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Journal Article

#### Interior of a Binary Black Hole Merger

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1903.05626.pdf

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##### Citation

Pook-Kolb, D., Birnholtz, O., Krishnan, B., & Schnetter, E. (2019). Interior of
a Binary Black Hole Merger.* Physical Review Letters,* *123*(17):
171102. doi:10.1103/PhysRevLett.123.171102.

Cite as: https://hdl.handle.net/21.11116/0000-0003-54E7-A

##### Abstract

We find strong numerical evidence for a new phenomenon in a binary black hole

spacetime, namely the merger of marginally outer trapped surfaces (MOTSs). We

show that the MOTS associated with the final black hole merges with the two

initially disjoint surfaces associated with the two initial black holes. This

yields a connected sequence of MOTSs interpolating between the initial and

final state all the way through the non-linear binary black hole merger

process. This now allows us to track physical quantities (such as mass, angular

momentum, higher multipoles, and fluxes) across the merger, which can be

potentially compared with the gravitational wave signal in the wave-zone, and

with observations by gravitational wave detectors. This also suggests a

possibility of proving the Penrose inequality for generic astrophysical binary

back hole configurations.

spacetime, namely the merger of marginally outer trapped surfaces (MOTSs). We

show that the MOTS associated with the final black hole merges with the two

initially disjoint surfaces associated with the two initial black holes. This

yields a connected sequence of MOTSs interpolating between the initial and

final state all the way through the non-linear binary black hole merger

process. This now allows us to track physical quantities (such as mass, angular

momentum, higher multipoles, and fluxes) across the merger, which can be

potentially compared with the gravitational wave signal in the wave-zone, and

with observations by gravitational wave detectors. This also suggests a

possibility of proving the Penrose inequality for generic astrophysical binary

back hole configurations.