Discovering Love numbers of black holes

by Ms. Shani Avitan

at Particles and Fields Seminar

Mon, 09 Jan 2023, 14:00
Sacta-Rashi Building for Physics (54), room 207


Current and future experiments in Gravitational Waves are providing and expected to provide more and more information about binary black hole mergers. Measuring a deviation from point-particles motion due to the hypothetical excitation of the internal structure of the internal oscillation modes would be inconsistent with GR description of classical black holes by the Kerr geometry. We consider the inspiral of a binary system composed of exotic ultra compact objects (UCOs). We further assume that during the gradual increase in the orbital frequency, the internal mode of the UCO can be resonantly excited. Building on previous results about compact objects binaries, we know that this excitation mediates an energy transfer from the orbit to the internal mode. As a result, an effectively instantaneous shift in the orbital frequency will occur. Here we relate the phase shift in the phase of the emitted GW signal to the UCO quadrupolar Love number, using the relation between the Love number and characteristic frequency of the internal modes of the quantum black hole. Finally we discuss the detectability of this phase shift in future observation, based on the LISA sensitivity estimates, and show that for sufficiently large mass ratio this effect imprint on the signal could be detected.

Created on 08-01-2023 by Chapman, Shira (schapman)
Updaded on 08-01-2023 by Chapman, Shira (schapman)