Schreiber Equivariant Cohomotopy of toroidal orbifolds

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• Urs Schreiber (NYU Abu Dhabi & Czech Academy of Science, Prague):

  
  

  Equivariant Cohomotopy and Physics

  
  

  talk at Prof. Sadok Kallel‘s group seminar,

  AUS Maths Dept. Sharjah, 21st October of 2019

Abstract. We first review two classical results of (equivariant) differential topology:

1. the unstable Pontrjagin-Thom theorem in Cohomotopy theory
2. the equivariant Hopf degree theorem in equivariant Cohomotopy theory.

Then we explain how these old results shed light on open problems in the mathematical foundations of brane physics.

This is joint work with Hisham Sati, based on this preprint:

• Hisham Sati, U.S.:

Equivariant Cohomotopy implies orientifold tadpole cancellation

arXiv:1909.12277

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