PIRSA:21010016

Coherent Gravitational Waveforms and Memory from Cosmic String Loops

Aurrekoetxea, J. (2021). Coherent Gravitational Waveforms and Memory from Cosmic String Loops . Perimeter Institute. https://pirsa.org/21010016

Aurrekoetxea, Josu. Coherent Gravitational Waveforms and Memory from Cosmic String Loops . Perimeter Institute, Jan. 21, 2021, https://pirsa.org/21010016 

          @misc{ pirsa_PIRSA:21010016,
            doi = {10.48660/21010016},
            url = {https://pirsa.org/21010016},
            author = {Aurrekoetxea, Josu},
            keywords = {Strong Gravity},
            language = {en},
            title = {Coherent Gravitational Waveforms and Memory from Cosmic String Loops },
            publisher = {Perimeter Institute},
            year = {2021},
            month = {jan},
            note = {PIRSA:21010016 see, \url{https://pirsa.org}}
          }

Josu Aurrekoetxea University of Oxford

DOI 10.48660/21010016
Collection
Talk Type Scientific Series
Subject

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 characteristic ringdown as a black hole is formed. Furthermore, we investigate the waveform and energy emitted as a function of width, 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 E_GW / M_0 ∼ O(1)% at the percent level, for the regime where Gμ ~ 1e-3 . Conversely, we show that the efficiency is only weakly dependent on the initial string width and initial string radii. Using these results, we argue that gravitational wave production is dominated by kinematical instead of geometrical considerations.