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Geodesic stability, Lyapunov exponents and quasinormal modes
Vitor Cardoso, Alex S. Miranda, Emanuele Berti +2
Geodesic motion determines important features of spacetimes. Null unstable geodesics are closely related to the appearance of compact objects to external observers and have been as…
The high-energy collision of two black holes
U. Sperhake, V. Cardoso, F. Pretorius +2
We study the head-on collision of two highly boosted equal mass, nonrotating black holes. We determine the waveforms, radiated energies, and mode excitation in the center of mass f…
Transformation of the multipolar components of gravitational radiation under rotations and boosts
L. Gualtieri, E. Berti, V. Cardoso +1
We study the transformation of multipolar decompositions of gravitational radiation under rotations and boosts. Rotations to the remnant black hole's frame simplify the waveforms f…
Accuracy of the Post-Newtonian Approximation: Optimal Asymptotic Expansion for Quasi-Circular, Extreme-Mass Ratio Inspirals
Nicolas Yunes, Emanuele Berti
We study the accuracy of the post-Newtonian (PN) approximation and its formal region of validity, by investigating its optimal asymptotic expansion for the quasi-circular, adiabati…
Quasinormal modes and thermodynamic phase transitions
Emanuele Berti, Vitor Cardoso
It has recently been suggested that scalar, Dirac and Rarita-Schwinger perturbations are related to thermodynamic phase transitions of charged (Reissner-Nordström) black holes. In…
Cosmological black hole spin evolution by mergers and accretion
Emanuele Berti, Marta Volonteri
Using recent results from numerical relativity simulations of black hole mergers, we revisit previous studies of cosmological black hole spin evolution. We show that mergers are ve…