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ON THE SENSITIVITY OF GRAVITATIONAL WAVE RESONANT BAR DETECTORS.
- Source :
-
International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology . Apr2004, Vol. 13 Issue 4, p625-639. 15p. - Publication Year :
- 2004
-
Abstract
- Different theoretical estimates of the sensitivity of gravitational wave resonant bar detectors, which have been published in the last decades, are reviewed and discussed. The "classical" cross-section estimate is obtained considering the bar as a classical or quantum oscillator, whose initial thermal state is that of a single oscillator driven by a single external stochastic force. Other theoretical studies computed a much larger cross-section, using a variety of quantum-mechanical arguments. The review of the existing literature shows that there is no well established model for the response of a resonant detector to gravitational waves. The resonant, yet random, nature of the Brownian thermal motion may justify considering the bar response at the fundamental longitudinal eigenfrequency as that of a large number of effective quantum mechanical oscillators. Assuming this hypothesis, quantum coherence effects, as first suggested by Weber, lead to a much larger cross-section than that "classically" predicted. The reduction of this amplification due to thermal noise itself is also computed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02182718
- Volume :
- 13
- Issue :
- 4
- Database :
- Academic Search Index
- Journal :
- International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology
- Publication Type :
- Academic Journal
- Accession number :
- 13533652
- Full Text :
- https://doi.org/10.1142/S021827180400475X