Numerical binary black hole collisions in dynamical Chern-Simons gravity. (arXiv:1906.08789v1 [gr-qc])
<a href="http://arxiv.org/find/gr-qc/1/au:+Okounkova_M/0/1/0/all/0/1">Maria Okounkova</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Stein_L/0/1/0/all/0/1">Leo C. Stein</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Scheel_M/0/1/0/all/0/1">Mark A. Scheel</a>, <a href="http://arxiv.org/find/gr-qc/1/au:+Teukolsky_S/0/1/0/all/0/1">Saul A. Teukolsky</a>
We produce the first numerical relativity binary black hole gravitational
waveforms in a higher-curvature theory beyond general relativity. In
particular, we study head-on collisions of binary black holes in order-reduced
dynamical Chern-Simons gravity. This is a precursor to producing
beyond-general-relativity waveforms for inspiraling binary black hole systems
that are useful for gravitational wave detection. Head-on collisions are
interesting in their own right, however, as they cleanly probe the quasi-normal
mode spectrum of the final black hole. We thus compute the leading-order
dynamical Chern-Simons modifications to the complex frequencies of the
post-merger gravitational radiation. We consider equal-mass 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 quasi-normal
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.
We produce the first numerical relativity binary black hole gravitational
waveforms in a higher-curvature theory beyond general relativity. In
particular, we study head-on collisions of binary black holes in order-reduced
dynamical Chern-Simons gravity. This is a precursor to producing
beyond-general-relativity waveforms for inspiraling binary black hole systems
that are useful for gravitational wave detection. Head-on collisions are
interesting in their own right, however, as they cleanly probe the quasi-normal
mode spectrum of the final black hole. We thus compute the leading-order
dynamical Chern-Simons modifications to the complex frequencies of the
post-merger gravitational radiation. We consider equal-mass 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 quasi-normal
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.
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