Fundamental Physics and Chemistry Space Science in the Twenty-First Century -- Imperatives for the Decades 1995 to 2015 (1988) / Chapter Skim
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3. Gravitational Wave Astronomy
3. Gravitational Wave Astronomy
Pages 21-25
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From page 21... ...
The development of low-frequency gravitational wave detectors and ultimately a space gravitational wave observatory is a major new direction proposed in this study for the space program. The observation of gravitational radiation from astrophysical sources has several features.
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From page 22... ...
Estimates of the gravitational wave flux incident on the Earth from astrophysical sources have been divided into three categories: sources of gravitational wave impulses or bursts, periodic sources that may produce continuous gravitational wave trains, and, finally, sources of a gravitational wave background noise. The categories are related to different techniques for detection.
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From page 23... ...
Should the eccentricity be entirely due to distortion of the star by the magnetic fields trapped In the star during the collapse from an ordinary star, the wave amplitudes from pulsars in our own galaxy would give strains of 10-32 to 10-33, much too small to measure. However, the pulsar could have an intrinsic mass eccentricity, which, if it was as large as 10-5, would produce a measurable strain of 10-26.
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From page 24... ...
The sensitivity of gravitational wave observations on the ground is advancing rapidly. Acoustic bar detectors at cryogenic temperature using low noise position transducers are now able to search for gravitational wave bursts In the kilohertz band with a strain sensitivity of 10~~.
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From page 25... ...
The promise for greatly enhanced sensitivity lies in constructing these systems with 100 times larger length and increased position sensitivity by increasing the light power modulated by the interferometer. The systems are ~nherently broadband, and as the techniques for reducing the stochastic forces on the masses unprove, they are expected to perform at a pube strain sensitivity of better than 10-22 between 10 Hz and 1 kHz.
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