Dimers and orientifolds
نویسندگان
چکیده
منابع مشابه
F Theory Orientifolds, M Theory Orientifolds, and Twisted Strings
Orientifolds of the type IIB superstring that descend from F theory and M theory orbifolds are studied perturbatively. One finds strong evidence that a previously ignored twisted open string is required in these models. An attempt is made to interpret the J type torsion in F theory where one finds a realization of Gimon and Johnson’s models which does not require these twisted strings. S-dualit...
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Recently it has been shown that D-branes in orientifolds are not always described by equivariant Real K–theory. In this paper we define a previously unstudied twisted version of equivariant Real K–theory which gives the Dbrane spectrum for such orientifolds. We find that equivariant Real K–theory can be twisted by elements of a generalised group cohomology. This cohomology classifies all orient...
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By analyzing F-theory on K3 near the orbifold limit of K3 we establish the equivalence between F-theory on K3 and an orientifold of type IIB on T 2 , which in turn, is related by a T-duality transformation to type I theory on T 2. By analyzing the F-theory background away from the orbifold limit, we show that non-perturbative effects in the orientifold theory splits an orientifold plane into tw...
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We consider orientifold actions involving the permutation of two identical factor theories. The corresponding crosscap states are constructed in rational conformal field theory. We study group manifolds, in particular the examples SU(2)×SU(2) and U(1)×U(1) in detail, comparing conformal field theory results with geometry. We then consider orientifolds of tensor products of N = 2 minimal models,...
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ژورنال
عنوان ژورنال: Journal of High Energy Physics
سال: 2007
ISSN: 1029-8479
DOI: 10.1088/1126-6708/2007/09/075