Speaker
Guangzhou Guo
(Tsung-Dao Lee Institute)
Description
Tidal interactions in compact binaries excite neutron-star oscillations and reshape the late inspiral. Semi-analytic studies predict that, as merger approaches, the growing tidal deformation couples stellar modes and shifts their frequencies. We compare nonlinear hydrodynamic evolutions with a coupled-mode treatment of the quadrupolar f-mode. For moderate tides, the measured shift follows the quadratic amplitude dependence predicted by second-order perturbation theory. At larger amplitudes it grows beyond that prediction, showing that the f-mode has entered a strongly nonlinear regime in which the frequency shift is no longer a small correction to the linear spectrum.
Author
Guangzhou Guo
(Tsung-Dao Lee Institute)