Talks

International Conferences

Blanchfield pairings and Gordian distance, Geometry and Topology Seminar, the University of Glasgow, United Kingdom, March 2025.
Blanchfield pairings and Gordian distance, Knot theory, LMO invariants and related topics, Okinawa Institute of Science and Technology Graduate University, Japan, March 2024.
Thurston norm, twisted Euler characteristics and virtual fibering, The 19th Kagoshima Algebra-Analysis-Geometry Seminar, Kagoshima University, Japan, February 2024.
Torsion polynomial functions and essential surfaces, Séminaire GT3, Université de Strasbourg, France, October 2022.
Twisted Alexander polynomials and L²-Euler characteristics, Global Analysis Seminar, University of Regensburg, Germany, December 2019.
Character varieties and essential surfaces, Low-Dimensional Topology Workshop 2019, University of Regensburg, Germany, October 2019.
Character varieties and essential surfaces, The 14th East Asian Conference on Geometric Topology, Peking University, China, January 2019.
Twisted Alexander polynomials and L²-Euler characteristics, New development of low-dimensional topology, Shikinoyu Gora Seiunsou, Japan, December 2018.
Torsion polynomial functions and essential surfaces, Low Dimensional Topology and Number Theory X, AiRIMaQ Innovation Plaza, Japan, March 2018.
Representation varieties and essential surfaces, New Development in Teichmüller Space Theory, Okinawa Institute of Science and Technology Graduate University, Japan, November 2017.
Representation varieties detect splittings of 3-manifolds, Invariants in Low-dimensional Topology, Korea Institute for Advanced Study, South Korea, May 2017.
Representation varieties detect splittings of 3-manifolds, The second Australia-Japan Geometry, Analysis and their Applications, Kyoto University, Japan, January 2017.
Representation varieties detect splittings of 3-manifolds, Rigidity School, Nagoya 2016, Nagoya University, Japan, July 2016.
Representation varieties detect essential surfaces, Branched Coverings, Degenerations, and Related Topics 2016, Hiroshima University, Japan, March 2016.
Representation varieties detect essential surfaces, Geometry of Moduli Space of Low Dimensional Manifolds, Kyoto University, Japan, December 2015.
Representation varieties detect essential surfaces I, II, Topology and Geometry of Low-dimensional Manifolds, Nara Women's University, Japan, October 2015.
Representation varieties detect essential surfaces, Braids, Configuration Spaces and Quantum Topology, the University of Tokyo, Japan, September 2015.
Cluster algebras and torsion functions on moduli spaces, Infinite Analysis 14, the University of Tokyo, Japan, March 2014.
Character varieties of higher dimensional representations and splittings of 3-manifolds, Global Analysis Seminar, University of Regensburg, Germany, November 2013.
Twisted Alexander polynomials and incompressible surfaces given by Culler-Shalen theory, Quantum Topology and Hyperbolic Geometry Conference, Yasaka Saigon Nhatrang Resort Hotel, Vietnam, May 2013.
On an analogue of Culler-Shalen theory for higher dimensional representations, Low Dimensional Topology and Number Theory V, Fukuoka Soft Resarch Park, Japan, March 2013.
On an analogue of Culler-Shalen theory for higher dimensional representations, Aspects of representation theory in low-dimensional topology and 3-dimensional invariants, hôtel club Vacanciel, France, November 2012.
Non-commutative Reidemeister torsion, higher-order Alexander polynomials and circle valued Morse theory, Circle valued Morse theory and Alexander invariants, the University of Tokyo, Japan, November 2011.
On the leading coefficient of the metabelian Alexander polynomial, Knots and Links: From Form to Function, Scuola Normale Superiore di Pisa, Italy, July 2011.
Non-commutative Reidemeister torsion for homology cylinders, Topology Seminar, University of Nantes, France, June 2011.
Non-commutative Reidemeister torsion for homology cylinders, Geometric and Analytic Approaches to Representations of a Group and Representation Spaces, Kyoto University, Japan, June 2011.
Non-commutative Reidemeister torsion for homology cylinders, Low Dimensional Topology and Number Theory III, Kyushu University, Japan, March 2011.
Non-commutative Reidemeister torsion and Morse-Novikov theory, Low Dimensional Topology, University of Cologne, Germany, November 2010.
On the leading coefficients of higher-order Alexander polynomials, Twisted Topological Invariants and Topology of Low-Dimensional Manifolds, Akita Shirakami Taiken Center, Japan, September 2010.
Non-commutative Reidemeister torsion and Morse-Novikov theory, Knots, Contact Geometry and Floer homology, Tambara Workshop, the University of Tokyo, Japan, May 2010.
Non-commutative Reidemeister torsion and Morse-Novikov theory, Low Dimensional Topology and Number Theory II, the University of Tokyo, Japan, March 2010.
On metabelian Reidemeister torsion, The Sixth East Asian School of Knots and Related Topics, Nankai University, China, January 2010.
Non-commutative Reidemeister torsion and Morse-Novikov theory, Intelligence of Low Dimensional Topology 2009, Osaka City University, Japan, November 2009.
Torsion volume forms and twisted Alexander functions on character varieties of knots, Low Dimensional Topology and Number Theory, Kyushu University, Japan, March 2009.
Reidemeister torsion for linear representations and Seifert surgery on knots, The Fifth East Asian School of Knots and Related Topics, Gyeongju TEMF Hotel, South Korea, January 2009.
Isometries on SU(2)-representation spaces of knot groups and twisted Alexander functions (a poster presentation), The Forth East Asian School of Knots and Related Topics, the University of Tokyo, Japan, January 2008.
Refinement of twisted Alexander invariants and sign-determined Reidemeister torsion, The Third East Asian School of Knots and Related Topic, Osaka City University, Japan, February 2007.

Japanese Workshops

Ribbon concordance and twisted Alexander polynomials, Topology and Computers 2021 (a literal translation), Online, September 2021.
Ribbon concordance and twisted Alexander polynomials (a literal translation), N-KOOK Seminar, Online, May 2021.
Representations of fundamaetal groups and 3-manifold topology, RIKEN iTHEMS Math Seminar, Online, November 2020.
Spaces of linear representations and subsurfaces in 3-manifolds (a literal translation), Algebraic and Geometric Models of Spaces and Related Topics (a literal translation), Shinshu Unversity, September 2018.
On torsion polynomial functions and splittings of 3-manifolds (a literal translation), Mathematics Seminar, Tokyo Denki Unversity, July 2018.
Deformations of linear representations and splittings of 3-manifolds, Colloquium talk, Tokyo Institute of Technology, July 2017.
Moduli spaces of linear representations and splittings of 3-manifolds, Colloquium, the University of Tokyo, May 2016.
Torsion invariants and representation varieties for non-positively curved cube complexes, Tuesday Seminar on Topology, the University of Tokyo, April 2016.
Representation varieties detect essential surfaces, Tuesday Seminar on Topology, the University of Tokyo, July 2015.
Splittings of 3-manifolds in view of moduli spaces of linear representations and torsion functions, Colloquium talk, Tokyo Institute of Technology, June 2014.
Cluster algebras and torsion functions on moduli spaces, Tokyo Tech Topology Seminar, Tokyo Institute of Technology, January 2014.
On an analogue of Culler-Shalen theory for higher dimensional representations, Topology of Varieties and its Related Topics (a literal translation), Hokkaido University, August 2013.
On an analogue of Culler-Shalen theory for higher dimensional representations, Geometry Seminar, Tohoku University, June 2013.
On an analogue of Culler-Shalen theory for higher dimensional representations, Tuesday Seminar on Topology, the University of Tokyo, June 2013.
Torsion functions on character varieties and an extension of Culler-Shalen theory, MSJ Spring Meeting 2013 (Invited talk), Kyoto University, March 2013.
The virtual fibering theorem and sutured manifold hierarchies, Topology Seminar, Gifu University, February 2013.
The virtual fibering theorem and sutured manifold hierarchies, Tuesday Seminar on Topology, the University of Tokyo, November 2012.
Twisted Alexander polynomialas of handlebody-knots, handlebody-knots and related topics (a literal translation), Osaka Institute of Technology, October 2012.
On an analogue of Culler-Shalen theory for higher dimensional representations, Topology Seminar, University of Tsukuba, October 2012.
On an analogue of Culler-Shalen theory for higher dimensional representations, Topology Seminar, Tokyo Institute of Technology, June 2012.
Applications of non-commutative Reidemeister torsion, GCOE Tea Time, Kyoto University, January 2012.
Homology cylinders of higher-order, Topology Related to Riemann Surfaces (a literal translation), the University of Tokyo, September 2011.
Non-commutative Reidemeister torsion and Morse-Novikov theory, Shin KOOK Seminar, Osaka City University, May 2011.
Reidemeister torsion and homology cylinders, Spring Workshop 2011 on Low-Dimensional Topology and its Ramifications, Meijo University, March 2011.
Homology cylinders of higher-order, Topology Seminar, Tokyo University of Agriculture and Technology, January 2011.
Non-commutative Reidemeister torsion and Morse-Novikov theory, Differential Topology Seminar, Kyoto University, July 2010.
Non-commutative Reidemeister torsion and Morse-Novikov theory, Tuesday Seminar on Topology, the University of Tokyo, June 2010.
Non-commutative Reidemeister torsion and Morse-Novikov theory, Mathematical Society of Japan Spring Meeting 2010, Keio University, March 2010.
Foundations and applications of twisted Alexander polynomials, Kansai Low-dimensional Topology Freshman's Seminar (a literal translation), Nara Women's University, February 2010.
On metabelian Reidemeister torsion, Topology Seminar, Tokyo University of Agriculture and Technology, December 2009.
Non-commutative Reidemeister torsion and Morse-Novikov theory, Topology Seminar, Tokyo University of Agriculture and Technology, July 2009.
Torsion volume forms and twisted Alexander functions on character varieties of knots, Topology Seminar, Tokyo Institute of Technology, July 2009.
Torsion volume forms and twisted Alexander functions on character varieties of knots, Tuesday Seminar on Topology, the University of Tokyo, June 2009.
Reidemeister torsion for linear representations and Dehn surgery on knots, Workshop on Computers and Topology (a literal translation), the University of Tokyo, April 2009.
Reidemeister torsion for linear representations and Seifert surgery on knots, Topology Seminar, Tokyo University of Agriculture and Technology, December 2008.
Reidemeister torsion for linear representations and Seifert surgery on knots, Topology Seminar, Tokyo Institute of Technology, November 2008.
Symmetry of SU(2)-representation spaces of knot groups and normalized twisted Alexander invariants, The Fifth Kinosaki Shinjin Seminar, Kinosaki Health Welfare center, February 2008.
Twisted Alexander invariant and its applications, Winter Workshop 2008 on Low-Dimensional Topology and its Ramifications, Osaka City University, February 2008.
Symmetry of twisted Alexander invariants on SU(2)-representation spaces, Topology Seminar, Tokyo University of Agriculture and Technology, November 2007.
Refinement of twisted Alexander invariants and sign-determined Reidemeister torsions, Topology Seminar, Tokyo University of Agriculture and Technology, January 2007.

For the general public

Introduction to Topology (a literal translation), Friday Special Lectures for High School Students and University Students, the University of Tokyo, May 2022.
Introduction to Topology (a literal translation), UTokyo Open Campus 2017, the University of Tokyo, August 2017.
Topology, Winter vacation lectures for highschool students 2016 (a literal translation), the University of Tokyo, December 2016.

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