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

Koji Ishidoshiro, Masaki Ando, Akiteru Takamori, Hirotaka Takahashi, Kenshi Okada, Nobuyuki Matsumoto, Wataru Kokuyama, Nobuyuki Kanda, Yoichi Aso, and Kimio Tsubono
Phys. Rev. Lett. 106, 161101 – Published 20 April 2011
Physics logo See Synopsis: Tuning in to gravity

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)<4.3×1017 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 (106104Hz).

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  • Received 30 November 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.161101

© 2011 American Physical Society

Synopsis

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Tuning in to gravity

Published 20 April 2011

Tests of an early design for a gravity-wave detector determine sensitivity limits in a new frequency window.

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Authors & Affiliations

Koji Ishidoshiro1,*, Masaki Ando2, Akiteru Takamori3, Hirotaka Takahashi3,4, Kenshi Okada1, Nobuyuki Matsumoto1, Wataru Kokuyama1, Nobuyuki Kanda5, Yoichi Aso1, and Kimio Tsubono1

  • 1Department of Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
  • 2Department of Physics, Kyoto University, Kyoto 606-8502, Japan
  • 3Earthquake Research Institute, University of Tokyo, Bunkyo-Ku, Tokyo 113-0032, Japan
  • 4Department of Humanities, Yamanashi Eiwa College, Kofu, Yamanashi 400-8555, Japan
  • 5Department of Physics, Osaka City University, Osaka 558-8585, Japan

  • *Present address: High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801, Japan. koji@post.kek.jp

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Issue

Vol. 106, Iss. 16 — 22 April 2011

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