Abstract
Transient gravitational-wave searches can be divided into two main families of approaches: modeled and unmodeled searches, based on matched filtering techniques and time-frequency excess power identification respectively. The former, mostly applied in the context of compact binary searches, relies on the precise knowledge of the expected gravitational-wave phase evolution. This information is not always available at the required accuracy for all plausible astrophysical scenarios, e.g., in the presence of orbital precession, or eccentricity. The other search approach imposes little priors on the targeted signal. We propose an intermediate route based on a modification of unmodeled search methods in which time-frequency pattern matching is constrained by astrophysical waveform models (but not requiring accurate prediction for the waveform phase evolution). The set of astrophysically motivated patterns is conveniently encapsulated in a graph, that encodes the time-frequency pixels and their co-occurrence. This allows the use of efficient graph-based optimization techniques to perform the pattern search in the data. We show in the example of black-hole binary searches that such an approach leads to an averaged increase in the distance reach () for this specific source over standard unmodeled searches.
- Received 11 May 2018
- Corrected 3 August 2018
DOI:https://doi.org/10.1103/PhysRevD.98.024028
© 2018 American Physical Society
Physics Subject Headings (PhySH)
Corrections
3 August 2018
Correction: The lower panel of the previously published Fig. 6 contained an error and its corrected replacement has been posted.