NORTHEASTERN UNIVERSITY
MATHEMATICS DEPARTMENT
 
Geometry-Algebra-Singularities-Combinatorics 
Seminar
 
 
Noncommutative differential geometry and Yang-Mills theory on permutation group S_3 
 
 

Shahn Majid

(University of London )
 
 

Northeastern University

509 Lake Hall

1:30 p.m., Monday, Feb. 12, 2001

 
 
Abstract:   Using quantum-group methods and noncommutative geometry we show that even finite sets and finite-dimensional algebras can be endowed with rich `differentiable manifold' structures and associated geometry. In the case of finite groups the translation-invariant differentiable structures are classified by conjugacy classes and there is an induced `braided Lie algebra' and Killing form metric. Permutation groups are looked at in detail, with S_3 as a concrete example. We obtain it's de Rahm cohomology, moduli space of flat connections and Ricci curvature (it turns out to be an `Einstein space'). The relations of the group appear as cycles and we show that the Yang-Mills action has a natural interpretation in terms of their holonomies. We also indicate some connections with representation theory.
 
Home Web page:  Alexandru I. Suciu  Created: Jan 26, 2001   
Maintained by:  Carol Chang  URL: http://www.math.neu.edu/~GASC/gas/Majid.html