Bulletin of the American Physical Society
APS April Meeting 2011
Volume 56, Number 4
Saturday–Tuesday, April 30–May 3 2011; Anaheim, California
Session X12: Signal Analysis Methods for Gravitational-wave Detection |
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Sponsoring Units: DAP GGR Chair: Neil Cornish, Montana State University Room: Royal CD |
Tuesday, May 3, 2011 10:45AM - 10:57AM |
X12.00001: Broadband Searches for Continuous-Wave Gravitation Radiation with LIGO Vladimir Dergachev Isolated rotating neutron stars are expected to emit gravitational radiation of nearly constant frequency and amplitude. Searches for such continuous waves (CW) are under way in data collected by the LIGO and Virgo Detectors over the last several years. Because CW signal amplitudes are thought to be extremely weak, long time integrations must be carried out to detect a signal. Integration is complicated by the motion of the Earth (daily rotation and orbital motion) which induces substantial modulations of detected frequency and amplitude that are highly dependent on source location. Large volumes of acquired data make this search computationally difficult. We will present the PowerFlux and ``Loosely coherent'' analysis pipelines, which account for these modulations, and discuss robustness to deviations from the ideal model of a monochromatic source. Results using data from the S5 run will be shown as well. [Preview Abstract] |
Tuesday, May 3, 2011 10:57AM - 11:09AM |
X12.00002: Testing a computationally efficient algorithm for detecting gravitational waves from neutron stars in binary systems Evan Goetz, Keith Riles An all-sky search for continuous gravitational waves from neutron stars in binary systems is notorious for its computational challenge. The TwoSpect algorithm exploits the periodic orbital modulation of the source waves by searching for patterns in doubly-Fourier transformed data. We present results from simulated gravitational wave detector data showing the efficacy of the TwoSpect search method. [Preview Abstract] |
Tuesday, May 3, 2011 11:09AM - 11:21AM |
X12.00003: Choosing precessing black hole binary simulations that cover the waveform space Richard O'Shaughnessy, Deirdre Shoemaker, James Healy, Zachary Meeks Numerical simulations of merging black hole (BH) binaries can provide a limited number of accurate waveforms for generic precessing binaries. Ideally, these simulations should thoroughly sample the emission-direction-dependent waveforms, through suitable choices for the six spins and two masses. By locally fitting the pairwise overlap versus spins and masses, we describe an iterative, stochastic procedure for selecting new initial configurations given waveforms derived from existing ones. Limiting attention to comparable-mass intermediate-mass BHs ($100-1000 M_\odot$), we summarize how well existing simulations cover the parameter space, as well as the number and nature of new simulations required both for detection and parameter estimation. [Preview Abstract] |
Tuesday, May 3, 2011 11:21AM - 11:33AM |
X12.00004: Reduced Basis for Gravitational Waves Manuel Tiglio, Scott Field, Chad Galley, Frank Herrmann, Jan Hesthaven, Evan Ochsner We introduce Reduced Basis (RB) as a method for gravitational wave representation and analysis. We comment on computational aspects and compare template catalogs for different detectors to other methods. In particular, we point out exponential convergence on the error of the resulting RB catalogs with the number of templates. [Preview Abstract] |
Tuesday, May 3, 2011 11:33AM - 11:45AM |
X12.00005: Properties of Reduced Basis catalogs for gravitational wave templates Chad Galley, Scott Field, Frank Herrmann, Jan Hesthaven, Evan Ochsner, Manuel Tiglio We discuss properties of gravitational waveform template banks constructed using the Reduced Basis (RB) method. We find that the continuum of gravitational waveforms can be represented by a finite and comparatively compact basis, which implies that the space of inspiral waveforms is effectively finite dimensional. Furthermore, the RB catalogs are robust under variations in the power spectral density of ground-based interferometer detectors, implying that only a single catalog needs to be generated for a given source per detector. We also find that one can construct a single template bank of reduced bases for a given inspiral source for Advanced LIGO which may be used reliably for gravitational wave searches with other ground-based interferometer detectors. [Preview Abstract] |
Tuesday, May 3, 2011 11:45AM - 11:57AM |
X12.00006: Coherent compact binary coalescence searches for external triggers with large sky-position errors Shaon Ghosh, Sukanta Bose Short hard gamma-ray bursts (SGRBs) are conjectured to have compact binary coalescences (CBCs) as progenitors. Therefore, SGRBs provide external triggers for searching signals from CBCs in gravitational-wave (GW) detectors. Whereas for many SGRBs the sky-position is determined by the electromagnetic detections with high accuracy, for some others it can be off by several degrees. Here we develop a method for coherently searching a patch of the sky, several degrees wide, for CBC signals in multiple baselines of GW detectors. We compare its performance in Gaussian noise with that of an all-sky (or ``blind'') search and a targeted search and show where it can perform better than the latter two. [Preview Abstract] |
Tuesday, May 3, 2011 11:57AM - 12:09PM |
X12.00007: Coherently searching for perturbed black-hole ringdown signals with a network of gravitational-wave detectors Dipongkar Talukder, Sukanta Bose We present results in Gaussian data from a template-based multi-detector coherent search for perturbed-black-hole ringdown signals. Like the previous ``coincidence'' ringdown searches in LIGO data, our method incorporates knowledge of the ringdown waveform in constructing the search templates. Additionally, it checks for consistency of signal amplitude and phase with the signals' times-of-arrival at the detectors. The latter feature is common to both of our method and the ``coherent WaveBurst'' algorithm, and can help bridge the gap in performance between the coincidence search and the coherent WaveBurst search for ringdown signals. [Preview Abstract] |
Tuesday, May 3, 2011 12:09PM - 12:21PM |
X12.00008: A method for a Search for Inspiral Merger and Ringdown Spin Aligned Waveforms using NINJA2 Mock Data Sets and gstlal Melissa Frei Compact binary coalescing systems, that is binary neutron stars, neutron star black hole pairs and binary black hole systems, rep- resent promising candidates for gravitational wave first detection and have the potential to provide precise tests of the strong-field predictions of general relativity. Observations of BBH systems will provide a wealth of information relevant to fundamental physics, astrophysics and cosmology. The search for such systems is a major priority of the Laser Interferometer Gravitational-Wave Observatory's (LIGO) and Virgo collaborations. A major area of research is incorporating black hole spin into binary black hole searches. In this talk, I will discuss a possible search for the gravitational waves produced by the inspiral, merger and ringdown of spin-aligned BBH systems using a new pipeline called gstlal and the preliminary results of a test search on mock data produced by the Numerical Injection Analysis Two (NINJA2) collaboration. [Preview Abstract] |
Tuesday, May 3, 2011 12:21PM - 12:33PM |
X12.00009: The BayesWave Algorithm for Detecting and Characterizing Gravitational Wave Burst Signals Neil Cornish, Paul Baker, Tyson Littenberg With a network of gravitational wave detectors it is possible to distinguish between instrumental artifacts, or glitches, and un-modeled gravitational wave signals. The LIGO-Virgo Burst group has developed several effective algorithms for detecting un-modeled, short duration burst signals such as might be generated by core collapse supernovae or associated with gamma ray burst. Here we present a new algorithm, ``BayesWave'' that uses Bayesian model selection to decide if features in the data are better described as gravitational wave signals or instrument glitches, and MCMC posterior reconstruction to characterize the physical content of the signal. As a by-product, this procedure produces cleaned data streams that are free of loud glitches. The cleaned data can then be used by standard template based searches for modeled signals such as binary inspirals, but now with significantly reduced backgrounds, making it possible to detect weaker signals. [Preview Abstract] |
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