current GW detectors, EMRIs can be used as cosmic rulers to probe the expansion of the Universe and our current cosmological paradigm, the LambdaCDM model. Interestingly, modified gravity theories can affect the propagation of GWs over cosmological distances, with modifications that can be phenomenologically parametrised and uniquely probed with GW observations.
In this talk, I will discuss how EMRIs can be used as “dark standard sirens” together with redshift information from galaxy catalogues. I will first show what constraints can be placed on the Hubble constant and the dark energy equation of state using EMRIs as dark sirens; then I will focus on the so-called $\Xi_0-n$ parametrisation for general relativity deviations and show what constraints can be placed on it using EMRIs.
