76 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Shinshu UniversityJP17 papers
- Meiji Gakuin UniversityJP8 papers
- Ōtani UniversityJP3 papers
- Chiba UniversityJP2 papers
- Institute of Space and Astronautical ScienceJP2 papers
- Instituto Nacional de Pesquisas EspaciaisBR2 papers
- Japan Aerospace Exploration AgencyJP2 papers
- Kuwait UniversityKW2 papers
- Kyushu UniversityJP2 papers
- Moscow Institute of Physics and TechnologyRU2 papers
- Nagoya UniversityJP2 papers
- Public Authority for Applied Education and TrainingKW2 papers
33 papers
Group character averages via a single Laguerre
Alexei Morozov, Kazumi Okuyama
Average of exponential , i.e. of a group rather than an algebra character, in Gaussian matrix model is known to be an amusing generalization of Schur polynomial, wh…
Cap amplitudes in random matrix models
Kazumi Okuyama
For general one-matrix models in the large limit, we introduce the cap amplitude as the expansion coefficient of the 1-form on the spectral curve. We find that the…
Generalized Heisenberg Dynamics Revisited
Yoshiharu Kawamura
Taking as a model the fact that Heisenberg's matrix mechanics was derived from Hamiltonian mechanics using the correspondence principle, we explore a class of dynamical systems inv…
Papanicolaou Stain Unmixing for RGB Image Using Weighted Nucleus Sparsity and Total Variation Regularization
Nanxin Gong, Saori Takeyama, Masahiro Yamaguchi +3
The Papanicolaou stain, consisting of five dyes, provides extensive color information essential for cervical cancer cytological screening. The visual observation of these colors is…
Flavor structure from `canonical' Yukawa interactions and `emergent' kinetic terms
Yoshiharu Kawamura
We study the flavor structure of quarks in the standard model from a viewpoint of a canonical type of Yukawa interactions and an emergence of kinetic terms. A realistic structure c…
High temperature expansion of double scaled SYK
Kazumi Okuyama
We study the high temperature (or small inverse temperature ) expansion of the free energy of double scaled SYK model. We find that this expansion is a convergent series with a…
Correlators of double scaled SYK at one-loop
Kazumi Okuyama, Kenta Suzuki
In this paper, we study one-loop contributions in the double-scaling limit of the SYK model from the chord diagrams and Liouville type effective action. We compute and clarify the…
Late time behavior of -point spectral form factors in Airy and JT gravities
Takanori Anegawa, Norihiro Iizuka, Kazumi Okuyama +1
We study the late time behavior of -point spectral form factors (SFFs) in two-dimensional Witten-Kontsevich topological gravity, which includes both Airy and JT gravities as spe…
Hartle-Hawking wavefunction in double scaled SYK
Kazumi Okuyama
We compute the transition amplitude between the chord number and states in the double scaled SYK model and interpret it as a Hartle-Hawking wavefunction of the bulk grav…
Spectral form factor in the -scaling limit
Kazumi Okuyama, Kazuhiro Sakai
We study the spectral form factor (SFF) of general topological gravity in the limit of large time and fixed temperature. It has been observed recently that in this limit, called th…
Large expansion of an integrated correlator in SYM
Yasuyuki Hatsuda, Kazumi Okuyama
Recently Dorigoni, Green and Wen conjectured a remarkable exact formula for an integrated correlator of four superconformal primary operators in supersymmetric Yang…
't Hooft expansion of and SYM revisited
Kazumi Okuyama
We study the 't Hooft expansion of supersymmetric Yang-Mills (SYM) theory with the gauge group or . We consider the expansion with fixe…
Page curve from dynamical branes in JT gravity
Kazumi Okuyama, Kazuhiro Sakai
We study the Page curve of an evaporating black hole using a toy model given by Jackiw-Teitelboim gravity with Fateev-Zamolodchikov-Zamolodchikov-Teschner (FZZT) antibranes. We tre…
FZZT branes in JT gravity and topological gravity
Kazumi Okuyama, Kazuhiro Sakai
We study Fateev-Zamolodchikov-Zamolodchikov-Teschner (FZZT) branes in Witten-Kontsevich topological gravity, which includes Jackiw-Teitelboim (JT) gravity as a special case. Adding…
A proof of loop equations in 2d topological gravity
Kazumi Okuyama, Kazuhiro Sakai
We study multi-boundary correlators in 2d Witten-Kontsevich topological gravity. We present a proof of the loop equations obeyed by the correlators. While the loop equations were d…
Capacity of entanglement in random pure state
Kazumi Okuyama
We compute the capacity of entanglement in the bipartite random pure state model using the replica method. We find the exact expression of the capacity of entanglement which is val…
A Peculiar ICME Event in August 2018 Observed with the Global Muon Detector Network
W. Kihara, K. Munakata, C. Kato +20
We demonstrate that global observations of high-energy cosmic rays contribute to understanding unique characteristics of a large-scale magnetic flux rope causing a magnetic storm i…
't Hooft expansion of multi-boundary correlators in 2D topological gravity
Kazumi Okuyama, Kazuhiro Sakai
We study multi-boundary correlators of Witten-Kontsevich topological gravity in two dimensions. We present a method of computing an open string like expansion, which we call the 't…
Genus expansion of open free energy in 2d topological gravity
Kazumi Okuyama, Kazuhiro Sakai
We study open topological gravity in two dimensions, or, the intersection theory on the moduli space of open Riemann surfaces initiated by Pandharipande, Solomon and Tessler. The o…
Quenched free energy in random matrix model
Kazumi Okuyama
We compute the quenched free energy in the Gaussian random matrix model by directly evaluating the matrix integral without using the replica trick. We find that the quenched free e…
JT gravity, KdV equations and macroscopic loop operators
Kazumi Okuyama, Kazuhiro Sakai
We study the thermal partition function of Jackiw-Teitelboim (JT) gravity in asymptotically Euclidean background using the matrix model description recently found by Saad,…
Analysis of cosmic rays' atmospheric effects and their relationships to cutoff rigidity and zenith angle using Global Muon Detector Network data
R. R. S. Mendonça, C. Wang, C. R. Braga +19
Cosmic rays are charged particles whose flux observed at Earth shows temporal variations related to space weather phenomena and may be an important tool to study them. The cosmic r…
Smoothness filtration of the magnitude complex
Kiyonori Gomi
We introduce an intrinsic filtration to the magnitude chain complex of a metric space, and study basic properties of the associated spectral sequence of the magnitude homology. As…
Log-Harnack inequality for reflected SPDEs driven by multiplicative noises and its applications
Bin Xie
We mainly investigate the log-Harnack inequality for the reflected stochastic partial differential equation driven by multiplicative noises based on the gradient estimate of the as…