LIGO Document T2200250-v1

Recovering Higher Order Modes in the Ringdown of Binary Black Hole Coalescences

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T - Technical notes
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Disturbances in the curvature of spacetime from the coalescence of binary black holes can be probed by the gravitational radiation emitted by these sources and recorded by Advanced LIGO and Virgo. The merger of such objects allows us to test Einsteinís theory of general relativity in the regime of strong and highly dynamical gravity - specifically, the newly-formed single black hole rings down in a series of quasinormal modes, whose frequencies and damping rates are fully predicted by general relativity. Deriving characteristics from this powerful signal is one of the ways we are able to familiarize ourselves with such distant and exotic objects. Deviations from predictions may provide phenomena beyond general relativity that we are not yet familiar with. We propose to study ways in which this may be revealed in gravitational wave data.
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