171 citations · 674 across the 14 of their papers we have counts for
14 papers
Axion clouds may survive the perturbative tidal interaction over the early inspiral phase of black hole binaries
Takuya Takahashi, Takahiro Tanaka
Gravitational wave observation has the potential of probing ultralight bosonic fields such as axion. Axion forms a cloud around a rotating black hole (BH) by superradiant instabili…
Renormalization group analysis of superradiant growth of self-interacting axion cloud
Hidetoshi Omiya, Takuya Takahashi, Takahiro Tanaka
There are strong interests in considering ultra-light scalar fields (especially axion) around a rapidly rotating black hole because of the possibility of observing gravitational wa…
Symmetry Preservation and Critical Fluctuations in a Pseudospin Crossover Perovskite LaCoO
Yasuhiro Shimizu, Takuya Takahashi, Syunpei Yamada +3
Spin-state crossover beyond a conventional ligand-field theory has been a fundamental issue in condensed matter physics. Here, we report microscopic observations of spin states and…
Quasi-periodic oscillations in flares and coronal mass ejections associated with magnetic reconnection
Takuya Takahashi, Jiong Qiu, Kazunari Shibata
We propose a mechanism for quasi-periodic oscillations of both coronal mass ejections (CMEs) and flare loops as related to magnetic reconnection in eruptive solar flares. We perfor…
Sheath-Accumulating Propagation of Interplanetary Coronal Mass Ejection
Takuya Takahashi, Kazunari Shibata
Fast interplanetary coronal mass ejections (interplanetary CMEs, or ICMEs) are the drivers of strongest space weather storms such as solar energetic particle events and geomagnetic…
Shock-Cloud Interaction in the Solar Corona
Takuya Takahashi
Flare associated coronal shock waves sometimes interact with solar prominences leading to large amplitude prominence oscillations. Such prominence activation gives us unique opport…
Scaling Relations in Coronal Mass Ejections and Energetic Proton Events associated with Solar Superflares
Takuya Takahashi, Yoshiyuki Mizuno, Kazunari Shibata
In order to discuss the potential impact of solar 'superflares' on space weather, we investigated statistical relations among energetic proton peak flux with energy higher than $ 1…
Prominence Activation by Coronal Fast Mode Shock
Takuya Takahashi, Ayumi Asai, Kazunari Shibata
An X5.4 class flare occurred in active region (AR) NOAA11429 on 2012 March 7. The flare was associated with very fast coronal mass ejection (CME) with its velocity of over 2500 km/…
Coronal magnetic field and the plasma beta determined from radio and multiple satellite observations
Kazumasa Iwai, Kiyoto Shibasaki, Satoshi Nozawa +5
We derived the coronal magnetic field, plasma density, and temperature from the observation of polarization and intensity of radio thermal free-free emission using the Nobeyama Rad…
Mass-scaling replica-exchange molecular dynamics optimizes computational resources with simpler algorithm
Tetsuro Nagai, Takuya Takahashi
We develop a novel method of replica-exchange molecular dynamics (REMD) simulation, mass-scaling REMD (MSREMD) method, which improves trajectory accuracy at high temperatures, and…
Magnetic Structures in Gamma-Ray Burst Jets Probed by Gamma-Ray Polarization
Daisuke Yonetoku, Toshio Murakami, Shuichi Gunji +10
We report polarization measurements in two prompt emissions of gamma-ray bursts, GRB 110301A and GRB 110721A, observed with the Gamma-ray burst polarimeter (GAP) aboard IKAROS sola…
Strict Limit on CPT Violation from Polarization of Gamma-Ray Bursts
Kenji Toma, Shinji Mukohyama, Daisuke Yonetoku +9
We report the strictest observational verification of CPT invariance in the photon sector, as a result of gamma-ray polarization measurement of distant gamma-ray bursts (GRBs), whi…
Detection of Gamma-Ray Polarization in Prompt Emission of GRB 100826A
Daisuke Yonetoku, Toshio Murakami, Shuichi Gunji +10
We report the polarization measurement in prompt -ray emission of GRB 100826A with the Gamma-Ray Burst Polarimeter (GAP) aboard the small solar power sail demonstrator IKAROS. W…
Gamma-Ray Burst Polarimeter - GAP - aboard the Small Solar Power Sail Demonstrator IKAROS
D. Yonetoku, T. Murakami, S. Gunji +9
The small solar power sail demonstrator "IKAROS" is a Japanese engineering verification spacecraft launched by H-IIA rocket on May 21, 2010 at JAXA Tanegashima Space Center. IKAROS…