Bulletin of the American Physical Society
2005 APS April Meeting
Saturday–Tuesday, April 16–19, 2005; Tampa, FL
Session B10: Gravitational Waves: Ligo Scientific Collaboration Results |
Hide Abstracts |
Sponsoring Units: GGR Chair: Gabriela Gonzalez, Louisiana State University Room: Marriott Tampa Waterside Room 6 |
Saturday, April 16, 2005 10:45AM - 10:57AM |
B10.00001: A Time Series Waveform Consistency Test for Binary Inspirals in LIGO data Andres Rodriguez, Gabriela Gonzalez, Evan Ochsner, Peter Shawhan Searches for binary neutron star inspiral signals in data collected by earth based interferometric gravitational wave detectors utilize matched filtering techniques. Simple matched filtering is the optimal detection strategy if the detector noise is stationary and white. However, non-stationary noise sources, which are often found in gravitational wave detectors, can lead to ringing of the matched filter, resulting in a false inspiral "trigger". In order to minimize the number of these false candidates that pass our search pipeline, new tests must be developed. I will present a new waveform consistency test based upon the time series of the matched filter output. [Preview Abstract] |
Saturday, April 16, 2005 10:57AM - 11:09AM |
B10.00002: Broadband Search for Continous-Wave Gravitation Radiation with LIGO Vladimir Dergachev, Dave Chin, Keith Riles 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 first several data runs. Because the gravitational wave signal amplitudes are thought to be extremely weak, long time integrations must be carried out to detect a signal. Unfortunately, motion of the Earth (daily rotation and orbital motion) induces substantial modulations of detected frequency and amplitude, modulations that are highly dependent on source location. We will describe a method known as PowerFlux, used to account for these modulations, when summing power spectral density estimates incoherently over long time intervals. We will also describe the application of PowerFlux to a broadband search in data from the 70-day third LIGO Science Run (S3). [Preview Abstract] |
Saturday, April 16, 2005 11:09AM - 11:21AM |
B10.00003: Coherent wide parameter space searches for gravitational waves from neutron stars using LIGO S2 data Xavier Siemens The LIGO Scientific Collaboration is involved in two coherent wide parameter space searches for gravitational wave signals produced by rotating neutron stars. One of them is a search for gravitational waves from the low mass X-ray binary SCO X-1. The other is a blind search, over the entire sky and a wide range of frequencies, for continuous signals from isolated sources. Here we present an overview of the two data analysis methods, and apply them to LIGO data taken during the second science run (S2). [Preview Abstract] |
Saturday, April 16, 2005 11:21AM - 11:33AM |
B10.00004: Incoherent wide parameter-space searches for gravitational waves from neutron stars using LIGO S2 and S3 data Gregory Mendell, Michael Landry The LIGO Scientific Collaboration has developed several incoherent methods for wide parameter-space searches for continuous gravitational-wave signals from neutron stars. We present an overview of two of these methods: Stackslide and the Hough transform. These methods are less sensitive than fully-coherent matched filtering but are much more computationally efficient, allowing a larger parameter space to be searched with available computing resources. Application of these methods to LIGO data taken during the second and third science runs (S2 and S3), as well as plans to incorporate these methods into future hierarchical searches, will also be presented. [Preview Abstract] |
Saturday, April 16, 2005 11:33AM - 11:45AM |
B10.00005: Search for inspiraling black holes with the LIGO gravitational wave detectors Alexander Dietz The LIGO Scientific Collaboration has completed several science runs collecting data with the LIGO gravitational wave detectors in the Livingston and Hanford observatories. We will report on the progress made in the analysis of the second science run for inspiraling black holes. The data analysis is done using matched filtering techniques, using a family of templates that generalizes known approximate waveforms for inspiraling black holes[1]. Test signals have been added offline to the data to test the analysis technique and to compare the recovered and the injected black hole parameters. Also a method is discussed to estimate the accidental background trigger rate. \\ [1] A. Buonanno, Y. Chen, M. Vallisneri, Phys. Rev. D67 (2003) 024016 [Preview Abstract] |
Saturday, April 16, 2005 11:45AM - 11:57AM |
B10.00006: New LIGO Results in the Search for Gravitational-Wave Bursts Laura Cadonati The Laser Interferometer Gravitational-wave Observatory (LIGO) Burst Analysis group is pursuing searches for unmodeled gravitational-wave transients of short duration ($<$ 1 sec) in the 100-2000 Hz frequency band. Plausible sources of this type of signal are core-collapse supernovae and the merger and ringdown phases of coalescing binary systems. This talk presents new limits on the measurable rate of gravitational-wave bursts. Such limits constitute a significant improvement over the published results from the first LIGO science run, due to the increased observational time, better detector sensitivity and more sophisticated analysis techniques. In particular, the search in the 700-2000 Hz band has benefited from collaborations and data exchange with the TAMA (Japan) and GEO600 (Germany) interferometers, a major step forward in the implementation of a world-wide network of gravitational-wave detectors. [Preview Abstract] |
Saturday, April 16, 2005 11:57AM - 12:09PM |
B10.00007: Results of searches for low-mass binary coalescences on LIGO data Eirini Messaritaki The LIGO Scientific Collaboration is currently involved in various searches for gravitational waves from coalescences of low-mass binary systems. In this talk we report on the search for coalescences of neutron star binaries, with component masses between 1 and 3 solar masses, and on the search for coalescences of primordial black hole binaries, with component masses between 0.2 and 1 solar masses, using the data from the second science run of the 3 LIGO intereferometers. No candidate gravitational wave signals were identified. The results have been used to calculate upper limits on the rate of low-mass compact binary coalescences in the universe. [Preview Abstract] |
Saturday, April 16, 2005 12:09PM - 12:21PM |
B10.00008: Searching for gravitational radiation from known radio pulsars using LIGO data Brian O'Reilly The LIGO gravitational wave detectors are now regularly performing science observation runs as they approach their final design sensitivity. Here we present results from the second run (2003) in which we performed a deep search for gravitational waves from 28 isolated pulsars, including the Crab pulsar. The expected signal was derived by combining a theoretical model of gravitational wave emission from a non-axially symmetric spinning neutron star with timing data from radio observations of the pulsars. Although no signals were detected the observations imply that the equators of the four closest pulsars are circular to better than 1 part in $10^5$. Projected sensitivities from subsequent science runs will also be discussed. [Preview Abstract] |
Saturday, April 16, 2005 12:21PM - 12:33PM |
B10.00009: The Search for a Stochastic Gravitational Wave Background Valery Frolov Detection of a stochastic background of gravitational waves of cosmological origin would provide a unique view of conditions in the very early universe. There are astrophysical observations that provide meaningful upper limits to such a background. Measurements using earth based gravitational wave detectors are now beginning to provide interesting upper limits as well. The techniques and status of searching for a gravitational wave background using the LIGO interferometers will be presented, and the prospects for ultimately detecting such a background will be discussed. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700