LIGO Document G1701129-v2

Hierarchical search strategies for compact binary coalescences using aligned-spin waveforms

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The current template-based searches for gravitational waves from coalescing compact binaries in the data from LIGO-like detectors use waveform models in which total and orbital angular momenta are parallel to each other. Even with these aligned-spin models over the restricted parameter space, one has to use a bank containing few millions of waveforms to filter out the signal from the noisy data. The search is already computationally expensive. A similar search with larger parameter space, better statistic and with longer waveforms will be even costlier computationally and with more potential triggers to follow. Moreover, searches for precessing binaries are currently computationally prohibitive. To reduce the computational cost of the current searches, we have extended the two-stage hierarchical technique previously developed for non-spinning waveforms with aligned-spin banks incorporating coincidences and vetoes at each stage. On simulated data, we manage to reduce the computational cost by more than an order of magnitude while recovering all the signals detectable by the standard flat coincidence search. Even for real data, we expect the search to speed up by a factor of a few. We are also trying to introduce a simple cross-correlation step to prioritise analysis of those chunks of the data which are more likely to contain detectable gravitational signals, to further enhance the efficiency of the search.
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CBC Hierarchical search
Notes and Changes:
Some grammar corrections and changes suggested during PnP review.
Associated with Events:
Amaldi 12 held on 09 Jul 2017 in Hilton Hotel, Pasadena, CA

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