Numerical binary black hole collisions in dynamical ChernSimons gravity
Abstract
We produce the first numerical relativity binary black hole gravitational waveforms in a highercurvature theory beyond general relativity. In particular, we study headon collisions of binary black holes in orderreduced dynamical ChernSimons gravity. This is a precursor to producing beyondgeneralrelativity waveforms for inspiraling binary black hole systems that are useful for gravitational wave detection. Headon collisions are interesting in their own right, however, as they cleanly probe the quasinormal mode spectrum of the final black hole. We thus compute the leadingorder dynamical ChernSimons modifications to the complex frequencies of the postmerger gravitational radiation. We consider equalmass systems, with equal spins oriented along the axis of collision, resulting in remnant black holes with spin. We find modifications to the complex frequencies of the quasinormal mode spectrum that behave as a power law with the spin of the remnant, and that are not degenerate with the frequencies associated with a Kerr black hole of any mass and spin. We discuss these results in the context of testing general relativity with gravitational wave observations.
 Publication:

Physical Review D
 Pub Date:
 November 2019
 DOI:
 10.1103/PhysRevD.100.104026
 arXiv:
 arXiv:1906.08789
 Bibcode:
 2019PhRvD.100j4026O
 Keywords:

 General Relativity and Quantum Cosmology;
 Astrophysics  High Energy Astrophysical Phenomena;
 High Energy Physics  Theory
 EPrint:
 13 pages (+ appendices), 15 figures