A deRham model for Chen-Ruan cohomology ring of abelian orbifolds
Abstract
Description
We present a deRham model for Chen-Ruan cohomology ring of abelian orbifolds. We introduce the notion of \emph{twist factors} so that formally the stringy cohomology ring can be defined without going through pseudo-holomorphic orbifold curves. Thus our model can be viewed as the classical description of Chen-Ruan cohomology for abelian orbifolds. The model simplifies computation of Chen-Ruan cohomology ring. Using our model, we give a version of wall crossing formula.
14 pages, corrected typos, added more references and shifted to presentation using groupoid
14 pages, corrected typos, added more references and shifted to presentation using groupoid