Improving parameter estimation accuracy with torsion-bar antennas

Kazunari Eda, Ayaka Shoda, Yousuke Itoh, and Masaki Ando
Phys. Rev. D 90, 064039 – Published 22 September 2014

Abstract

We propose a new antenna configuration of a torsion-bar antenna (TOBA) and study its performance. A TOBA is a novel type of an antenna for low-frequency gravitational waves (GWs) which consists of two bar-shaped orthogonal test masses. Previously only the rotation of the bars on the horizontal plane had been considered as an output signal. In this paper, we introduce a new antenna configuration for a TOBA to incorporate two additional outputs by measuring the rotation of the bars on the vertical planes. Such a triple-output TOBA can be regarded as a network of three coincident but misaligned interferometric detectors. The target sensitivity we consider in this paper is about 3×1020Hz1/2 at 1 Hz. Since the triple-output TOBA is sensitive to all directions of GWs, event detection rates are improved by a factor of 1.7. It also increases the parameter resolution drastically for short-duration observations because the triple-output TOBA has three independent output signals and can discriminate two polarization modes of a short-duration GW signal even with single antenna. For instance, in the case of a 104104 IMBH merger at 100 Mpc, the source location is typically measurable with an accuracy of ±0.010.1 steradians which is roughly two order of magnitude better than the conventional single-output TOBA.

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  • Received 4 July 2014

DOI:https://doi.org/10.1103/PhysRevD.90.064039

© 2014 American Physical Society

Authors & Affiliations

Kazunari Eda1,2,*, Ayaka Shoda1,†, Yousuke Itoh2,‡, and Masaki Ando1,2,3,§

  • 1Department of Physics, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan
  • 2Research center for the early universe (RESCEU), Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan
  • 3Gravitational Wave Project Office, Optical and Infrared Astronomy Division, National Astronomical Observatory, Osawa 2-21-1, Mitaka, Tokyo 181-8588, Japan

  • *eda@resceu.s.u-tokyo.ac.jp
  • shoda@granite.phys.s.u-tokyo.ac.jp
  • yousuke_itoh@resceu.s.u-tokyo.ac.jp
  • §ando@phys.s.u-tokyo.ac.jp

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Issue

Vol. 90, Iss. 6 — 15 September 2014

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