Zobrazeno 1 - 10
of 123
pro vyhledávání: '"Bershadsky, M."'
Publikováno v:
Nucl.Phys. B567 (2000) 61-86
We quantize the superstring on the AdS_2 x S^2 background with Ramond-Ramond flux using a PSU(1,1|2)/U(1) x U(1) sigma model with a WZ term. One-loop conformal invariance of the model is guaranteed by a general mechanism which holds for coset spaces
Externí odkaz:
http://arxiv.org/abs/hep-th/9907200
Publikováno v:
Nucl.Phys. B527 (1998) 531-570
We present an explicit method for translating between the linear sigma model and the spectral cover description of SU(r) stable bundles over an elliptically fibered Calabi-Yau manifold. We use this to investigate the 4-dimensional duality between (0,
Externí odkaz:
http://arxiv.org/abs/hep-th/9712023
Publikováno v:
Nucl.Phys. B505 (1997) 153-164
We consider geometric engineering of N=1 supersymmetric QFTs with matter in terms of a local model for compactification of F-theory on Calabi-Yau fourfold. By bringing 3-branes near 7-branes we engineer N=1 supersymmetric $SU(N_c)$ gauge theory with
Externí odkaz:
http://arxiv.org/abs/hep-th/9612052
Publikováno v:
Nucl.Phys.B481:215-252,1996
Using ``Tate's algorithm,'' we identify loci in the moduli of F-theory compactifications corresponding to enhanced gauge symmetry. We apply this to test the proposed F-theory/heterotic dualities in six dimensions. We recover the perturbative gauge sy
Externí odkaz:
http://arxiv.org/abs/hep-th/9605200
Publikováno v:
Nucl.Phys. B463 (1996) 420-434
In the presence of a D-brane a string theory develops a new subsector. We show that for curved D-branes the corresponding sector is a (partially twisted) topological field theory. We use this result to compute the degeneracy of 2-branes wrapped aroun
Externí odkaz:
http://arxiv.org/abs/hep-th/9511222
Publikováno v:
Nucl.Phys. B463 (1996) 398-414
We study the mechanism for appearance of massless solitons in type II string compactifications. We find that by combining $T$-duality with strong/weak duality of type IIB in 10 dimensions enhanced gauge symmetries and massless solitonic hypermultiple
Externí odkaz:
http://arxiv.org/abs/hep-th/9510225
Publikováno v:
Nucl.Phys. B448 (1995) 166-186
By considering a (partial) topological twisting of supersymmetric Yang-Mills compactified on a 2d space with `t Hooft magnetic flux turned on we obtain a supersymmetric $\sigma$-model in 2 dimensions. For N=2 SYM this maps Donaldson observables on pr
Externí odkaz:
http://arxiv.org/abs/hep-th/9501096
Publikováno v:
Commun.Math.Phys.165:311-428,1994
We develop techniques to compute higher loop string amplitudes for twisted $N=2$ theories with $\hat c=3$ (i.e. the critical case). An important ingredient is the discovery of an anomaly at every genus in decoupling of BRST trivial states, captured t
Externí odkaz:
http://arxiv.org/abs/hep-th/9309140
Publikováno v:
Nucl.Phys.B405:279-304,1993
We study the stringy genus one partition function of $N=2$ SCFT's. It is shown how to compute this using an anomaly in decoupling of BRST trivial states from the partition function. A particular limit of this partition function yields the partition f
Externí odkaz:
http://arxiv.org/abs/hep-th/9302103
Publikováno v:
Nucl.Phys. B401 (1993) 304-347
We show that almost all string theories, including the bosonic string, the superstring and $W$-string theories, possess a twisted N=2 superconformal symmetry. This enables us to establish a connection between topological gravity and the field theoret
Externí odkaz:
http://arxiv.org/abs/hep-th/9211040