Applications of the close-limit approximation: horizonless compact objects and scalar fields
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Applications of the close-limit approximation : horizonless compact objects and scalar fields. / Annulli, Lorenzo; Cardoso, Vitor; Gualtieri, Leonardo.
I: Classical and Quantum Gravity, Bind 39, Nr. 10, 105005, 19.05.2022.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Applications of the close-limit approximation
T2 - horizonless compact objects and scalar fields
AU - Annulli, Lorenzo
AU - Cardoso, Vitor
AU - Gualtieri, Leonardo
PY - 2022/5/19
Y1 - 2022/5/19
N2 - The ability to model the evolution of compact binaries from the inspiral to coalescence is central to gravitational wave astronomy. Current waveform catalogues are built from vacuum binary black hole models, by evolving Einstein equations numerically and complementing them with knowledge from slow-motion expansions. Much less is known about the coalescence process in the presence of matter, or in theories other than general relativity. Here, we explore the close limit approximation as a powerful tool to understand the coalescence process in general setups. In particular, we study the head-on collision of two equal-mass, compact but horizonless objects. Our results show the appearance of 'echoes' and indicate that a significant fraction of the merger energy goes into these late-time repetitions. We also apply the close limit approximation to investigate the effect of colliding black holes on surrounding scalar fields. Notably, our results indicate that observables obtained through perturbation theory may be extended to a significant segment of the merger phase, where in principle only a numerical approach is appropriate.
AB - The ability to model the evolution of compact binaries from the inspiral to coalescence is central to gravitational wave astronomy. Current waveform catalogues are built from vacuum binary black hole models, by evolving Einstein equations numerically and complementing them with knowledge from slow-motion expansions. Much less is known about the coalescence process in the presence of matter, or in theories other than general relativity. Here, we explore the close limit approximation as a powerful tool to understand the coalescence process in general setups. In particular, we study the head-on collision of two equal-mass, compact but horizonless objects. Our results show the appearance of 'echoes' and indicate that a significant fraction of the merger energy goes into these late-time repetitions. We also apply the close limit approximation to investigate the effect of colliding black holes on surrounding scalar fields. Notably, our results indicate that observables obtained through perturbation theory may be extended to a significant segment of the merger phase, where in principle only a numerical approach is appropriate.
KW - binary black holes
KW - extreme compact objects
KW - gravitational waves
KW - scalar fields
KW - COLLIDING BLACK-HOLES
KW - HEAD-ON COLLISIONS
KW - GRAVITATIONAL-RADIATION
KW - RELATIVISTIC STARS
KW - NORMAL-MODES
KW - INITIAL DATA
KW - BRANS-DICKE
KW - MASS
KW - SYSTEMS
KW - ENERGY
U2 - 10.1088/1361-6382/ac6410
DO - 10.1088/1361-6382/ac6410
M3 - Journal article
VL - 39
JO - Classical and Quantum Gravity
JF - Classical and Quantum Gravity
SN - 0264-9381
IS - 10
M1 - 105005
ER -
ID: 337974509