理学博士, University of Tokyo

Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics, Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics

2021
Professor, Shinshu University

2018 - 2020
東京大学　客員准教授

2012 - 2021
Associate Professor, Shinshu University

2007 - 2012
Assistant Professor, Shinshu University

2006 - 2007
Assistant, Shinshu University

2010 - 2010, Niels Bohr Institute

2004 - 2006, University of British Columbia

2001 - 2004, University of Chicago

1994 - 1999, University of Tokyo, 理学系研究科, 物理学専攻

1990 - 1994, University of Tokyo, 理学部, 物理学科

2008
素粒子論グループ, 素粒子メダル奨励賞

Baby universe operators in the ETH matrix model of double-scaled SYK
Kazumi Okuyama
Journal of High Energy Physics, 2024(10), 249, 31 Oct. 2024, Refereed, Not invited
Lead, Last, Corresponding

More on doubled Hilbert space in double-scaled SYK
Kazumi Okuyama
Physics Letters B, 855, 138858, 09 Jul. 2024, Refereed, Not invited
Lead

Solvable limit of ETH matrix model for double-scaled SYK
Kazumi Okuyama, Takao Suyama
Journal of High Energy Physics, 2024(04), 094, 17 Apr. 2024, Refereed, Not invited
Lead, Last, Corresponding

Doubled Hilbert space in double-scaled SYK
Kazumi Okuyama
Journal of High Energy Physics, 2024(04), 091, 17 Apr. 2024, Refereed, Not invited
Lead

Negativity and its capacity in JT gravity
Kazumi Okuyama, Takeshi Tachibana
Journal of High Energy Physics, 2024(02), 183, 23 Feb. 2024, Refereed, Not invited

Matter correlators through a wormhole in double-scaled SYK
Kazumi Okuyama
Journal of High Energy Physics, 2024(02), 147, 21 Feb. 2024, Refereed, Not invited
Lead, Last, Corresponding

Discrete analogue of the Weil-Petersson volume in double scaled SYK
Kazumi Okuyama
Journal of High Energy Physics, 2023(09), 133, 20 Sep. 2023, Refereed, Not invited
Lead

End of the world brane in double scaled SYK
Kazumi Okuyama
Journal of High Energy Physics, 2023(08), 053, 11 Aug. 2023, Refereed, Not invited
Lead, Last, Corresponding

Late time behavior of n-point spectral form factors in Airy and JT gravities
Takanori Anegawa, Norihiro Iizuka, Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2023(07), 047, 06 Jul. 2023, Refereed, Not invited

High temperature expansion of double scaled SYK
Kazumi Okuyama
Physics Letters B, 843, 138036, 20 Jun. 2023, Refereed, Not invited
Lead, Last, Corresponding

Correlators of double scaled SYK at one-loop
Kazumi Okuyama, Kenta Suzuki
Journal of High Energy Physics, 2023(05), 117, 15 May 2023, Refereed, Not invited

Spectral form factor in the τ-scaling limit
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2023(04), 123, 26 Apr. 2023, Refereed, Not invited

Hartle-Hawking wavefunction in double scaled SYK
Kazumi Okuyama
Journal of High Energy Physics, 2023(03), 152, 21 Mar. 2023, Refereed, Not invited
Lead, Last, Corresponding

Large N expansion of an integrated correlator in N=4 SYM
Yasuyuki Hatsuda, Kazumi Okuyama
Journal of High Energy Physics, 2022(11), 086, 15 Nov. 2022, Refereed, Not invited

't Hooft expansion of SO(N) and Sp(N) N=4 SYM revisited
Kazumi Okuyama
Journal of High Energy Physics, 2022(09), 064, 08 Sep. 2022, Refereed, Not invited
Lead, Last, Corresponding

Page curve from dynamical branes in JT gravity
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2022(02), 087, 11 Feb. 2022, Refereed, Not invited

A proof of loop equations in 2d topological gravity
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2021(10), 107, 14 Oct. 2021, Refereed, Not invited

FZZT branes in JT gravity and topological gravity
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2021(09), 191, 28 Sep. 2021, Refereed, Not invited

Capacity of entanglement in random pure state
Kazumi Okuyama
Physics Letters B, 820, 136600, 24 Aug. 2021, Refereed, Not invited
Lead

't Hooft expansion of multi-boundary correlators in 2D topological gravity
Kazumi Okuyama, Kazuhiro Sakai
Progress of Theoretical and Experimental Physics, 2021(8), 083B03, 14 Jul. 2021, Refereed, Not invited

Genus expansion of open free energy in 2d topological gravity
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2021(03), 217, 23 Mar. 2021, Refereed

Quenched free energy from spacetime D-branes
Kazumi Okuyama
Journal of High Energy Physics, 2021(03), 073, 05 Mar. 2021, Refereed

Quenched free energy in random matrix model
Kazumi Okuyama
Journal of High Energy Physics, 2020(12), 080, 11 Dec. 2020, Refereed

JT supergravity and Brezin-Gross-Witten tau-function
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2020(10), 160, 26 Oct. 2020, Refereed

Multi-boundary correlators in JT gravity
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2020(08), 126, 25 Aug. 2020, Refereed

Replica symmetry breaking in random matrix model: a toy model of wormhole networks
Kazumi Okuyama
Physics Letters B, 803, 135280, 07 Feb. 2020, Refereed

JT gravity, KdV equations and macroscopic loop operators
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2020(01), 156, 24 Jan. 2020, Refereed

Holomorphic anomaly of 2d Yang-Mills theory on a torus revisited
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2019(08), 025, 06 Aug. 2019, Refereed

Eigenvalue instantons in the spectral form factor of random matrix model
Kazumi Okuyama
Journal of High Energy Physics, 2019(03), 147, 25 Mar. 2019, Refereed

Spectral form factor and semi-circle law in the time direction
Kazumi Okuyama
Journal of High Energy Physics, 2019(02), 161, 25 Feb. 2019, Refereed

Connected correlator of 1/2 BPS Wilson loops in N=4 SYM
Kazumi Okuyama
Journal of High Energy Physics, 2018(10), 037, 05 Oct. 2018, Refereed

Resurgence analysis of 2d Yang-Mills theory on a torus
Kazumi Okuyama, Kazuhiro Sakai
Journal of High Energy Physics, 2018(08), 065, 13 Aug. 2018, Refereed

Phase diagram of q-deformed Yang-Mills theory on S^2 at non-zero theta-angle
Kazumi Okuyama
Journal of High Energy Physics, 2018(04), 059, 11 Apr. 2018, Refereed

Phase transition of anti-symmetric Wilson loops in N=4 SYM
Kazumi Okuyama
Journal of High Energy Physics, 2017(12), 125, 21 Dec. 2017, Refereed

Wilson loops in unitary matrix models at finite N
Kazumi Okuyama
Journal of High Energy Physics, 2017(07), 030, 07 Jul. 2017, Refereed

Wilson loops in 3d N= 4 SQCD from Fermi gas
Kazumi Okuyama
Journal of High Energy Physics, 2016(11), 156, 25 Nov. 2016, Refereed

α′-expansion of antisymmetric Wilson loops in N=4 SYM from Fermi gas
Masaatsu Horikoshi, Kazumi Okuyama
Progress of Theoretical and Experimental Physics, 2016(11), 113B05, 16 Nov. 2016, Refereed

Exact results for ABJ Wilson loops and open-closed duality
Yasuyuki Hatsuda, Kazumi Okuyama
Journal of High Energy Physics, 2016(10), 132, 24 Oct. 2016, Refereed

Instanton corrections of 1/6 BPS Wilson loops in ABJM theory
Kazumi Okuyama
Journal of High Energy Physics, 2016(09), 125, 20 Sep. 2016, Refereed

ABJ theory in the higher spin limit
Shinji Hirano, Masazumi Honda, Kazumi Okuyama, Masaki Shigemori
Journal of High Energy Physics, 08, 174, 31 Aug. 2016, Refereed

Numerical analysis of Coleman–de Luccia tunneling
Yuhei Goto, Kazumi Okuyama
International Journal of Modern Physics A, 31(24), 1650131, 30 Aug. 2016, Refereed

TBA-like integral equations from quantized mirror curves
Kazumi Okuyama, Szabolcs Zakany
Journal of High Energy Physics, 2016(03), 101, 15 Mar. 2016, Refereed

Orientifolding of the ABJ Fermi gas
Kazumi Okuyama
Journal of High Energy Physics, 2016(03), 008, 02 Mar. 2016, Refereed

Probing non-perturbative effects in M-theory on orientifolds
Kazumi Okuyama
Journal of High Energy Physics, 2016(01), 054, 11 Jan. 2016, Refereed

Exact instanton expansion of the ABJM partition function
Yasuyuki Hatsuda, Sanefumi Moriyama, Kazumi Okuyama
Progress of Theoretical and Experimental Physics, 2015(11), 104, 28 Oct. 2015, Refereed

Large N non-perturbative effects in N=4 superconformal Chern-Simons theories
Yasuyuki Hatsuda, Masazumi Honda, Kazumi Okuyama
Journal of High Energy Physics, 1509, 046, 09 Sep. 2015, Refereed

Resummations and Non-Perturbative Corrections
Yasuyuki Hatsuda, Kazumi Okuyama
Journal of High Energy Physics, 1509, 051, 09 Sep. 2015, Refereed

Probing non-perturbative effects in M-theory
Yasuyuki Hatsuda, Kazumi Okuyama
Journal of High Energy Physics, 1410, 158, 27 Oct. 2014, Refereed

Non-perturbative effects and the refined topological string
Yasuyuki Hatsuda, Marcos Marino, Sanefumi Moriyama, Kazumi Okuyama
Journal of High Energy Physics, 2014(9), 168, 29 Sep. 2014, Refereed

Exact results on ABJ theory and the refined topological string
Masazumi Honda, Kazumi Okuyama
Journal of High Energy Physics, 2014(8), 148, 26 Aug. 2014, Refereed

ABJM Wilson Loops in Arbitrary Representations
Yasuyuki Hatsuda, Masazumi Honda, Sanefumi Moriyama, Kazumi Okuyama
Journal of High Energy Physics, 2013(10), 168, 24 Oct. 2013, Refereed

Instanton bound states in ABJM theory
Yasuyuki Hatsuda, Sanefumi Moriyama, Kazumi Okuyama
Journal of High Energy Physics, 2013(5), 054, 13 May 2013, Refereed

Instanton effects in ABJM theory from Fermi gas approach
Yasuyuki Hatsuda, Sanefumi Moriyama, Kazumi Okuyama
Journal of High Energy Physics, 2013(1), 158, 24 Jan. 2013, Refereed

Exact results on the ABJM Fermi gas
Yasuyuki Hatsuda, Sanefumi Moriyama, Kazumi Okuyama
Journal of High Energy Physics, 2012(10), 020, 02 Oct. 2012, Refereed

A Note on the Partition Function of ABJM Theory on S3
Kazumi Okuyama
Progress of Theoretical Physics, 127(2), 229-242, 2012, Refereed

Gauge-Higgs unification in spontaneously created fuzzy extra dimensions
Kazuyuki Furuuchi, Takeo Inami, Kazumi Okuyama
Journal of High Energy Physics, 2011(11), 006, Nov. 2011, Refereed

D-branes Wrapped on Fuzzy del Pezzo Surfaces
Kazuyuki Furuuchi, Kazumi Okuyama
Journal of High Energy Physics, 1101, 043, 2011, Refereed

Global AdS Picture of 1/2 BPS Wilson Loops
Kazumi Okuyama
Journal of High Energy Physics, 1001, 096, 2010, Refereed

q-Deformed Oscillators and D-branes on Conifold
Kazumi Okuyama
Physics Letters B, 673, 232-236, 2009, Refereed

Instanton Solution in Tachyon Cosmology
Kazumi Okuyama
Physics Letters B, 658, 241-243, 2008, Refereed

N=4 SYM on K3 and the AdS(3)/CFT(2) Correspondence
Kazumi Okuyama
Journal of High Energy Physics, 0802, 036, 2008, Refereed

Linear Sigma Models for the R^8/Z_k Orbifold
Kazumi Okuyama
Physics Letters B, 668, 153-158, 2008, Refereed

D-Brane Amplitudes in Topological String on Conifold
KazumiOkuyama
Physics Letters B, 645, 275-280, 2007, Refereed

1/2 BPS Correlator and Free Fermion
Kazumi Okuyama
Journal of High Energy Physics, 0601, 021, 2006, Refereed

Hairpin Branes and D-Branes Behind the Horizon
Kazumi Okuyama, Moshe Rozali
Journal of High Energy Physics, 0603, 071, 2006, Refereed

Wilson Loops in N=4 SYM and Fermion Droplets
Kazumi Okuyama, Gordon W. Semenoff
Journal of High Energy Physics, 0606, 057, 2006, Refereed

t Hooft Expansion of 1/2 BPS Wilson Loop
Kazumi Okuyama
JournalofHigh Energy Physics, 0609, 007, 2006, Refereed

Annulus Amplitudes in the Minimal Superstring
Kazumi Okuyama
Journal of High Energy Physics, 0504, 002, 2005, Refereed

Linear Sigma Models of H and KK Monopoles
Kazumi Okuyama
Journal of High Energy Physics, 0508, 089, 2005, Refereed

D1-D5 on ALE Space
Kazumi Okuyama
Journal of High Energy Physics, 0512, 042, 2005, Refereed

Three-Point Functions in N=4 SYM Theory at One-Loop
Kazumi Okuyama, Li-Sheng Tseng
Journal of High Energy Physics, 0408, 055, 2004, Refereed

Annulus Amplitudes and ZZ Branes in Minimal String Theory
David Kutasov, Kazumi Okuyama, Jongwon Park, Nathan Seiberg, David Shih
Journal of High Energy Physics, 0408, 026, 2004, Refereed

Scattered Results in 2D String Theory
Emil Martinec, Kazumi Okuyama
Journal of High Energy Physics, 0410, 065, 2004, Refereed

D-Branes on the Null-Brane
Kazumi Okuyama
Journal of High Energy Physics, 0302, 043, 2003, Refereed

Wess-Zumino Term in Tachyon Effective Action
Kazumi Okuyama
Journal of High Energy Physics, 0305, 005, 2003, Refereed

Comments on Half S-Branes
Kazumi Okuyama
Journal of High Energy Physics, 0309, 053, 2003, Refereed

Siegel Gauge in Vacuum String Field Theory
Kazumi Okuyama
Journal of High Energy Physics, 0201, 043, 2002, Refereed

Ghost Kinetic Operator of Vacuum String Field Theory
Kazumi Okuyama
Journal of High Energy Physics, 0201, 027, 2002, Refereed

Ratio of Tensions from Vacuum String Field Theory
Kazumi Okuyama
Journal of High Energy Physics, 0203, 050, 2002, Refereed

PP-Waves and Holography
Robert G. Leigh, Kazumi Okuyama, Moshe Rozali
Physical Review D, 66, 46004, 2002, Refereed

N=4 SYMon R times S^3 and PP-Wave
Kazumi Okuyama
Journal of High Energy Physics, 0211, 043, 2002, Refereed

Free Field Appoach to StringTheoryon AdS_3
Kazuo Hosomichi,Kazumi Okuyama, Yuji Satoh
Nuclear Physics B, 598, 451-466, 2001, Refereed

Boundary States in B-Field Background
Kazumi Okuyama
PhysicsLetters B, 499, 305-314, 2001, Refereed

Noncommutative Tachyon from Background Independent Open String Field Theory
Kazumi Okuyama
Physics Letters B, 499, 167-173, 2001, Refereed

Comments on Open Wilson Lines and Generalized Star Products
Kazumi Okuyama
Physics Letters B, 506, 377-384, 2001, Refereed

Open string fields as matrices
Kazumi Okuyama
AIP Conf. Proc., 607, 202-208, 2001, Invited

Open string fields as matrices
Teruhiko Kawano, Kazumi Okuyama
Journal of High Energy Physics, 0106, 061, 2001, Refereed

Comma Vertex and String Field Algebra
Kazuyuki Furuuchi, Kazumi Okuyama
Journal of High EnergyPhysics, 0109, 035, 2001, Refereed

Spinor Exchange in AdS_{d+1}
Teruhiko Kawano, Kazumi Okuyama
Nuclear Physics B, 565, 427-444, 2000, Refereed

A Path Integral Representation of the Map between Commutative and Noncommutative Gauge Fields
Kazumi Okuyama
Journal of High Energy Physics, 0003, 016, 2000, Refereed

Path Integral Approach to String Theory on AdS_3
Nobuyuki Ishibashi, Kazumi Okuyama, Yuji Satoh
Nuclear Physics B, 588, 149-177, 2000, Refereed

BRST gauge fixing and the algebra of global supersymmetry
Kazuo Fujikawa, Kazumi Okuyama
Nuclear Physics B, 521, 401-415, 1998, Refereed

SO(9,1) invariant matrix formulation of supermembrane
Kazuo Fujikawa, Kazumi Okuyama
NuclearPhysics B, 510, 175-198, 1998, Refereed

BPS Condition of String Junction from M theory
Yutaka Matsuo, Kazumi Okuyama
Physics Letters B, 426, 294-296, 1998, Refereed

Matrix Theory on Noncommutative Torus
Teruhiko Kawano, Kazumi Okuyama
Physics Letters B, 433, 29-34, 1998, Refereed

String Network and 1/4 BPS States in N=4 SU(n) Supersymmetric Yang-Mills Theory
Teruhiko Kawano, Kazumi Okuyama
Physics Letters B, 432, 338-342, 1998, Refereed

Fractional Strings in (p,q) 5-brane and Quiver Matrix String Theory
Kazumi Okuyama, Yuji Sugawara
Journal of High Energy Physics, 9808, 002, 1998, Refereed

On a Lorentz covariant matrix regularization of membrane theories
Kazuo Fujikawa, Kazumi Okuyama
Physics Letters B, 411, 261-267, 1997, Refereed

日本物理学会

JT重力の行列模型から探る量子重力の非摂動効果
科学研究費補助金, 基盤研究(C)
01 Apr. 2022 - 31 Mar. 2025

量子情報を用いた量子宇宙の基礎理論
科学研究費補助金, 京都大学, 学術変革領域研究(A)
10 Sep. 2021 - 31 Mar. 2026

ゲージ理論の厳密な結果から探る量子的な時空の構造
科学研究費補助金, 基盤研究(C)
01 Apr. 2019 - 31 Mar. 2022

M理論の非摂動効果とフェルミ気体
科学研究費補助金, 基盤研究(C)
01 Apr. 2016 - 31 Mar. 2019

超弦理論における量子的な時空の幾何学
科学研究費補助金, 若手研究（Ｂ)
28 Apr. 2011 - 31 Mar. 2015

超弦理論における時空の出現
科学研究費補助金, 若手研究（Ｂ）
01 Apr. 2007 - 31 Mar. 2010