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3G R&D: R&D for the Next Generation of Ground-based Gravitational-wave Detectors
David McClelland, Harald Lueck, Rana Adhikari +43
To deliver on the promise of next generation gravitational-wave observatories, a sustained and coordinated detector research and development program is required. This report examin…
Search for anisotropic gravitational-wave backgrounds using data from Advanced LIGO and Advanced Virgo's first three observing runs
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1589
We report results from searches for anisotropic stochastic gravitational-wave backgrounds using data from the first three observing runs of the Advanced LIGO and Advanced Virgo det…
Constraints on cosmic strings using data from the third Advanced LIGO-Virgo observing run
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1586
We search for gravitational-wave signals produced by cosmic strings in the Advanced LIGO and Virgo full O3 data set. Search results are presented for gravitational waves produced b…
Reduction of quantum noise using the quantum locking with an optical spring for gravitational wave detectors
Rika Yamada, Yutaro Enomoto, Izumi Watanabe +11
In our previous research, simulation showed that a quantum locking scheme with homodyne detection in sub-cavities is effective in surpassing the quantum noise limit for Deci-hertz…
Quantum noise in a Fabry-Perot interferometer including the influence of diffraction loss of light
Shoki. Iwaguchi, Tomohiro. Ishikawa, Masaki. Ando +10
The DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is designed to detect gravitational waves at frequencies between 0.1 and 10 Hz. In this frequency band, one of…
Improvement of the target sensitivity in DECIGO by optimizing its parameters for quantum noise including the effect of diffraction loss
Tomohiro Ishikawa, Shoki Iwaguchi, Yuta Michimura +10
DECIGO is the future Japanese gravitational wave detector in outer space. We previously set the default design parameters to provide a good target sensitivity to detect the primord…
Overview of KAGRA : KAGRA science
KAGRA Collaboration, T. Akutsu, M. Ando +240
KAGRA is a newly build gravitational-wave observatory, a laser interferometer with 3 km arm length, located in Kamioka, Gifu, Japan. In this paper in the series of KAGRA-featured a…
Prospects for improving the sensitivity of the cryogenic gravitational wave detector KAGRA
Yuta Michimura, Kentaro Komori, Yutaro Enomoto +18
Upgrades to improve the sensitivity of gravitational wave detectors enable more frequent detections and more precise source parameter estimation. Unlike other advanced interferomet…
Optimization of quantum noise by completing the square of multiple interferometer outputs in quantum locking for gravitational wave detectors
Rika Yamada, Yutaro Enomoto, Atsushi Nishizawa +11
The quantum locking technique, which uses additional short low-loss sub-cavities, is effective in reducing quantum noise in space gravitational wave antenna DECIGO. However, the qu…
Prospects for improving the sensitivity of KAGRA gravitational wave detector
Yuta Michimura, Masaki Ando, Eleonora Capocasa +22
KAGRA is a new gravitational wave detector which aims to begin joint observation with Advanced LIGO and Advanced Virgo from late 2019. Here, we present KAGRA's possible upgrade pla…
Prospects for gravitational-wave polarization test from compact binary mergers with future ground-based detectors
Hiroki Takeda, Atsushi Nishizawa, Koji Nagano +4
There exist six possible polarization modes of gravitational waves in general metric theory of gravity, while two tensor polarization modes are allowed in general relativity. The p…
KAGRA: 2.5 Generation Interferometric Gravitational Wave Detector
T. Akutsu, M. Ando, K. Arai +188
The recent detections of gravitational waves (GWs) reported by LIGO/Virgo collaborations have made significant impact on physics and astronomy. A global network of GW detectors wil…
Polarization test of gravitational waves from compact binary coalescences
Hiroki Takeda, Atsushi Nishizawa, Yuta Michimura +4
Gravitational waves have only two polarization modes in General Relativity. However, there are six possible modes of polarization in metric theory of gravity in general. The tests…
Particle swarm optimization of the sensitivity of a cryogenic gravitational wave detector
Yuta Michimura, Kentaro Komori, Atsushi Nishizawa +6
Cryogenic cooling of the test masses of interferometric gravitational wave detectors is a promising way to reduce thermal noise. However, cryogenic cooling limits the incident powe…
A Direct Approach for the Fluctuation-Dissipation Theorem under Non-Equilibrium Steady-State Conditions
Kentaro Komori, Yutaro Enomoto, Hiroki Takeda +4
The test mass suspensions of cryogenic gravitational-wave detectors such as the KAGRA project are tasked with extracting the heat deposited on the optics. Thus these suspensions ha…
Construction of KAGRA: an Underground Gravitational Wave Observatory
T. Akutsu, M. Ando, S. Araki +222
Major construction and initial-phase operation of a second-generation gravitational-wave detector KAGRA has been completed. The entire 3-km detector is installed underground in a m…
Ground Based Low-Frequency Gravitational-wave Detector With Multiple Outputs
Ayaka Shoda, Yuya Kuwahara, Masaki Ando +4
We have developed a new gravitaional-wave (GW) detector, TOrsion-Bar Antenna (TOBA), with multiple-output configuration. TOBA is a detector with bar-shaped test masses that rotate…
Search for a stochastic gravitational wave background at 1-5 Hz with Torsion-bar Antenna
Yuya Kuwahara, Ayaka Shoda, Kazunari Eda +1
We set the first upper limit on the stochastic gravitational wave (GW) background in the frequency range of using a Torsion-bar Antenna (TOBA). A TOBA is a GW de…
Higher order test of Lorentz invariance with an optical ring cavity
Yuta Michimura, Jake Guscott, Matthew Mewes +5
We have developed an apparatus to search for the higher-order Lorentz violation in photons by measuring the resonant frequency difference between two counterpropagating directions…
All-sky coherent search for continuous gravitational waves in 6-7 Hz band with a torsion-bar antenna
Kazunari Eda, Ayaka Shoda, Yuya Kuwahara +2
A torsion-bar antenna (TOBA) is a low-frequency terrestrial gravitational wave (GW) antenna which consists of two orthogonal bar-shaped test masses. We upgraded the prototype TOBA…
Improving parameter estimation accuracy with torsion-bar antennas
Kazunari Eda, Ayaka Shoda, Yousuke Itoh +1
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) w…
Torsion bar antenna in the proper reference frame with rotation
Kouji Nakamura, Masaki Ando
The resultant response of the rotating torsion bar antenna for gravitational waves discussed in [M. Ando et al., Phys. Rev. Lett. {\bf 105} (2010), 161101.] is re-investigate from…
Search for a Stochastic Gravitational-wave Background using a pair of Torsion-bar Antennas
Ayaka Shoda, Masaki Ando, Koji Ishidoshiro +4
We have set a new upper limit on the stochastic gravitational wave background (SGWB) using two prototype Torsion-bar Antennas (TOBAs). TOBA is a low-frequency gravitational-wave de…
Optical-Cavity Limits on Higher-Order Lorentz Violation
Yuta Michimura, Matthew Mewes, Nobuyuki Matsumoto +2
An optical ring cavity is used to place the first laboratory constraints on parity-odd nonrenormalizable Lorentz violation. Variations in resonant frequencies are limited to parts…