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"The notes of this paradoxalist do not end here, however.
He could not refrain from going on with them,
but it seems to us that we may stop here."
Notes from Underground, 1864
"In principle, it requires no particular knowledge of mathematics on the reader's part,
but only a certain familiarity with mathematical reasoning
and a certain capacity for abstract thought."
N. Bourbaki
Links
Links
Current publications are below:
Current publications are below:
Papers
Papers
O. Morikawa,
``The Changing Meaning of One-Loop Exactness in $\mathcal{N}=2$ Supersymmetric Yang--Mills Theory,''
O. Morikawa and S. Ogawa,
``A physical connection criterion for reaction-coordinate reduction in quantum-field tunneling,''
arXiv
O. Morikawa,
``Center-twisted Gribov spectra and the finite-volume Gaussian response in the refined Gribov--Zwanziger framework,''
arXiv:2609.03525 [hep-th] [INSPIRE].
O. Morikawa,
``Two Languages for the Same Resonance: From Nuclear Decay to Black-Hole Ringdown,''
arXiv:2608.29806 [gr-qc] [INSPIRE].
O. Morikawa, S. Ogawa and T. Hirose,
``Riesz--Laurent representation of black-hole scattering and sourced response at exceptional points,''
arXiv:2608.14752 [gr-qc] [INSPIRE].
H. Watanabe, I. Kanamori, O. Morikawa, Y. Nagai, Y. Tanizaki and A. Tomiya,
``Numerical Hint for Dyon Condensation at $\theta=2\pi$ via Wilson--'t~Hooft Loops in $SU(2)$ Yang--Mills Theory,''
arXiv:2606.13428 [hep-lat] [INSPIRE].
S. Ogawa, O. Morikawa and T. Hirose,
``Quasinormal modes and continuum response of de Sitter black holes via complex scaling method,''
arXiv:2605.03277 [hep-th] [INSPIRE].
S. Ogawa, T. Hirose and O. Morikawa,
``Complex scaling approach to quasinormal modes of Schwarzschild and Reissner--Nordstr\"om black holes,''
PTEP [arXiv:2604.20442 [hep-th]] [INSPIRE].
O. Morikawa, S. Ogawa and S. Onoda,
``Geometric phase from encircling an exceptional point of a quantum resonance in the complex-scaling method,''
PRA 113, 052225 (2026) [arXiv:2512.24528 [quant-ph]] [INSPIRE].
O. Morikawa and S. Ogawa,
``Exact WKB method for radial Schrödinger equation,''
JPhysA 59, 145202 (2026) [arXiv:2510.11766 [quant-ph]] [INSPIRE].
S. Onoda, O. Fukushima, R. Hamazaki and O. Morikawa,
``Eigenstate Thermalization Hypothesis with projective representation,''
JHEP 06, 138 (2026) [arXiv:2509.01931 [hep-th]] [INSPIRE].
O. Morikawa and S. Ogawa,
``On continuum and resonant spectra from exact WKB analysis,''
JPhysA 59, 225306 (2026) [arXiv:2508.09211 [quant-ph]] [INSPIRE].
O. Morikawa and S. Ogawa,
``Unified exact WKB framework for resonance -- Zel'dovich and complex-scaling regularizations,''
JHEP 10, 49 (2025) [arXiv:2505.02301 [hep-th]] [INSPIRE].
O. Morikawa and S. Ogawa,
``Nonperturbative Formulation of Resonances in Quantum Mechanics Based on Exact WKB Method,''
PTEP 2025, no.10, 103B01 (2025) [arXiv:2503.18741 [hep-th]] [INSPIRE].
O. Morikawa and H. Suzuki,
``Direct Monte Carlo computation of the 't Hooft partition function,''
PTEP 2025, no.6, 063B04 (2025) [arXiv:2501.07042 [hep-lat]] [INSPIRE].
M. Abe, O. Morikawa and H. Suzuki,
``Monte Carlo simulation of the SU(2)/Z_2 Yang-Mills theory,''
PTEP 2025, no.6, 063B03 (2025) [arXiv:2501.00286 [hep-lat]] [INSPIRE].
O. Morikawa and H. Suzuki,
``Winding number on 3D lattice,''
Proceedings
Proceedings
O. Morikawa and H. Suzuki,
``Direct numerical simulation of 't Hooft partition function and (de)confining phase,''
PoS LATTICE2025, 182 (2026) [arXiv:2601.20159 [hep-lat]] [INSPIRE].
Talk presented at the 42nd International Symposium on Lattice Field Theory (Lattice2025), November 2nd - 8th, 2025, Tata Institute of Fundamental Research (TIFR), Mumbai.
O. Morikawa, S. Onoda and H. Suzuki,
``Novel Lattice Formulation of 2D Chiral Gauge Theory via Bosonization,''
PoS LATTICE2024, 363 (2025) [arXiv:2501.18949 [hep-lat]] [INSPIRE].
Talk presented at the 41st International Symposium on Lattice Field Theory (Lattice2024), July 28th - August 3rd, 2024, The University of Liverpool.
M. Abe and O. Morikawa,
``Numerical simulation of fractional topological charge in SU(N) gauge theory coupled with Z_N 2-form gauge fields,''
PoS LATTICE2024, 380 (2025) [arXiv:2501.11438 [hep-lat]] [INSPIRE].
Talk presented at the 41st International Symposium on Lattice Field Theory (Lattice2024), July 28th - August 3rd, 2024, The University of Liverpool.
O. Morikawa, M. Tanaka, M. Kitazawa and H. Suzuki,
``Lattice study of RG fixed point based on gradient flow in 3D O(N) sigma model,''
PoS LATTICE2024, 349 (2025) [arXiv:2410.19425 [hep-lat]] [INSPIRE].
Talk presented at the 41st International Symposium on Lattice Field Theory (Lattice2024), July 28th - August 3rd, 2024, The University of Liverpool.
Monograph / Textbook
Monograph / Textbook
O. Morikawa, S. Ogawa and T. Hirose,
ブラックホール応答理論 (Black-Hole Response Theory)
online textbook / monograph, publicly available from the authors' repositories, 2026.
TeX, PDF in JP @Google Drive (English version translated by ChatGPT)
PDF in JP @GitHub (English translation available)
O. Morikawa and S. Ogawa,
Quantum Resonance as a Global Connection Problem
online textbook / monograph, publicly available from the authors' repositories, 2026.
Selected Public Repositories
Selected Public Repositories
S. Ogawa, O. Morikawa,
``CSMQNM.jl,''
GitHub: skeleton for computing black-hole quasinormal-mode candidates with the complex scaling method (CSM), 2026 (link)
O. Morikawa,
``AutoTortoise.jl,''
GitHub: horizon-aware tortoise-coordinate construction for static spherically symmetric black-hole metrics, 2026 (link)
A. Tomiya, Y. Nagai, et. al.
``akio-tomiya/Gaugefields.jl v0.4.0,''
GitHub: Julia package for utilities of gauge fields, 2024 (link).
O. Morikawa,
``HigherBfields.jl (forked from akio-tomiya/Gaugefields.jl),''
GitHub: Julia package for utilities of gauge fields coupled with higher-form gauge fields, 2024 (link).
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