nLab
discrete torsion

Context

Cohomology

cohomology

Special and general types

Special notions

Variants

Extra structure

Operations

Theorems

Differential cohomology

Contents

Idea

What is known in the literature as discrete torsion are phenomena of equivariant ordinary differential cohomology, specifically of circle 2-bundles with connection modelling the B-field in string theory over orbifold base spaces.

References

The identification of “discrete torsion” in type II string theory as a choice of orbifold equivariance on a principal 2-bundle/bundle gerbe is due to

Generalization to heterotic string theory is discussed in

and the analog for the C-field 2-gerbe in M-theory in

See also

Revised on August 25, 2016 06:10:37 by Urs Schreiber (82.113.106.7)