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SUMMARY:Bosonic SPT and invertible phases and its relation to Steenrod's p
 roblem
DTSTART;VALUE=DATE-TIME:20260707T060000Z
DTEND;VALUE=DATE-TIME:20260707T080000Z
DTSTAMP;VALUE=DATE-TIME:20260704T022800Z
UID:indico-event-5155@indico-tdli.sjtu.edu.cn
DESCRIPTION:Speakers: Yi Zhang (张翼) (Kavli IPMU\, University of Tokyo)
 \n\nAbstract:Invertible and symmetry-protected topological phases can be o
 rganized using bordism groups and their duals. In this talk I will discuss
  bosonic phases described by oriented bordism\, focusing on the first beyo
 nd-cohomology phenomena in the Atiyah-Hirzebruch spectral sequence. Unlike
  the fermionic Gu-Wen supercohomology story\, where the first correction i
 s mod 2\, the corresponding bosonic effect is mod 3 and is tied to the fir
 st Pontryagin class.I will explain several low-dimensional examples\, incl
 uding finite symmetry groups and higher-form symmetry backgrounds\, and sh
 ow how spectral-sequence extension problems determine the group of phases.
  I will also describe a 6+1 dimensional Dijkgraaf-Witten phase which is no
 ntrivial on general spaces but vanishes on manifolds\, giving a physical c
 ounterpart of the classical Steenrod problem.Biography: He received his B
 achelor of Science degree from Heidelberg University\, Germany\, in 2015\,
  followed by a Master’s degree in Physics and the Diplôme de l’École
  Normale Supérieure from École Normale Supérieure\, Paris\, in 2017. In
  2021\, he earned his Ph.D. in Physics from the Institute of Theoretical P
 hysics (IPhT/CEA Saclay)\, Paris-Saclay University. In 2020 and 2021\, he 
 was invited as a long-term visitor to the Max Planck Institute for Gravita
 tional Physics\, also known as the Albert Einstein Institute\, in Potsdam\
 , Germany\, and to the Korea Institute for Advanced Study (KIAS) in Seoul\
 , South Korea. From 2022 to 2024\, he conducted postdoctoral research at P
 eking University. Since 2024\, he has been a postdoctoral researcher at Ka
 vli IPMU\, University of Tokyo. His research focuses on the algebraic\, ge
 ometric\, and topological structures underlying string theory\, quantum fi
 eld theory\, and supergravity\, with particular emphasis on symmetries and
  anomalies.Alternative online link: https://meeting.tencent.com/dm/HFMdcR
 9w7UxuID: 767893024 (No Password) \n\nhttps://indico-tdli.sjtu.edu.cn/e
 vent/5155/
LOCATION:Tsung-Dao Lee Institute/N6F-N600 - Lecture Room (Tsung-Dao Lee In
 stitute)
URL:https://indico-tdli.sjtu.edu.cn/event/5155/
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