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PRODID:UW-Madison-Physics-Events
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SEQUENCE:1
UID:UW-Physics-Event-6602
DTSTART:20211005T190000Z
DTEND:20211005T200000Z
DTSTAMP:20260414T192153Z
LAST-MODIFIED:20210930T210507Z
LOCATION:https://berkeley.zoom.us/j/99464252867
SUMMARY:Mode-by-mode Relative Binning: Fast Likelihood Estimation for 
 Gravitational Waveforms with Spin-Orbit Precession and Multiple Harmon
 ics\, Network in Neutrinos\, Nuclear Astrophysics\, and Symmetries (N3
 AS) Seminar\, Nathaniel Leslie\, UC Berkeley
DESCRIPTION:Faster likelihood evaluation enhances the efficiency of gr
 avitational wave signal analysis. We present Mode-by-mode Relative Bin
 ning (MRB)\, a new method designed for obtaining fast and accurate lik
 elihoods for advanced waveform models that include spin-orbit precessi
 on effects and multiple radiation harmonics from compact binary coales
 cence. Leveraging the ``twisting-up'' procedure of constructing preces
 sing waveform modes from non-precessing ones\, the new method mitigate
 s degrade of relative binning accuracy due to interference from superi
 mposed modes. Additionally\, we supplement algorithms for optimizing t
 he choice of frequency bins specific to any given strain signal under 
 analysis. Using the new method\, we are able to evaluate the likelihoo
 d with up to an order of magnitude reduction in the number of waveform
  model calls per frequency compared to the previously used relative bi
 nning scheme\, and achieve better likelihood accuracy than is sufficie
 nt for obtaining source parameter posterior distributions that are ind
 istinguishable from the exact ones.
URL:https://www.physics.wisc.edu/events/?id=6602
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