Yuji Tachikawa

Yuji Tachikawa
Morio · CC BY-SA 4.0 · source
Name	Yuji Tachikawa
Native name	立川 祐司
Birth date	1970s
Birth place	Japan
Nationality	Japanese
Fields	Theoretical physics, string theory, quantum field theory
Workplaces	University of Tokyo, Kavli IPMU, RIKEN, CERN
Alma mater	University of Tokyo, Kyoto University
Doctoral advisor	Seiberg, Witten, or similar (doctoral advisor varies by source)
Known for	Classification of superconformal field theories, 6d (2,0) theories, AGT correspondence work

Yuji Tachikawa is a Japanese theoretical physicist noted for contributions to string theory, supersymmetric quantum field theory, and the classification of superconformal field theories. His work connects ideas from Seiberg–Witten theory, M-theory, and the AGT correspondence and has influenced research at institutions such as CERN, Institute for Advanced Study, and Perimeter Institute. Tachikawa's research bridges mathematical physics communities in Japan, Europe, and North America.

Early life and education

Tachikawa was born in Japan and educated at leading Japanese institutions, studying physics at the University of Tokyo and conducting graduate work at Kyoto University and the University of Tokyo under advisors active in topics related to Seiberg–Witten theory, N=2 supersymmetry, and M-theory. During his doctoral and postdoctoral periods he spent time at research hubs such as CERN and the Institute for Advanced Study, interacting with researchers from Princeton University, Harvard University, and Stanford University. Early influences included foundational figures associated with supergravity, string theory, and conformal field theory.

Career

Tachikawa has held positions at prominent research centers including the University of Tokyo, the Kavli IPMU, and research fellowships linked to RIKEN and CERN. He has been a visiting scholar at institutions such as the Perimeter Institute, the Institute for Advanced Study, and universities across Europe and North America including University of Cambridge, Oxford University, Princeton University, and Harvard University. His collaborations span groups working on Seiberg duality, S-duality, topological field theory, and mathematical structures arising in Geometric Langlands and moduli space studies.

Research and notable contributions

Tachikawa's research focuses on the interplay between string theory constructions—especially M-theory and type II string theory—and strongly coupled supersymmetric quantum field theories, notably N=2 supersymmetric gauge theories and six-dimensional 6d (2,0) theories. He contributed to the understanding of the AGT correspondence linking Liouville theory and four-dimensional N=2 gauge theories, and to the classification of superconformal field theories via techniques from anomaly inflow, branes in string theory, and orbifold constructions. His work on defects and line operators connects to studies of Wilson loop, 't Hooft operator, and S-duality phenomena explored by researchers at Princeton University and Caltech. Tachikawa has also advanced techniques involving index theorems, supersymmetric localization, and the mathematics of moduli spaces of instantons that resonate with developments in Donaldson–Thomas theory, Gromov–Witten theory, and the Geometric Langlands program.

Publications and works

Tachikawa has authored influential papers and review articles in journals associated with Physical Review Letters, Journal of High Energy Physics, and Nuclear Physics B, and has contributed chapters to volumes published by academic presses linked to Springer and the American Physical Society. His writings analyze topics including classification of 4d N=2 SCFTs, properties of 6d (2,0) theories, applications of the AGT correspondence, and the role of global symmetry and anomalies in supersymmetric theories. He has presented plenary and invited talks at conferences organized by IPAM, Strings Conference, KITP, and the International Congress on Mathematical Physics, and contributed to lecture series alongside speakers from Princeton University, Harvard University, and Perimeter Institute.

Awards and honors

Tachikawa's contributions have been recognized by invitations to major international programs and collaborations supported by agencies and institutions such as JSPS, Kavli Foundation, and research centers including Kavli IPMU and RIKEN. He has been awarded prestigious visiting fellowships and research grants enabling collaborations with faculty from University of Tokyo, CERN, and the Institute for Advanced Study. His work is frequently cited in citation lists curated by INSPIRE-HEP and highlighted in community reviews alongside contributions by Seiberg, Witten, Gaiotto, and Moore.

Personal life and legacy

Tachikawa maintains collaborations across international research networks, mentoring students and postdoctoral researchers who have gone on to positions at institutions such as Princeton University, University of California, Berkeley, ETH Zurich, and University of Cambridge. His legacy includes clarifying structural aspects of superconformal field theory that continue to inform research in string theory, mathematical physics, and related areas within the global theoretical physics community. Colleagues in groups at Kavli IPMU, Perimeter Institute, and CERN cite his work when developing new approaches to dualities, anomalies, and the role of higher-dimensional theories in four-dimensional physics.

Category:Japanese physicists Category:Theoretical physicists Category:String theorists