Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session D8: Gravitational Waves: Data Analysis |
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Sponsoring Units: GGR DAP Chair: Melissa Frei, Rochester Institute of Technology Room: Embassy B |
Saturday, March 31, 2012 3:30PM - 3:42PM |
D8.00001: Practical stochastic template placement for spinning gravitational-wave inspiral searches Nickolas Fotopoulos, Stephen Privitera, Melissa Frei Compact binary coalescences are promising and interesting sources of gravitational-waves for Advanced gravitational-wave detectors. While the rates are highly uncertain, many of these binaries likely have a black hole component. Astrophysical black holes especially are expected to have significant spin angular momentum, but published searches for them have thus far used matched filter banks built from waveform models that only take component masses into account---no spin. I present SBank, a stochastic placement scheme that is fast, can operate with or without a signal mismatch metric, and is easily extensible to new waveform families. We have so far applied SBank to produce template banks of three-dimensional, mass1--mass2--aligned-spin waveforms in the low-mass, inspiral-only regime, with guidance from an analytical signal metric, and in the high-mass, inspiral-merger-ringdown regime, where we currently have no metric. I will share what we've learned about higher-dimensional banks and what we expect to gain in detection rate. [Preview Abstract] |
Saturday, March 31, 2012 3:42PM - 3:54PM |
D8.00002: Chirplet Clustering Algorithm for Black Hole Coalescence Signatures in Gravitational Wave Detectors Zachary Nemtzow, Eric Chassande-Mottin, Satyanarayan R.P. Mohapatra, Laura Cadonati Within this decade, gravitational waves will become new astrophysical messengers with which we can learn about our universe. Gravitational wave emission from the coalescence of massive bodies is projected to be a promising source for the next generation of gravitational wave detectors: advanced LIGO and advanced Virgo. We describe a method for the detection of binary black hole coalescences using a chirplet template bank, Chirplet Omega. By appropriately clustering the linearly variant frequency sin-Gaussian pixels the algorithm uses to decompose the data, the signal to noise ratio SNR of events extended in time can be significantly increased. We present such a clustering method and discuss its impacts on performance and detectability of binary black hole coalescences in ground based gravitational wave interferometers. [Preview Abstract] |
Saturday, March 31, 2012 3:54PM - 4:06PM |
D8.00003: The NINJA-2 Waveform Catalog Larne Pekowsky Two important advances have occurred in recent years which have brought us closer to the goal of observing and interpreting gravitational waves from coalescing compact objects: the successful construction and operation of a world-wide network of ground-based gravitational-wave detectors and the impressive success of numerical relativity in successfully simulating the merger phase of Binary Black Hole (BBH) coalescence. The aim of the NINJA project is to study the sensitivity of gravitational-wave analysis pipelines to numerical simulations of waveforms and foster close collaboration between numerical relativists and data analysts. NINJA-1 was a huge success, over 75 numerical relativists and data analysis participated in the contribution of a simulated data set containing numerical waveforms, analysis of this data and interpreting the results of this analysis. The follow-up project, NINJA-2 is currently underway. We present some of the goals of NINJA-2 and discuss aspects of the construction of the catalog of waveforms which will be used. [Preview Abstract] |
Saturday, March 31, 2012 4:06PM - 4:18PM |
D8.00004: Loosely coherent searches for continuous gravitational waves Vladimir Dergachev Isolated rotating neutron stars are expected to emit gravitational radiation of nearly constant frequency and amplitude. Searches for such radiation from unknown stars are computationally limited, with recent results from an all sky search achieving sensitivity to strains as small as 1e-24. We present a new ``Loosely Coherent'' algorithm which shows a 10x gain in efficiency over previously available programs. We will discuss future applications of loosely coherent searches to exploring extended regions on the sky, with sensitivity comparable to long-duration strictly coherent algorithms. [Preview Abstract] |
Saturday, March 31, 2012 4:18PM - 4:30PM |
D8.00005: Helping to improve gravitational wave searches with the Critical Coupling Likelihood Technique Cristina Torres, Cesar Costa As part of LIGO's search for gravitational waves (GW) we find ourselves trying to determine if unwanted or unknown sources of noise are coupling into the output of current interferometric GW detectors. To aid in this challenge of understanding instrumental noise sources, we have continued our development of the Critical Coupling Likelihood (CCL) method. The goal of CCL is to offer semi-autonomous quantitative inspection of an instrument's data quality for each individual detector involved in identifying a potential GW signal. We will discuss some early results observed when applying CCL to a small sample of LIGO data from the end of the sixth science run. In addition to these early promising results we would like to show our preliminary attempts to do more with CCL than identify noise in archived data but to understand the noise components present in a GW in close to real time. Simple tests to do just that have been done with on-line detectors. CCL was used to try and identify both known noise sources and seek out new detector noise sources. In addition to identifying instances of noise coupling the CCL method can be used to construct simple empirically derived pseudo-transfer function like mappings to identify the physical mechanisms in which noise affects a GW detector. [Preview Abstract] |
Saturday, March 31, 2012 4:30PM - 4:42PM |
D8.00006: ABSTRACT WITHDRAWN |
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