Improving parameter estimation accuracy with torsion-bar antennas
Improving parameter estimation accuracy with torsion-bar antennas
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利用扭杆天线提高参数估计精度
DOI：
10.1103/physrevd.90.064039
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发表时间：
2014
影响因子：
5
通讯作者：
M. Ando
中科院分区：
文献类型：
--
作者：
K. Eda;A. Shoda;Y. Itoh;M. Ando
本文提出了一种扭杆天线的新结构，并研究了其性能。TOBA天线是一种新型的低频引力波天线，它由两个正交的测试质量块组成。以前，只有水平平面上的杆的旋转被认为是输出信号。在本文中，我们介绍了一种新的天线配置的TOBA，将两个额外的输出，通过测量垂直平面上的酒吧的旋转。这种三输出TOBA可以被视为三个重合但未对准的干涉检测器的网络。本文考虑的目标灵敏度约为1Hz。由于三输出TOBA对GW的所有方向都敏感，因此事件检测率提高了1.7倍。它还大大提高了短期观测的参数分辨率，因为三输出TOBA具有三个独立的输出信号，即使用单天线也可以区分短期GW信号的两种偏振模式。例如，在100 Mpc的aIMBH合并的情况下，源位置通常以球面度的精度测量，这比传统的单输出TOBA好大约两个数量级。
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 aboutat 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 aIMBH merger at 100 Mpc, the source location is typically measurable with an accuracy ofsteradians which is roughly two order of magnitude better than the conventional single-output TOBA.