output
20082021
most citedRelative information entropy and Weyl curvature of the inhomogeneous Universe

22 citations

10 papers

math.DG2021★ 6 cited

Generalised Bianchi permutability for isothermic surfaces

Joseph Cho, Katrin Leschke, Yuta Ogata

Isothermic surfaces are surfaces which allow a conformal curvature line parametrisation. They form an integrable system, and Darboux transforms of isothermic surfaces obey Bianchi…

astro-ph.IM2020★ 8 cited

Low-Energy X-ray Performance of SOI Pixel Sensors for Astronomy, "XRPIX"

Ryota Kodama, Takeshi Go Tsuru, Takaaki Tanaka +17

We have been developing a new type of X-ray pixel sensors, "XRPIX", allowing us to perform imaging spectroscopy in the wide energy band of 1-20 keV for the future Japanese X-ray sa…

astro-ph.IM2019★ 3 cited

Subpixel Response of SOI Pixel Sensor for X-ray Astronomy with Pinned Depleted Diode: First Result from Mesh Experiment

Kazuho Kayama, Takeshi G. Tsuru, Takaaki Tanaka +31

We have been developing a monolithic active pixel sensor, ``XRPIX``, for the Japan led future X-ray astronomy mission ``FORCE`` observing the X-ray sky in the energy band of 1-80 k…

astro-ph.IM2019★ 8 cited

Evaluation of Kyoto's Event-Driven X-ray Astronomical SOI Pixel Sensor with a Large Imaging Area

Hideki Hayashi, Takeshi Go Tsuru, Takaaki Tanaka +23

We have been developing monolithic active pixel sensors, named ``XRPIX'', based on the silicon-on-insulator (SOI) pixel technology for future X-ray astronomy satellites. XRPIX has…

astro-ph.IM2018★ 21 cited

Performance of the Silicon-On-Insulator Pixel Sensor for X-ray Astronomy, XRPIX6E, Equipped with Pinned Depleted Diode Structure

Sodai Harada, Takeshi Go Tsuru, Takaaki Tanaka +23

We have been developing event driven X-ray Silicon-On-Insulator (SOI) pixel sensors, called "XRPIX", for the next generation of X-ray astronomy satellites. XRPIX is a monolithic ac…

math.DG2018★ 2 cited

Analysis of timelike Thomsen surfaces - with deformations and singularities

Shintaro Akamine, Joseph Cho, Yuta Ogata

Timelike Thomsen surfaces are timelike minimal surfaces that are also affine minimal. In this paper, we make use of both the Lorentz conformal coordinates and the null coordinates,…

astro-ph.IM2018★ 11 cited

Kyoto's Event-Driven X-ray Astronomy SOI pixel sensor for the FORCE mission

Takeshi G. Tsuru, Hideki Hayashi, Katsuhiro Tachibana +23

We have been developing monolithic active pixel sensors, X-ray Astronomy SOI pixel sensors, XRPIXs, based on a Silicon-On-Insulator (SOI) CMOS technology as soft X-ray sensors for…

math.DG2018★ 3 cited

Deformation and singularities of maximal surfaces with planar curvature lines

Joseph Cho, Yuta Ogata

Minimal surfaces with planar curvature lines in the Euclidean space have been studied since the late 19th century. On the other hand, the classification of maximal surfaces with pl…

gr-qc2012★ 22 cited

Relative information entropy and Weyl curvature of the inhomogeneous Universe

Nan Li, Thomas Buchert, Akio Hosoya +2

Penrose conjectured a connection between entropy and Weyl curvature of the Universe. This is plausible, as the almost homogeneous and isotropic Universe at the onset of structure f…

math.NT2008★ 1 cited

On the -free divisor problem

Jun Furuya, Wenguang Zhai

Let denote the error term of the -free divisor problem for . In this paper we establish an asymptotic formula of the integral fo…