### Abstract

We performed a simultaneous observational run with prototypes of Torsion-bar Antenna (TOBA) and searched for a stochastic gravitational waves (GW) background. TOBA is a new type of GW detector which measures differential rotation of two test-mass bars caused by tidal force from GWs. It fundamentally has a good sensitivity at lower frequencies, such as 0.1-1.0 Hz. The prototype has a 20-cm test mass bar which is levitated by the pinning effect of a superconductor. The data was taken from 1:00 am to 10:00 am on March 11th 2011, at Tokyo and Kyoto in Japan. As a result, we did not detect a stochastic GW background with false alarm rate of 5 %, and set an upper limit on a stochastic GW background. Our 95 % confidence upper limit is Ω_{gw}h ^{2}_{0} < 1.2 × 10^{19} at 0.06 - 0.9 Hz, where Ω_{gw} is the GW energy density per logarithmic frequency interval in units of the critical density and h_{o} is the Hubble constant per 100 km/sec/Mpc. We had established the simultaneous observation and the analysis pipeline with two TOBAs, and set an upper limit at a wider frequency band.

Original language | English |
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Article number | 012017 |

Journal | Journal of Physics: Conference Series |

Volume | 363 |

Issue number | 1 |

DOIs | |

Publication status | Published - 2012 |

Externally published | Yes |

Event | 9th Edoardo Amaldi Conference on Gravitational Waves, Amaldi 9 and the 2011 Numerical Relativity - Data Analysis Meeting, NRDA 2011 - Cardiff, United Kingdom Duration: 2011 Jul 10 → 2011 Jul 15 |

### ASJC Scopus subject areas

- Physics and Astronomy(all)

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## Cite this

*Journal of Physics: Conference Series*,

*363*(1), [012017]. https://doi.org/10.1088/1742-6596/363/1/012017