Search for a Stochastic Gravitational-wave Background using a pair of Torsion-bar Antennas

Abstract

We have set a new upper limit on the stochastic gravitational wave background (SGWB) using two prototype Torsion-bar Antennas (TOBAs). TOBA is a low-frequency gravitational-wave detector with bar-shaped test masses rotated by the tidal force of gravitational waves. As a result of simultaneous 7-hour observations with TOBAs in Tokyo and Kyoto in Japan, our upper limit with a confidence level of 95% is ${\Omega }_{\mathrm{gw}}{h}_0^2<1.9\times 10^{17}$ at 0.035 - 0.830 Hz, where $h_0$ is the Hubble constant in units of 100 km/s/Mpc and ${\Omega }_{\mathrm{gw}}$ is the gravitational wave energy density per logarithmic frequency interval in units of the closure density. We successfully updated the upper limit and extended the explored frequency band.

5 pages, 4 figures

References in corpus (4)

• A new cosmic microwave background constraint to primordial gravitational waves
• Probing reheating temperature of the universe with gravitational wave background
• Search for a stochastic background of 100-MHz gravitational waves with laser interferometers
• Upper Limit on Gravitational Wave Backgrounds at 0.2 Hz with Torsion-bar Antenna

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