Article
Astronomy & Astrophysics
Atsushi Nishizawa, Shoki Iwaguchi, Yanbei Chen, Taigen Morimoto, Tomohiro Ishikawa, Bin Wu, Izumi Watanabe, Yuki Kawasaki, Ryuma Shimizu, Hirohiko Shimizu, Masaaki Kitaguchi, Yuta Michimura, Seiji Kawamura
Summary: This paper proposes a neutron displacement noise-free interferometer that utilizes neutrons instead of light to lower the sensitive frequency band, making it capable of detecting gravitational waves inaccessible by ordinary laser interferometers.
Article
Physics, Multidisciplinary
Shoki Iwaguchi, Atsushi Nishizawa, Yanbei Chen, Yuki Kawasaki, Masaaki Kitaguchi, Taigen Morimoto, Tomohiro Ishikawa, Bin Wu, Izumi Watanabe, Ryuma Shimizu, Hirohiko Shimizu, Yuta Michimura, Seiji Kawamura
Summary: The improvement of sensitivity to gravitational waves at lower frequencies remains challenging due to displacement noise. A neutron displacement-noise-free interferometer is proposed as a solution. By adjusting the neutron speed, the detector configuration is simplified to a single Mach-Zehnder interferometer with two beamsplitters and two mirrors. In this configuration, all displacement noise is canceled in the frequency domain, which is explained intuitively using a phasor diagram.
Article
Optics
Ruihong Gao, Yikun Wang, Zhao Cui, Heshan Liu, Anwei Liu, Xingguang Qian, Xue Wang, Zhixiong Yao, Qiujie Yang, Jianjun Jia, Keqi Qi, Shaoxin Wang, Ziren Luo, Gang Jin, Jianyu Wang
Summary: This article introduces a method for establishing a laser link between satellites, using star trackers, cameras, and QPDs to achieve ultra-high pointing precision requirements. The feasibility of this method is confirmed through verification with a ground experimental system.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Astronomy & Astrophysics
Aleksandra Piorkowska-Kurpas, Shaoqi Hou, Marek Biesiada, Xuheng Ding, Shuo Cao, Xilong Fan, Seiji Kawamura, Zong-Hong Zhu
Summary: The emergence of gravitational wave astronomy has sparked interest in exploring the low-frequency GW spectrum, leading to the development of satellite observatories like DECIGO and B-DECIGO to cover this range. Population synthesis methods were used to forecast detection rates and gravitational lensing rates, demonstrating the potential significance of these observatories in the field of GW astronomy.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
M. Lopez, I Di Palma, M. Drago, P. Cerda-Duran, F. Ricci
Summary: By using machine learning techniques, we successfully detected signals from core-collapse supernova explosions in real data, with the detection efficiency and false alarm rate calculated based on the signal-to-noise ratio. This method showed high effectiveness and sensitivity during the O2 observation period.
Article
Chemistry, Analytical
Nikolai Petrov, Vladislav Pustovoit
Summary: A compact tabletop laser interferometer with Fabry-Perot resonators is proposed for detecting gravitational waves, achieving high spectral resolution of 10(-23) cm(-1) at a short distance of 1-3 m between mirrors. The interferometer is more sensitive to shorter-wave laser radiation, and a method based on measuring the correlation function of radiation intensities is suggested for detecting gravitational waves.
Article
Astronomy & Astrophysics
Riccardo DeSalvo, Jeremy Blow, Claudio Pineda Bosque, Stefano Selleri
Summary: The third generation of gravitational wave detectors, such as the Einstein telescope, introduce some innovations in design, such as using a 60-degree angle between the arms and installing beam expander telescopes with angled mirrors inside the interferometer to address issues with beam and beam splitter sizes and optimize recombination angle to 90 degrees.
CLASSICAL AND QUANTUM GRAVITY
(2022)
Article
Physics, Multidisciplinary
Shoki Iwaguchi, Atsushi Nishizawa, Yanbei Chen, Yuki Kawasaki, Tomohiro Ishikawa, Masaaki Kitaguchi, Yutaka Yamagata, Bin Wu, Ryuma Shimizu, Kurumi Umemura, Kenji Tsuji, Hirohiko Shimizu, Yuta Michimura, Seiji Kawamura
Summary: To detect gravitational waves more effectively, it is important to develop a technique for reducing mirror displacement noise in ground-based detectors at low frequencies. The neutron displacement-noise-free interferometer (DFI) is a tool that can minimize mirror displacement noise in the lower frequency range. This paper presents a simplified configuration of the neutron DFI based on the direction of neutron incidence. Unlike the previous configuration, which involved bidirectional incidences at two speeds, the new configuration allows unidirectional neutron incidence at four speeds. This simplification is crucial for proof-of-principle experiments.
Article
Astronomy & Astrophysics
Paraskevi Nousi, Alexandra E. Koloniari, Nikolaos Passalis, Panagiotis Iosif, Nikolaos Stergioulas, Anastasios Tefas
Summary: Traditionally, gravitational waves are detected using techniques such as matched filtering or wavelet-based unmodeled searches. However, when it comes to generic black hole binaries with nonaligned spins, exploring the entire parameter space using matched filtering can be impractical. In this study, a novel combination of machine-learning algorithms is used to achieve higher sensitivity and computational efficiency compared to traditional techniques.
Article
Astronomy & Astrophysics
D. Bhattacharjee, Y. Lecoeuche, S. Karki, J. Betzwieser, V Bossilkov, S. Kandhasamy, E. Payne, R. L. Savage
Summary: As sensitivity and reliability of detectors in the global network of gravitational wave observatories increase, the importance of calibration accuracy and precision also grows. By using photon calibrators that rely on power-modulated auxiliary laser beams, continuous calibration with improved accuracy in generating length fiducials has been achieved. Efforts to reduce relative calibration errors between elements of the detector network are ongoing through referencing the laser power calibration standards to a single transfer standard.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
J. F. Rodriguez, J. A. Rueda, R. Ruffini, J. I. Zuluaga, J. M. Blanco-Iglesiasi, P. Loren-Aguilari
Summary: We find that the frequency-amplitude evolution of chirping ellipsoids is similar to that emitted by double white dwarfs and EMRIs, posing a challenge for space-based GW detectors to detect and differentiate these systems.
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
(2023)
Article
Astronomy & Astrophysics
A. P. Spencer, B. W. Barr, A. S. Bell, J. Briggs, P. Dupej, S. H. Huttner, B. Sorazu, J. Wright, K. A. Strain
Summary: The polarisation Sagnac speedmeter interferometer shows promise as a replacement for the Michelson interferometer in future ground-based gravitational wave detectors. The quality of polarisation optics, including the polarisation beam-splitter and quarter-waveplate, along with consideration of birefringence effects, are crucial for the quantum noise benefits of this speedmeter. The leading limitation for the polarisation Sagnac speedmeter in terms of polarisation effects is the extinction ratio of the PBS, which can be impacted by careful adjustment of the QWP angle.
CLASSICAL AND QUANTUM GRAVITY
(2021)
Article
Astronomy & Astrophysics
James W. Gardner, Min Jet Yap, Vaishali Adya, Sheon Chua, Bram J. J. Slagmolen, David E. McClelland
Summary: This study aims to enhance the sensitivity of interferometric gravitational-wave detectors through nondegenerate internal squeezing. The research shows that this all-optical technique is stable and tolerant to decoherence from optical detection loss, making broadband sensitivity enhancement feasible.
Article
Astronomy & Astrophysics
Quentin Baghi, James Ira Thorpe, Jacob Slutsky, John Baker
Summary: LISA, the future space-based gravitational wave observatory, relies on the cancellation of laser frequency noise for its success. Time-delay interferometry (TDI) is the standard technique, and PCI provides a comprehensive and efficient way to analyze LISA data.
Review
Physics, Multidisciplinary
I. H. Park
Summary: Multi-wavelength observations are crucial for understanding the universe through gravitational wave astronomy, with space experiments offering a new frequency range for observation. These experiments allow for the study of unexplored parameter space, producing complementary results that enhance our knowledge of gravitational waves.
JOURNAL OF THE KOREAN PHYSICAL SOCIETY
(2021)