Applications of the close-limit approximation: horizonless compact objects and scalar fields
Research output: Contribution to journal › Journal article › Research › peer-review
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.
Original language | English |
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Article number | 105005 |
Journal | Classical and Quantum Gravity |
Volume | 39 |
Issue number | 10 |
Number of pages | 27 |
ISSN | 0264-9381 |
DOIs | |
Publication status | Published - 19 May 2022 |
Externally published | Yes |
- binary black holes, extreme compact objects, gravitational waves, scalar fields, COLLIDING BLACK-HOLES, HEAD-ON COLLISIONS, GRAVITATIONAL-RADIATION, RELATIVISTIC STARS, NORMAL-MODES, INITIAL DATA, BRANS-DICKE, MASS, SYSTEMS, ENERGY
Research areas
Links
- https://arxiv.org/pdf/2104.11236.pdf
Submitted manuscript
ID: 337974509