Search for a stochastic gravitational-wave background using a pair of torsion-bar antennas

Ayaka Shoda, Masaki Ando, Koji Ishidoshiro, Kenshi Okada, Wataru Kokuyama, Yoichi Aso, Kimio Tsubono

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We have set a new upper limit on the stochastic gravitational-wave background using two prototype torsion-bar antennas (TOBAs). A 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 Ωgwh02<1.9×1017 at 0.035-0.830 Hz, where h0 is the Hubble constant in units of 100 km/s/Mpc and Ωgw 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.

Original languageEnglish
Article number027101
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume89
Issue number2
DOIs
Publication statusPublished - 2014 Jan 22

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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