Coherent Gravitational Waveforms and Memory from Cosmic String Loops
Feb 12, 2020
23 pages
Published in:
- Class.Quant.Grav. 37 (2020) 20, 204001
- Published: Sep 25, 2020
e-Print:
- 2002.05177 [gr-qc]
Report number:
- KCL-PH-TH/2020-06
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Abstract: (IOP)
We construct, for the first time, the time-domain gravitational wave strain waveform from the collapse of a strongly gravitating Abelian Higgs cosmic string loop in full general relativity. We show that the strain exhibits a large memory effect during merger, ending with a burst and the characteristic ringdown as a black hole is formed. Furthermore, we investigate the waveform and energy emitted as a function of string width, loop radius and string tension Gμ. We find that the mass normalized gravitational wave energy displays a strong dependence on the inverse of the string tension E GW/M 0 ∝ 1/Gμ, with at the percent level, for the regime where Gμ ≳ 10−3. Conversely, we show that the efficiency is only weakly dependent on the initial string width and initial loop radii. Using these results, we argue that gravitational wave production is dominated by kinematical instead of geometrical considerations.Note:
- 15 pages, 16 figures, 2 YouTube movies: https://youtu.be/-dhYA2788LA https://youtu.be/0sSH54gXu4U
- string: width
- gravitational radiation: energy
- energy: emission
- string tension
- cosmic string
- general relativity
- gravitation
- black hole: formation
- efficiency
- kinematics
References(103)
Figures(17)