Speaker
Description
The description of Extreme Mass Ratio Inspirals (EMRIs) in modified theories of gravity can be very complex. However, for a vast class of theories with additional scalar fields, great simplifications occur. At leading order in the binary mass ratio, the primary scalar charge is suppressed, so that the background spacetime is simply described by the Kerr metric. Moreover, the imprint of the scalar field on the waveform is fully captured by two parameters: the scalar charge carried by the secondary and the scalar field mass. Using these simplifications, I will show how the two parameters affects the EMRI dynamics, how such changes get imprinted on the emitted signals, and the extremely promising results on the LISA ability to detect new fundamental fields.
