Rare events detected with a bulk acoustic wave high frequency gravitational wave antenna

Goryachev, M., Campbell, W. M., Heng, I. S. , Galliou, S., Ivanov, E. N. and Tobar, M. E. (2021) Rare events detected with a bulk acoustic wave high frequency gravitational wave antenna. Physical Review Letters, 127(7), 071102. (doi: 10.1103/PhysRevLett.127.071102)

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Abstract

This work describes the operation of a high frequency gravitational wave detector based on a cryogenic bulk acoustic wave cavity and reports observation of rare events during 153 days of operation over two separate experimental runs (run 1 and run 2). In both run 1 and run 2, two modes were simultaneously monitored. Across both runs, the third overtone of the fast shear mode (3B) operating at 5.506 MHz was monitored; whereas in run 1, the second mode was chosen to be the fifth overtone of the slow shear mode (5C) operating at 8.392 MHz. However, in run 2, the second mode was selected to be closer in frequency to the first mode; and it was chosen to be the third overtone of the slow shear mode (3C) operating at 4.993 MHz. Two strong events were observed as transients responding to energy deposition within acoustic modes of the cavity. The first event occurred during run 1 on 12 May 2019 (UTC), and it was observed in the 5.506 MHz mode; whereas the second mode at 8.392 MHz observed no event. During run 2, a second event occurred on 27 November 2019 (UTC) and was observed by both modes. Timings of the events were checked against available environmental observations as well as data from other detectors. Various possibilities explaining the origins of the events are discussed.

Item Type:Articles
Additional Information:This research was supported by the Australian Research Council (ARC) Grant No. DP190100071, along with support from the ARC Centre of Excellence for Engineered Quantum Systems (No. CE170100009) and the ARC Centre of Excellence for Dark Matter Particle Physics (No. CE200100008).
Keywords:Gravitational wave detection.
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Heng, Professor Ik Siong
Authors: Goryachev, M., Campbell, W. M., Heng, I. S., Galliou, S., Ivanov, E. N., and Tobar, M. E.
Subjects:Q Science > QB Astronomy
Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:Institute for Gravitational Research
Journal Name:Physical Review Letters
Publisher:American Physical Society
ISSN:0031-9007
ISSN (Online):1079-7114
Published Online:12 August 2021
Copyright Holders:Copyright © 2021 American Physical Society
First Published:First published in Physical Review Letters 127(7): 071102
Publisher Policy:Reproduced in accordance with the publisher copyright policy
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