Inspiral into Gargantua

Niels Warburton; Samuel E. Gralla; Scott A. Hughes

Inspiral into Gargantua

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arxiv 1603.01221 v2 pith:OSTRPDA7 submitted 2016-03-03 gr-qc astro-ph.HEhep-th

Samuel E. Gralla , Scott A. Hughes , Niels Warburton This is my paper

classification gr-qcastro-ph.HEhep-th

keywords blackfrequencyholeinspiralbehaviorbodycharacterizedchirping

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We model the inspiral of a compact object into a more massive black hole rotating very near the theoretical maximum. We find that once the body enters the near-horizon regime the gravitational radiation is characterized by a constant frequency, equal to (twice) the horizon frequency, with an exponentially damped profile. This contrasts with the usual "chirping" behavior and, if detected, would constitute a "smoking gun" for a near-extremal black hole in nature.

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SEOB-TML cuts dephasing by up to an order of magnitude in the test-mass limit by Q-factorizing the flux (including horizon absorption) and by modeling mode mixing with extracted QNM coefficients.

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