Sonic search for monopoles, gravitational waves and newtorites

Details Sonic search for monopoles, gravitational waves and newtorites Sonic search for monopoles, gravitational waves and newtorites

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nuphb.242...93b&link_type=abstract

Nuclear Physics B, Volume 242, Issue 1, p. 93-144.

Physics

Nuclear Physics

30

Scientific paper

Hopes for the detection of gravitational waves and of very massive magnetic monopoles rely on cosmological sources - the big bang itself in the monopole's case. Some gravitational wave antennas are ``acoustic'' resonant detectors, that have reached a sensitivity not far from the ``quantum limit''. We investigate in detail the response of these sensitive detectors to the passage of ``relic'' monopoles. We compute signal to noise ratios for a variety of target materials, and we find them to be favourable for the very cold, high quality resonators that are presently contemplated. A monopole traversing a metal produces a ``thermo-acoustic'' pulse, whose amplitude is linear in the monopole's velocity, β. If the metal is superconducting, there is a novel additional ``magneto-acoustic'' source, whose amplitude is β-independent. Monopole detectors that rely on ionization have a sensitivity threshold in β, and may conceivably be blind to relic monopoles. The response of superconducting loop detectors is β-independent, but their collection areas are limited by the requirement of a sophisticated magnetic shielding. Neither of the above limitations would be shared by an acoustic monopole detector. We sketch a ``sonic antenna'' that would respond directionally to coventional cosmic rays, gravitational radiation, monopoles, and even to more exotic signals, like newtorites (elementary or composite ``meteorites'' that interact with ordinary matter only gravitationally).
Permanent address: Niels Bohr Institute, Blegdamsvej 17, Copenhagen Ø, Denmark.

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