Torsion-Bar Antenna for Low-Frequency Gravitational-Wave Observations

Ando, Masaki; Ishidoshiro, K.; Yamamoto, K.; Yagi, Kent; Kokuyama, Wataru; Tsubono, K.; Takamori, A.

doi:10.1103/physrevlett.105.161101

Cited by 69 publications

(81 citation statements)

References 30 publications

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“…which leads to 1/Ω q ≈ 28 s (8.9) which might be achievable on the ground with the help of torsional bars at the quantum regime [260]. However, due to the lack of a mathematical formulation for gravity docoherence, it is not easy to work out the exact density to use from first principle.…”

Section: Quantum Mechanics and Gravitymentioning

confidence: 99%

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Chen¹

2013

J. Phys. B: At. Mol. Opt. Phys.

274

302

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Abstract. Rapid experimental progress has recently allowed the use of light to prepare macroscopic mechanical objects into nearly pure quantum states. This research field of quantum optomechanics opens new doors toward testing quantum mechanics, and possibly other laws of physics, in new regimes. In the first part of this paper, I will review a set of techniques of quantum measurement theory that are often used to analyze quantum optomechanical systems. Some of these techniques were originally designed to analyze how a classical driving force passes through a quantum system, and can eventually be detected with optimal signal-to-noise ratio -while others focus more on the quantum state evolution of a mechanical object under continuous monitoring. In the second part of this paper, I will review a set of experimental concepts that will demonstrate quantum mechanical behavior of macroscopic objects -quantum entanglement, quantum teleportation, and the quantum Zeno effect. Taking the interplay between gravity and quantum mechanics as an example, I will review a set of speculations on how quantum mechanics can be modified for macroscopic objects, and how these speculations -and their generalizations -might be tested by optomechanics.

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Section: Quantum Mechanics and Gravitymentioning

confidence: 99%

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Chen¹

2013

J. Phys. B: At. Mol. Opt. Phys.

274

302

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“…Furthermore, future ground-based detectors have been proposed, such as the Einstein Telescope (ET Science Team 2011) with even more enhanced strain sensitivity, and a detection band extending down to a few Hz. In parallel to these kilometre-scale detectors, groups are developing gravity strainmeters targeting signals below 1 Hz, which are better suited to detect gravity perturbations changing over timescales of a few seconds (Ando et al 2010;Hohensee et al 2011;Dickerson et al 2013;Shoda et al 2014).…”

Section: Motivationsmentioning

confidence: 99%

Transient gravity perturbations induced by earthquake rupture

Harms

Ampuero

Barsuglia

et al. 2015

Geophysical Journal International

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S U M M A R YThe static and transient deformations produced by earthquakes cause density perturbations which, in turn, generate immediate, long-range perturbations of the Earth's gravity field. Here, an analytical solution is derived for gravity perturbations produced by a point double-couple source in homogeneous, infinite, non-self-gravitating elastic media. The solution features transient gravity perturbations that occur at any distance from the source between the rupture onset time and the arrival time of seismic P waves, which are of potential interest for real-time earthquake source studies and early warning. An analytical solution for such prompt gravity perturbations is presented in compact form. We show that it approximates adequately the prompt gravity perturbations generated by strike-slip and dip-slip finite fault ruptures in a half-space obtained by numerical simulations based on the spectral element method. Based on the analytical solution, we estimate that the observability of prompt gravity perturbations within 10 s after rupture onset by current instruments is severely challenged by the background microseism noise but may be achieved by high-precision gravity strainmeters currently under development. Our analytical results facilitate parametric studies of the expected prompt gravity signals that could be recorded by gravity strainmeters.

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“…The horizontal angular motion of the test mass 1 shown in Fig. 1, θ 1 obeys the equation of motion [1]:…”

Section: New Antenna Configuration a Setupmentioning

confidence: 99%

“…A torsion-bar Antenna (TOBA) is a gravitational-wave (GW) detector with two bar-shaped test masses which rotate differentially by the tidal force of GWs [1][2][3][4]. The main feature of the TOBA is that it has good sensitivity at low frequencies around 1 Hz even on the ground because of its low resonant frequency of the test masses in the rotational degrees of freedom.…”

Section: Introductionmentioning

confidence: 99%

Improving parameter estimation accuracy with torsion-bar antennas

et al. 2014

Self Cite

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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 output signals. 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. We investigate its event detection rate and its parameter accuracies using Fisher analysis. We find that since the triple-output TOBA can discriminate two polarization modes of a short-duration GW signal even with a single antenna thanks to having three independent outputs, it improves the detection rate and the accuracies of waveform parameters drastically.

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Torsion-Bar Antenna for Low-Frequency Gravitational-Wave Observations

Cited by 69 publications

References 30 publications

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Macroscopic quantum mechanics: theory and experimental concepts of optomechanics

Transient gravity perturbations induced by earthquake rupture

Improving parameter estimation accuracy with torsion-bar antennas

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