Workshop: Johnson homomorphisms and related topics 2019

    Monday May 13 - Friday May 17, 2019

    Lecture Hall on the ground floor of the Mathematical Science Building
    The University of Tokyo

Schedule (Last modified: May 4)
Monday, May 13
10:00-11:00 Takao Satoh (Tokyo University of Science)
On the Andreadakis conjecture of the automorphism groups of free groups
11:20-12:20 Takuya Sakasai (The University of Tokyo)
Johnson homomorphisms up to degree 7
12:20-14:20 Lunch
14:20-15:20 Kazuo Habiro (RIMS, Kyoto University)
Cyclic nerves of stratified categories
15:40-16:40 Yuta Nozaki (Meiji University)
Finiteness of the image of the Reidemeister torsion of a splice

Tuesday, May 14
10:00-11:00 Jacques Darné (Université Grenoble Alpes)
The Andreadakis problem and Milnor invariants of (welded) braids up to homotopy
11:20-12:20 Shunsuke Tsuji (RIMS, Kyoto University)
The 4th Johnson homomorphism and the 2nd term of the Ohtsuki series
12:20-14:00 Lunch
14:00-15:00 Jae Choon Cha (POSTECH)
Transfinite lower central series and Milnor invariants of 3-manifolds
15:20-16:20 Luis Paris (Université de Bourgogne)
Commensurator and commensurability of braid groups
17:00-18:30 Tuesday Seminar on Topology
19:00- Banquet

Wednesday, May 15
10:00-11:00 Hokuto Konno (RIKEN iTHEMS)
Characteristic classes defined using 4-dimensional gauge theory
11:20-12:20 Oscar Randal-Williams (University of Cambridge)
Cohomology of Torelli groups
Afternoon FMSP Lectures

Thursday, May 16
10:00-11:00 Anderson Vera (IRMA, Université de Strasbourg)
Alternative versions of the Johnson homomorphisms and the LMO functor
11:20-12:20 Hidekazu Furusho (Nagoya University)
Kontsevich's eye, Lie graphs and associators
12:20-14:20 Lunch
14:20-15:20 Yuuki Tadokoro (National Institute of Technology, Kisarazu College)
Pointed harmonic volume and its relation to the extended Johnson homomorphism
15:40-16:40 Martin Kassabov (Cornell University)
Co-cycles in the Lie algebra of special derivations

Friday, May 17
10:00-11:00 Minkyoung Song (IBS Center for Geometry and Physics)
Invariants of the homology cobordism group of homology cylinders
11:20-12:20 Yusuke Kuno (Tsuda University)
Generalized Dehn twists on surfaces and homology cylinders
Afternoon Discussion


sakasai (at)