Supermassive rotating boson stars in highly-asymmetric binaries: transient resonances and gravitational-wave observables

Abstract:
The historic detection of gravitational waves paved the way for precision gravitational-wave astrophysics to blossom at unprecedented proportions. The sensitivity increment of ground-based interferometers, as well as the arrival of next generation space-borne detectors, will unequivocally strengthen our understanding of the gravitational interaction in extreme conditions. In this talk, I will focus on one of the prime targets of LISA, the so-called extreme-mass-ratio inspirals (EMRIs).

EMRIs are binaries that consist of a primary supermassive compact object, and a stellar-mass secondary companion. Even though we are currently performing pertinent tests to characterize the ``Kerrness'' of astrophysical compact objects that reside in galactic cores, environmental effects, quantum corrections and generally multipolar deformations can significantly affect the gravitational-wave emission from non-Kerr sources.

In this talk, I will discuss the rich orbital and waveform phenomenology of EMRIs as well as potential observables of fascinating effects associated with transient resonances in non-Kerr black-hole mimickers and in particular supermassive rotating boson stars. Finally, I will briefly discuss the impact of exotic objects on the gravitational radiation emitted from such binaries, that may be distinguishable with future space-based detectors, in order to shed more light into the electromagnetic degeneracies that currently exist between black holes and exotic compact objects.