Kent Yagi's Website

My current research goal is to probe fundamental physics using astrophysical compact objects, such as black holes and neutron stars. I am particularly interested in testing strong/dynamical-field gravity and determining the equation of state of nuclear matter with gravitational waves from compact binaries. Such gravitational waves allow us to probe gravity and nuclear physics in a regime that was inaccessible from previous experiments and observations. Deviations away from General Relativity and tidal effects on neutron stars that contain nuclear physics information both affect binary orbital dynamics, and such effects are encoded in the gravitational waveform. Having these theoretical predictions at hand, one can carry out a data analysis study to address how well future gravitational wave observations can probe these fundamental physics. 

I also work on the theoretical modeling of neutron stars. In particular, I am interested in studying universal relations among neutron star observables that are insensitive to the stellar internal structure. This is in contrast with the famous neutron star mass-radius relation that depends strongly on the equation of state. One example of such universal relations is the “I-Love-Q” relations, those among the moment of inertia (I), the tidal deformability (or the Love number), and the quadrupole moment (Q). Universal relations allow us to probe important physics, including astrophysics, nuclear physics, gravitational physics, and cosmology, with future electromagnetic wave and gravitational wave observations.