Misaligned Spinning Binary Black Hole Mergers in Hot Magnetized Plasma

We present general relativistic magneto-hydrodynamical simulations of equal-mass spinning black hole binary mergers embedded in a magnetized gas cloud. focus on the effect spin orientation relative to orbital angular momentum flow dynamics, mass accretion rate and Poynting luminosity. find that, across inspiral, accreting onto individual holes concentrates into disk-like overdensities, whose momenta are oriented towards axes which persist until merger. identify quasi-periodic modulations occurring at level 1-20%, evolving parallel with gravitational wave chirp. The similarity between time-series strain is consequence interplay strong, dynamical fields magnetic vicinity inspiralling holes. This result suggests that quasi-periodicity pre-merger massive binaries not exclusive environments circumbinary disk, could provide an additional useful signature electromagnetic emission concurrent low-frequency detection.