Applications of low temperature physics to gravitational astronomy

Details Applications of low temperature physics to gravitational astronomy Applications of low temperature physics to gravitational astronomy

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phyb..197...28b&link_type=abstract

Physica B: Physics of Condensed Matter, Volume 197, Issue 1-4, p. 28-38.

Physics

Condensed Matter

1

Scientific paper

For twenty years a dedicated community of physicists has been developing resonant mass gravitational wave detectors which exploit the unique advantages of low temperature physics. Several tonne masses are suspended in large scale cryostats. Superconducting transducers monitor vibrations to a sensitivity ~10-19 metres. Suspension systems and materials properties allow the acoustic Q-factor of the antenna to exceed 108, corresponding to acoustic ring down times of several days. Massive bars have been cooled to less than 100 mK using dilution refrigerators. Using these methods thermal Nyquist noise is reduced such that the antenna effective temperature is reduced to a few microdegrees. A world-wide array of detectors should now allow any gravitational collapse which gives rise to the birth of a neutron star or black hole to be detected anywhere in our galaxy.

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