Coherent gravitational waveforms and memory from cosmic string loops

Josu C. Aurrekoetxea; Thomas Helfer; Eugene A. Lim

doi:10.1088/1361-6382/aba28b

Coherent gravitational waveforms and memory from cosmic string loops

Josu C. Aurrekoetxea^*, Thomas Helfer, Eugene A. Lim

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

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Abstract

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 EGW/M0 ∝ 1/Gμ, with EGW/M0 ∼ O(1)% 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.

Original language	English
Article number	aba28b
Journal	Classical and Quantum Gravity
Volume	37
Issue number	20
DOIs	https://doi.org/10.1088/1361-6382/aba28b
Publication status	Published - 22 Oct 2020

Keywords

Cosmic string
General relativity
Gravitational wave memory
Gravitational waves
Numerical relativity
Waveform modelling

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10.1088/1361-6382/aba28b

Aurrekoetxea_2020_Class._Quantum_Grav._37_204001Licence: CC BY

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title = "Coherent gravitational waveforms and memory from cosmic string loops",

abstract = "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 EGW/M0 ∝ 1/Gμ, with EGW/M0 ∼ O(1)% 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. ",

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AU - Aurrekoetxea, Josu C.

AU - Helfer, Thomas

AU - Lim, Eugene A.

PY - 2020/10/22

Y1 - 2020/10/22

N2 - 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 EGW/M0 ∝ 1/Gμ, with EGW/M0 ∼ O(1)% 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.

AB - 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 EGW/M0 ∝ 1/Gμ, with EGW/M0 ∼ O(1)% 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.

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KW - General relativity

KW - Gravitational wave memory

KW - Gravitational waves

KW - Numerical relativity

KW - Waveform modelling

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Coherent gravitational waveforms and memory from cosmic string loops

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