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, Kimio Tsubono

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37 Citations (Scopus)

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 0.2Hz 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 100Hz) and the Cassini band (10-6-10 -4Hz).

Original languageEnglish
Article number161101
JournalPhysical Review Letters
Volume106
Issue number16
DOIs
Publication statusPublished - 2011 Apr 20
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Ishidoshiro, K., Ando, M., Takamori, A., Takahashi, H., Okada, K., Matsumoto, N., Kokuyama, W., Kanda, N., Aso, Y., & Tsubono, K. (2011). Upper limit on gravitational wave backgrounds at 0.2 Hz with a torsion-bar antenna. Physical Review Letters, 106(16), [161101]. https://doi.org/10.1103/PhysRevLett.106.161101