[AstroSeminar] Francisco Duque
Giovedì, 13 febbraio·13:30 – 14:30
Host: Alice Spadaro
Speaker: Francisco Duque (AEI, Potsdam)
Title: Wet Eccentric Extreme-Mass-Ratio Inspirals
Abstract: In this talk, we will discuss the evolution of eccentric, equatorial extreme-mass-ratio inspirals (EMRIs) immersed in the accretion disks of active galactic nuclei. We will see how single gravitational-wave observations from these systems could provide measurements with ~ 10% relative precision of, simultaneously, the disk viscosity and mass accretion rate of the central supermassive black hole. This is possible when the EMRI transitions, within the observation time, from supersonic to subsonic motion relative to the disk gas, for eccentricities e >~ 0.025-0.1. The estimate of the accretion rate would assist in the identification of the EMRI's host galaxy, or the observation of a direct electromagnetic counterpart, improving the chances of using these sources as cosmological sirens. We will also discuss a possible strategy to assist the detection of environmental effects and other "beyond-vacuum-GR" effects in the context of LISA Global Fit, based on correcting for the biases and reweighting the posteriors obtained with vacuum-only templates.