"Highperformance Gravitational Wave Extraction in SpECTRE"Jordan Moxon , California Institute of Technology [Host: Alexander Grant]
ABSTRACT:
Numerical relativity stands as the primary method of generating precise waveform predictions for comparablemass compact binary coalescences used in gravitational wave data analysis pipelines. To produce those predictions, the spacetime in the vicinity of the binary system must be simulated to high precision, and then the waveform information must be extracted from the dynamical spacetime near the binary. Cauchy Characteristic Evolution (CCE) offers a wave extraction method capable of efficiently determining a complete, asymptotically wellbehaved metric at Scri+. For our implementation of CCE in SpECTRE, we have developed a number of mathematical refinements of the CCE system that improves spectral convergence and eases the computation of detailed dynamical spacetime information at Scri+. Our implementation in SpECTRE is far faster than previous CCE codes, is free from logarithmic pathologies, and computes full waveform information: news, strain, and all five Weyl scalars. I will discuss the numerical methods used to improve the performance of SpECTRE CCE, as well as several projects that have used the system to study gravitational wave memory and other subtle waveform effects that become available with full access to waveform data at Scri+. VIDEO:

Gravity Seminar Monday, April 26, 2021 1:00 PM Online, Room Zoom Note special time. Note special room. Join Zoom Meetinghttps://virginia.zoom.us/j/98166651049Meeting ID: 981 6665 1049 Passcode: 726235 
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