, Volume 336, Issue 1, pp 51-71
Date: 19 Jun 2006

A deRham model for Chen-Ruan cohomology ring of Abelian orbifolds

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We present a deRham model for Chen-Ruan cohomology ring of abelian orbifolds. We introduce the notion of 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.

B.C is supported by a grant of NSFC