東京大学 大学院理学系研究科 物理学専攻 助教
Assistant Professor, Department of Physics, University of Tokyo
重力波望遠鏡の研究開発や、そのレーザー干渉計技術を利用したローレンツ不変性の検証実験、巨視的量子力学の検証実験などを行っています。
My research is focused on instrument science and astronomy of gravitational waves. My work also involves experiments to test Lorentz invariance and macroscopic quantum mechanics with laser interferometry.
ミリグラムスケールの光学機械系を用いた実験のレビュー論文を執筆しました。その論文で、単振り子、ねじれ振り子、光学浮上鏡をそれぞれ量子状態に持っていく可能性について比較検討しました。The European Physical Journal Dの、重力物理のための量子技術についてまとめる特集に掲載されました。
We studied how different upgrade technologies improve the sensitivity of KAGRA at various detector bands. Our study paves the way to designing future cryogenic gravitational wave detectors for various astrophysical targets. My paper was published in Physical Review D.
I gave a talk on ultralight dark matter searches with laser interferometric gravitational wave detectors at the seminar organized by Riken iTHEMS Dark Matter Working Group.
We wrote a review paper on milligram scale optomechanical systems. We compared the feasibility of reaching the quantum regime with a pendulum, torsion pendulum, and optically levitated mirror. The paper was published in The European Physical Journal D as a contribution to the Topical Issue on "Quantum Technologies for Gravitational Physics."
We invented a new method to optimize quantum noise of the interferometer which employs quantum locking technique. The joint paper was published in Physics Letters A.
The Japanese book on relativity and universe was published from Asakura Publishing. I wrote sections on the test of the invariance of the speed of light and various ways for gravitational wave observation.
We wrote a paper overviewing the detector design and status of KAGRA. It was submitted to Progress of Theoretical and Experimental Physics for an issue focusing on gravitational waves.
Proceedings papers for TAUP2019 on DANCE project to search for axion dark matter with optical ring cavity, and the project to search for axion dark matter with interferometric gravitational wave detectors were published in Journal of Physics: Conference Series.
January 2020 issue of Rigakubu News was published. I wrote an article on axion dark matter detection with laser interferometric gravitational wave detectors.
We have succeeded in developing a 10-mg torsion pendulum which has the best torque sensitivity as a miligram scale torsion pendulum. Such a massive optomechanical device can shed light on macroscopic quantum mechanics and gravitational physics. The joint paper was published in Physical Review A.
I attended the Global Young Scientists Summit 2020 in Singapore. Around 280 young researchers are nominated and gathered around the world. See this YouTube video for highlights.
We have developed an arm length stabilization system for KAGRA, and successfully demonstrated the lock acquisition of the arm cavities. Our new scheme is scalable to future longer baseline gravitational wave detectors. The joint paper was published in Classical and Quantum Gravity.
I gave an invited lecture on various searches for non-standard physics with laser interferometers at The First School on Quantum Sensors for Fundamental Physics, Durham University.
Proceedings paper for TAUP2017 on the status of KAGRA was finally published in Journal of Physics: Conference Series. I wrote the manuscript as a corresponding author in 2017.
I gave a seminar on optical levitation of a mirror for probing macroscopic quantum mechanics at Iwamoto Lab, the Institute of Industrial Science, University of Tokyo.
Our research on axion search with gravitational wave detectors was featured on the official YouTube channel of the School of Science, University of Tokyo.
We have estimated the effect of substrate inhomogeneity of KAGRA sapphire mirrors to the performance of KAGRA as a gravitational wave telescope, using interferometer simulations. The joint paper was published in Physical Review D.
I gave an invited talk on the status and future prospects of KAGRA at Multi-dimensional Modeling and Multi-Messenger observation from Core-Collapse Supernovae, Fukuoka University.
I gave a seminar on laser interferometric gravitational wave detectors and macroscopic quantum mechanics at Institute of Cosmophysics, Kobe University.
We have designed and developed a laser modulation system which enables a low noise control of interferometric gravitational wave detectors, and successfully demonstrated the proof-of-principle. The joint paper was published in Classical and Quantum Gravity.
We proposed a new method to search for axion dark matter using an optical linear cavity. Our method can be applied to linear cavities used in interferometric gravitational wave detectors and axion search can be done simultaneously with gravitational wave observations. The joint paper was published in Physical Review Letters, and featured in UTokyo FOCUS.
We have found that separation of gravitational wave polarizations is possible with future gravitational wave detectors even if the number of detectors is less than number of polarization modes. This is because the orientation of the detector will change significantly during the observation of gravitational waves from compact binaries. The joint paper was published in Physical Review D.
I gave invited lectures on laser interferometry for gravitational wave observations at the summer school held at TianQin Research Center, Sun Yat-sen University.
I wrote a paper presenting results from KAGRA's first cryogenic test operation in April and May 2018 as one of the corresponding authors. The paper was published in Classical and Quantum Gravity. The paper was featured in Science News magazine article.
Our research on mg-scale gravity sensor with Tohoku University was featured on the official YouTube channel of the School of Science, University of Tokyo.
We had The 1st QFilter Workshop at Laboratoire Kastler Brossel, Paris. I gave a talk on optical levitation of a mirror. QFilter project is France-Japan joint research project which started last year.
I gave invited lectures on interferometric gravitational wave observations at the 3rd Workshop on Gravity and Cosmology by Young Researchers at Kyoto University.
We have developed a 7-mg suspended mirror which has enough displacement sensitivity to probe mg-scale gravity. The demonstration paves the way to probe gravitational coupling between masses in quantum regimes. The joint paper was published in Physical Review Letters, and featured in Physics.
I gave an invited talk on the status of KAGRA at the Conference on Multi-messenger Astronomy in the Era of LIGO-India, Khandala. I also had an interview with LIGO-India Education and Public Outreach team.
We proposed a new method to search for axion dark matter using an optical ring cavity. Compared with previous methods, the sensitivity can be improved by several orders of magnitude. The joint paper was published in Physical Review Letters.
We studied the separability of non-tensorial polarizations of gravitational waves from compact binary coalescences. We showed that the number of detectors should be at least as much as the number of the polarizations to distinguish the polarizations. The joint paper was published in Physical Review D.
Using particle swarm optimization, we showed that the detection range and the sky localization of binary neutron stars by KAGRA can be further improved. Our results clearly showed that particle swarm optimization is useful for designing the sensitivity of cryogenic gravitational wave detectors. My paper was published in Physical Review D.
We succeeded in formalizing a method for calculating suspension thermal noise under non-uniform temperature. The joint paper was published in Physical Review D.
We systematically investigated seismic cross-coupling noise in torsion pendulums and experimentally confirmed our model. We also succeeded in actually reducing the noise. The joint paper was published in Physical Review D.
Observing scenario paper by LIGO, Virgo and KAGRA was published in Living Reviews in Relativity. The paper summarizes the observation plans of each detector and prospects for sky localization of binary neutron stars.
KAGRA collaboration paper on the construction and the first test operation in March and April 2016 was published in PTEP. I mainly wrote Section 5.1, which describes the details of the first test run.
We developed an interferometer control model and successfully designed the actuation parameters for all the KAGRA mirrors to have sufficient force range as well as to have sufficiently small noise. My paper was published in Classical and Quantum Gravity.
I gave a seminar talk on the status and future prospects of gravitational wave observations at Research Center for Neutrino Science, Tohoku University.
We proposed a new method to optically levitate a mg-scale mirror, and showed that reaching the standard quantum limit is feasible with this method. My paper was published in Optics Express.