Upper Limit on Gravitational Wave Backgrounds at 0.2 Hz with Torsion-bar Antenna

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 Ωgw(f) < 4.3 \times 1017 at 0.2 Hz as demonstration of the TOBA's capabilities, where Ωgw (f) 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 (10-6 - 10-4 Hz).

4 pages, 5 figures

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• An Atomic Gravitational Wave Interferometric Sensor (AGIS)
• A new cosmic microwave background constraint to primordial gravitational waves
• Search for a stochastic background of 100-MHz gravitational waves with laser interferometers
• Stochastic background from inspiralling double neutron stars

Cited by in corpus (1)

• Scientific Potential of DECIGO Pathfinder and Testing GR with Space-Borne Gravitational Wave Interferometers