Yatsugatake Workshop, 2025
Wild Ramification and Etale Homotopy
Organizing Committee:
Ko Aoki (MPIM), Federico Binda (Milano), Wataru Kai (Tohoku), Alberto Merici (Heidelberg), Hiroyasu Miyazaki (NTT), Shuji Saito (Tokyo)Speakers
Piotr Achinger (Warszawa)
Ko Aoki (MPIM)
Magnus Carlson (Frankfurt)
Xiaomin Chu (Milan)
Katharina Hu"bner (Frankfurt)
Ryo Ishizuka (Institute of Science Tokyo)
Junnosuke Koizumi (RIKEN iTHEMS)
Yutaro Mikami (Tokyo)
Massimo Pippi (CNRS, Universite' Angers)
Fei Ren (Wuppertal)
Vladimir Sosnilo (RIKEN iTHEMS)
Yuta Takaya (Tokyo)
Daichi Takeuchi (Institute of Science Tokyo)
Yuri Yatagawa (Institute of Science Tokyo)
Yigeng Zhao (Westlake)
This workshop is supported by
JSPS Grant-in-Aid (S) 24H00015 representative Nobuo Tsuzuki
Grant-in-Aid (Early-Career Scientists) #22K13886 representative Wataru Kai
JSPS Grant-in-Aid (C) #24K06699 representative Hiroyasu Miyazaki
JSPS Grant-in-aid (B) #25K00904 representative Shuji Saito.
Program
17(Wed)/Sep:
9:30-10:45 Achinger, "Overview"
11:15-12:30 , "Background on ramification theory"
14:30-15:45 , "Nearby cycles"
16:15-17:30 , "Variation of the Swan conductor"
18(Thu)/Sep:
9:30-10:45 Chu, "The singular support and the Radon transform (I)"
11:15-12:30 , "The singular support and the Radon transform (II)"
14:30-15:45 Takaya, "Characteristic cycle (I): the Milnor formula and integrality"
16:15-17:30 Zhao, "Characteristic cycle (II): the index formula and compatibility with pull-back"
19(Fri)/Sep:
9:30-10:45 -, "Recap talk"
11:15-12:30 Mikami, "The K(π,1) theorem (I): the Bertini theorem"
14:30-15:45 , "Gabber’s affine analog of proper base change"
16:15-17:30 Sosnilo, "The K(π,1) theorem (II): the end of the proof, corollaries"
20(Sat)/Sep:
9:30-10:45 Ishizuka, "The Frobenius-Witt cotangent bundle"
11:15-12:30 Yatagawa, "Singular support in mixed characteristic (I)"
14:30-15:45 Carlson, "Singular support in mixed characteristic (II)"
16:15-17:30 Takeuchi, "Quantitative sheaf theory"
21(Sun)/Sep:
10:00-12:00 "Concluding remarks":