2014/06/27 by Kazunari Eda, A. Shoda, Ayaka Shoda +3
Physics and Astronomy · #Antenna (radio) #Artificial intelligence #Astrophysics #Bar (unit) #Computer science #Detector #Gamma-ray bursts and supernovae #Gravitational wave #Interferometry #Optics #Physics #Polarization (electrochemistry) #Pulsars and Gravitational Waves Research #Radio Astronomy Observations and Technology #Rotation (mathematics) #Telecommunications #Torsion (gastropod) #gr-qc
paper · pdf · doi:10.1103/physrevd.90.064039
published as Phys. Rev. D 90, 064039 (2014) · 14 pages, 6 figures
arxiv created 2014/06/27 · openalex publication_date 2014/09/22 · arxiv updated 2014/10/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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\ifmmode×\else\texttimes\fi10^\ensuremath-20 Hz^\ensuremath-1/2 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 104\text\ensuremath-104 IMBH merger at 100 Mpc, the source location is typically measurable with an accuracy of \ifmmode±\else\textpm\fi0.01\text\ensuremath-0.1 steradians which is roughly two order of magnitude better than the conventional single-output TOBA.