Luan, Jing and Hooper, Shaun and Wen, Linqing and Chen, Yanbei (2012) Towards low-latency real-time detection of gravitational waves from compact binary coalescences in the era of advanced detectors. Physical Review D, 85 (10). Art. No. 102002. ISSN 0556-2821. http://resolver.caltech.edu/CaltechAUTHORS:20120613-133448882
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Electromagnetic (EM) follow-up observations of gravitational wave events will help shed light on the nature of the sources, and more can be learned if the EM follow-ups can start as soon as the gravitational wave event becomes observable. In this paper, we propose a computationally efficient time-domain algorithm capable of detecting inspiral gravitational waves from coalescing binaries of compact objects with nearly no further delay in addition to the time required to condition the data into a time series of calibrated gravitational-wave strain. Our algorithm, if can be expanded to include sky localization, will serve as the first step towards triggering EM observation before the merger. The key to the efficiency of our algorithm arises from the use of chains of so-called infinite impulse response filters, which filter time-series data recursively. Computational cost is further reduced by a template interpolation technique that requires filtering only done for a “coarse bank”, much sparser than the “fine bank” normally required to sufficiently recover the optimal signal-to-noise ratio: the filter chain of each coarse-bank template is divided into several sections, filtering output from these sections are combined appropriately to reconstruct the output of each of the nearby fine-bank templates. The filter construction and interpolation techniques are illustrated in this paper using Newtonian-chirp waveforms, although these will be generalizable to more accurate post-Newtonian waveforms. Towards future detectors with sensitivity extending to lower frequencies, our algorithm’s computational cost is shown to increase rather insignificantly compared to the conventional time-domain correlation method using finite impulse response filters.
|Additional Information:||© 2012 American Physical Society. Received 16 August 2011; published 14 May 2012. We thank R. Adhikari for introducing us to the concept of IIR filters and for suggesting us to consider using IIRs for compact binary coalescence searches. We are grateful for inspiring discussions with K. Cannon, C. Hanna, D. Keppel, A. Weinstein, P. Brady, S.K. Chung, D. Blair, B. Mours, L. Singer, P. Shawhan, B. Allen, and N. Fotopoulos. This work has been supported in part by the NSF under grant Nos. PHY1068881, PHY-0601459, PHY- 0653653, (LIGO) and CAREER Grant PHY-0956189 and the David and Barbara Groce start-up fund at Caltech, and by the Australian Research Council (ARC).|
|Classification Code:||PACS: 04.80.Nn, 95.75.-z, 97.60.Gb, 97.80.-d|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||14 Jun 2012 17:47|
|Last Modified:||26 Dec 2012 15:20|
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