Zobrazeno 1 - 10
of 621
pro vyhledávání: '"Lüst, D."'
Publikováno v:
JHEP 0208:027,2002
We discuss a new family of metrics of 7-manifolds with G_2 holonomy, which are R^3 bundles over a quaternionic space. The metrics depend on five parameters and have two Abelian isometries. Certain singularities of the G_2 manifolds are related to fix
Externí odkaz:
http://arxiv.org/abs/hep-th/0207117
Publikováno v:
Nucl.Phys.B609:3-45,2001
We discuss the vacuum structure of type IIA/B Calabi-Yau string compactifications to four dimensions in the presence of n-form H-fluxes. These will lift the vacuum degeneracy in the Calabi-Yau moduli space, and for generic points in the moduli space,
Externí odkaz:
http://arxiv.org/abs/hep-th/0012213
Publikováno v:
Nucl.Phys.B488:236-260,1997
We use heterotic/type-II prepotentials to study quantum/classical black holes with half the $N=2, D=4$ supersymmetries unbroken. We show that, in the case of heterotic string compactifications, the perturbatively corrected entropy formula is given by
Externí odkaz:
http://arxiv.org/abs/hep-th/9610105
Publikováno v:
Nucl.Phys.B432:68-108,1994
We present the coset structure of the untwisted moduli space of heterotic $(0,2) \; Z_N$ orbifold compactifications with continuous Wilson lines. For the cases where the internal 6-torus $T_6$ is given by the direct sum $T_4 \oplus T_2$, we explicitl
Externí odkaz:
http://arxiv.org/abs/hep-th/9405002
Publikováno v:
Phys.Lett.B331:321-329,1994
We analyse the stringy gravitational wave background based on the current algebra $E^{c}_{2}$. We determine its exact spectrum and construct the modular invariant vacuum energy. The corresponding N=1 extension is also constructed. The algebra is agai
Externí odkaz:
http://arxiv.org/abs/hep-th/9404114
Autor:
Ibanez, L., Luest, D.
Publikováno v:
Phys.Lett.B302:38-46,1993
We discuss the relationship between target space modular invariance and discrete gauge symmetries in four-dimensional orbifold-like strings. First we derive the modular transformation properties of various string vertex operators of the massless stri
Externí odkaz:
http://arxiv.org/abs/hep-th/9212089
Autor:
Kounnas, C., Luest, D.
Publikováno v:
Phys.Lett.B289:56-60,1992
We discuss the four-dimensional target-space interpretation of bosonic strings based on gauged WZW models, in particular of those based on the non-compact coset space $SL(2,{\bf R})\times SO(1,1)^2 /SO(1,1)$. We show that these theories lead, apart f
Externí odkaz:
http://arxiv.org/abs/hep-th/9205046
Autor:
Luest, D.
Publikováno v:
Conf.Proc.C910725V1:307-310,1991
Some results are presented concerning duality invariant effective string actions and the construction of automorphic functions for general (2,2) string compactifications. These considerations are applied in order to discuss the {\it minimal} unificat
Externí odkaz:
http://arxiv.org/abs/hep-th/9110008
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