Bulletin of the American Physical Society
2009 APS April Meeting
Volume 54, Number 4
Saturday–Tuesday, May 2–5, 2009; Denver, Colorado
Session B11: LIGO Progress and Plans |
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Sponsoring Units: GGR DAP Chair: Vuk Mandic, Univerisity of Minnesota Room: Plaza Court 1 |
Saturday, May 2, 2009 10:45AM - 10:57AM |
B11.00001: Broadband Search 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 radiation with the LIGO interferometers are underway, using data taken from LIGO's fifth science run. Because the gravitational wave signal amplitudes are thought to be extremely weak, long time integrations must be carried out to detect a signal. This 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 amounts of acquired data make this computationally difficult. We present an algorithm called PowerFlux, used to account for these modulations, when summing power spectral density estimates incoherently over long time intervals. We will show results from the application of the PowerFlux detection pipeline to a broadband search in the initial data of the S5 run and discuss current approaches to carrying out a broadband (50-1500 Hz) search over 2 years of data. [Preview Abstract] |
Saturday, May 2, 2009 10:57AM - 11:09AM |
B11.00002: Search for bursts from cosmic (super)strings in LIGO S4 data Xavier Siemens Cosmic (super)strings produce powerful bursts of gravitational waves that may be detectable by LIGO. In this talk I will discuss the methods and results of a search for such bursts in LIGO fourth science run (S4) data. [Preview Abstract] |
Saturday, May 2, 2009 11:09AM - 11:21AM |
B11.00003: Stacking Gravitational Waves from SGR Bursts Peter Kalmus Soft gamma-ray repeaters (SGRs) have unique properties that make them intriguing GW targets. Recently a LIGO search for transient GW from these sources placed upper limits on a set of almost 200 individual SGR bursts. These limits were within the theoretically predicted range of some models. We discuss a new search which builds upon the method used there. The new method aims to ``stack'' potential GW signals from multiple SGR bursts. We assume that variation in the time difference between the peak in electromagnetic emission and the peak in potential gravitational wave emission is small relative to the GW signal duration, and we time-align GW excess power time-frequency tilings containing individual burst triggers to their corresponding electromagnetic peaks. Using Monte Carlo simulations, we show that gains in GW energy sensitivity of $N^{1/2}$ are possible, where $N$ is the number of stacked SGR bursts. We discuss application of the stacking search technique to the SGR 1900+14 storm, a dramatic multi-episodic bursting event which occurred during LIGO's fifth science run (S5). [Preview Abstract] |
Saturday, May 2, 2009 11:21AM - 11:33AM |
B11.00004: Search for Compact Binary Signals Using Coherent WaveBurst Chris Pankow Compact binary coalescence (CBC) is one of the most promising sources of gravitational waves. These sources are usually searched for with matched filters which require accurate calculation of the GW waveforms and generation of large template banks. We present a complementary search technique based on burst algorithms. Initially designed for detection of un-modeled bursts, which can span a very large set of waveform morphologies, the search algorithm presented here is constrained for targeted detection of the smaller subset of CBC signals. The constraint is based on the assumption of elliptical polarization. We expect that the algorithm will be sensitive to CBC signals in a wide range of masses, mass ratios, and spin parameters. We also present preliminary studies of the algorithm on test data as well as the sensitivity of the search to different types of simulated waveforms. Also, we compare the performance of the constrained search and the coherent WaveBurst search used for the burst analysis of LIGO data. [Preview Abstract] |
Saturday, May 2, 2009 11:33AM - 11:45AM |
B11.00005: Low-latency search for gravitational-wave transients with electromagnetic follow-up: plans and progress Joshua Smith In the coming months the LIGO and Virgo laser interferometric gravitational wave detectors will recommence their coordinated search for gravitational waves with increased astrophysical range. We present plans and progress towards implementing a low-latency search for gravitational-wave transients during the upcoming run. A goal of this search will be to identify candidate events and corresponding sky locations within tens of minutes. In the Advanced LIGO era (starting around 2014), when detections should be commonplace, prompt electromagnetic follow-up of burst signals will be extremely valuable for extracting the maximum astrophysical information from detections. To lay the foundations of this type of multi-messenger gravitational-wave astronomy, we are now arranging to carry out a pilot program of electromagnetic follow-ups, in collaboration with other astronomers. [Preview Abstract] |
Saturday, May 2, 2009 11:45AM - 11:57AM |
B11.00006: Prospects for Joint Searches between Gravitational-wave and High-Energy Neutrino Detectors Imre Bartos, Shin'ichiro Ando, Yoichi Aso, Bruny Baret, Matteo Barsuglia, Patrick Brady, Eric Chassande-Mottin, Shourov Keith Chatterji, Irene Di Palma, John Dwyer, Veronique Van Elewyck, Chad Finley, Kei Kotake, Sergei Klimenko, Antoine Kouchner, Szabolcs M\'arka, Zsuzsa M\'arka, Christian D. Ott, Thierry Pradier, Jameson Rollins, Antony Searle, Patrick Sutton, Eric Thrane Cataclysmic cosmic events, e.g. gamma ray bursts (GRBs), can be plausible sources of both gravitational waves (GWs) and high-energy neutrinos (HENs). Identifying correlations between GW and HEN detection channels shall enable new searches, as one has significant additional information about the common source. Beyond the benefit of a potential discovery, coincident detection of GW and HEN arriving from the same astronomical source might allow us to answer important scientific questions, which would be out of reach for a single channel detector. Analysis method options and Monte Carlo simulations will be discussed to demonstrate the expected performance of feasible searches. A survey of cosmic source candidates will be presented to describe the possible science reach of the data analysis initiative. [Preview Abstract] |
Saturday, May 2, 2009 11:57AM - 12:09PM |
B11.00007: Results from Prototype Advanced LIGO Seismic Isolation Jeffrey Kissel In 2008, new seismic isolation systems were installed in the two LIGO 4km gravitational wave detectors. These systems are prototypes of the system planned for Advanced LIGO which will achieve improved interferometer sensitivity to astrophysical events. We present the measured performance of the new isolation systems. We compare this to the current advanced LIGO requirements and discuss potential improvements which may allow even better performance in the future. [Preview Abstract] |
Saturday, May 2, 2009 12:09PM - 12:21PM |
B11.00008: Update on Suspension Design for Advanced LIGO Norna Robertson The Advanced LIGO project aims at a tenfold improvement in sensitivity over the performance of the initial LIGO gravitational-wave detector while at the same time reducing the low-frequency cutoff from $\sim $40~Hz~to $\sim $10~Hz. Achieving such an improvement is technically challenging, requiring a noise level at 10~Hz of $\sim 10^{-19}$~m/$\surd $~Hz at each test mass of the interferometer. Two fundamental noise sources which contribute at low frequencies are seismic noise and thermal noise associated with the suspension of the masses. In this talk we discuss our work on developing a quadruple pendulum suspension system incorporating a monolithic silica suspension for Advanced LIGO, and we present results from a prototype suspension and from associated experiments aimed at testing some of the aspects of the design. [Preview Abstract] |
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