FCORT · Fusion of Compact Objects by Ray Tracing: Gravitational wave observables from the time evolution of the event horizon in extreme mass ratio mergers

The project is a cutting-edge exploration of the dynamics of black hole collisions in general relativity and in modified gravity theories in an innovative way that makes the merging of black holes amenable to analytic treatment in the extreme-mass-ratio limit. By developing an approach based on ray tracing, the project assumes a pioneering stance, leveraging strong field tests of gravity to impart stringent constraints on modified gravity theories and learning more about black hole merging and matter collapse. The approach is complementary to other techniques currently employed, but in a regime that is not accessible to them.Central to its timeliness is the burgeoning of gravitational wave astronomy, hastening the need for empirical validation. The forthcoming Laser Interferometer Space Antenna (LISA) adds further urgency, promising novel insights into strong gravity within a decade.