- #1
- 24,775
- 792
Posted 6 May 2005
http://arxiv.org/abs/gr-qc/0505029
Upper limits on gravitational wave bursts in LIGO's second science run
Authors: LIGO Scientific Collaboration
23 pages, 14 figures, to be submitted to Phys Rev D
"We perform a search for gravitational wave bursts using data from the second science run of the LIGO detectors, using a method based on a wavelet time-frequency decomposition. This search is sensitive to bursts of duration much less than a second and with frequency content in the 100-1100Hz range. It features significant improvements in the instrument sensitivity and in the analysis pipeline with respect to the burst search previously reported by LIGO. Improvements in the search method allow exploring weaker signals, relative to the detector noise floor, while maintaining a low false alarm rate, O(0.1) microHz. The sensitivity in terms of the root-sum-square (rss) strain amplitude lies in the range of hrss~10^{-20} - 10^{-19}/sqrt(Hz) No gravitational wave signals were detected in 9.98 days of analyzed data. We interpret the search result in terms of a frequentist upper limit on the rate of detectable gravitational wave bursts at the level of 0.26 events per day at 90% confidence level. We combine this limit with measurements of the detection efficiency for given waveform morphologies in order to yield rate versus strength exclusion curves as well as to establish order-of-magnitude distance sensitivity to certain modeled astrophysical sources. Both the rate upper limit and its applicability to signal strengths improve our previously reported limits and reflect the most sensitive broad-band search for untriggered and unmodeled gravitational wave bursts to date."
Since LQG is basically an explicit quantization of General Relativity (with some quantum corrections/higher-order terms allowed), results that confirm expectations based on Gen Rel can be seen as favorable. Or at least the opposite as unfavorable.
On the second run, they tried for 10 days to detect waves, and they did not see any. From a quantum gravity viewpoint it would have been nice, but it didnt work out. maybe next time.
thanks to Lubos for calling attention to this report
http://arxiv.org/abs/gr-qc/0505029
Upper limits on gravitational wave bursts in LIGO's second science run
Authors: LIGO Scientific Collaboration
23 pages, 14 figures, to be submitted to Phys Rev D
"We perform a search for gravitational wave bursts using data from the second science run of the LIGO detectors, using a method based on a wavelet time-frequency decomposition. This search is sensitive to bursts of duration much less than a second and with frequency content in the 100-1100Hz range. It features significant improvements in the instrument sensitivity and in the analysis pipeline with respect to the burst search previously reported by LIGO. Improvements in the search method allow exploring weaker signals, relative to the detector noise floor, while maintaining a low false alarm rate, O(0.1) microHz. The sensitivity in terms of the root-sum-square (rss) strain amplitude lies in the range of hrss~10^{-20} - 10^{-19}/sqrt(Hz) No gravitational wave signals were detected in 9.98 days of analyzed data. We interpret the search result in terms of a frequentist upper limit on the rate of detectable gravitational wave bursts at the level of 0.26 events per day at 90% confidence level. We combine this limit with measurements of the detection efficiency for given waveform morphologies in order to yield rate versus strength exclusion curves as well as to establish order-of-magnitude distance sensitivity to certain modeled astrophysical sources. Both the rate upper limit and its applicability to signal strengths improve our previously reported limits and reflect the most sensitive broad-band search for untriggered and unmodeled gravitational wave bursts to date."
Since LQG is basically an explicit quantization of General Relativity (with some quantum corrections/higher-order terms allowed), results that confirm expectations based on Gen Rel can be seen as favorable. Or at least the opposite as unfavorable.
On the second run, they tried for 10 days to detect waves, and they did not see any. From a quantum gravity viewpoint it would have been nice, but it didnt work out. maybe next time.
thanks to Lubos for calling attention to this report