Abstract
We present the first upper limit on gravitational wave (GW) backgrounds at an unexplored frequency of 0.2 Hz using a torsion-bar antenna (TOBA). A TOBA was proposed to search for low-frequency GWs. We have developed a small-scaled TOBA and successfully found at 0.2 Hz as demonstration of the TOBA’s capabilities, where is the GW energy density per logarithmic frequency interval in units of the closure density. Our result is the first nonintegrated limit to bridge the gap between the LIGO band (around 100 Hz) and the Cassini band ().
- Received 30 November 2010
DOI:https://doi.org/10.1103/PhysRevLett.106.161101
© 2011 American Physical Society
Synopsis
Tuning in to gravity
Published 20 April 2011
Tests of an early design for a gravity-wave detector determine sensitivity limits in a new frequency window.
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