Search for a stochastic gravitational wave background at 1-5 Hz with Torsion-bar Antenna

Abstract

We set the first upper limit on the stochastic gravitational wave (GW) background in the frequency range of $1-5\mathrm{Hz}$ using a Torsion-bar Antenna (TOBA). A TOBA is a GW detector designed for the detection of low frequency GWs on the ground, with two orthogonal test masses rotated by the incident GWs. We performed a 24-hour observation run using the TOBA and set upper limits, based on frequentist statistics and Bayesian statistics. The most stringent values are ${\Omega }_{\mathrm{gw}}{h}_0^2\le 6.0\times 10^{18}$ (frequentist) and ${\Omega }_{\mathrm{gw}}{h}_0^2\le 1.2\times 10^{20}$ (Bayesian) both at $2.58\mathrm{Hz}$, where $h_0$ is the Hubble constant in units of $100km/s/Mpc$ and ${\Omega }_{\mathrm{gw}}$ is the GW energy density per logarithmic frequency interval in units of the closure density.

5 pages, 6 figures

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Cited by in corpus (1)

• TOrsion-Bar Antenna: A Ground-Based Detector for Low-Frequency Gravity Gradient Measurement