Strings and D‐branes in holographic backgrounds

Israël, Dan

doi:10.1002/prop.200410215

Cited by 4 publications

(13 citation statements)

References 56 publications

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“…The issue of geometric cosets as exact backgrounds has been recently revisited in [5]. There, it was shown that S 2 ≡ SU (2)/U (1) and AdS 2 ≡ SL(2, R)/U (1) space , with magnetic and electric fluxes and no dilaton, can be obtained as extreme marginal deformations of the SU (2) k and SL(2, R)k wzw models.…”

Section: Motivations and Summarymentioning

confidence: 99%

“…From this form of the deformed metric we see that there is a "natural" maximal value h a = 1/ √ 2 where the contribution of the J a ⊗ J a term changes its sign and the signature of the metric is thus changed. One could naively think that the maximal value h a = 1/ √ 2 can't be attained since the this would correspond to a degenerate manifold of lower dimension; what actually happens is that the deformation selects the the maximal torus that decouples in the h a = h → 1/ √ 2 limit as it was shown in [5] for the SU (2) and SL (2, R) algebras.…”

Section: Asymmetric Deformationsmentioning

confidence: 99%

“…In this section we will give some explicit examples of our construction. In particular we will consider the deformation leading from the SU (2) background to the SU (2)/U (1) ∼ S 2 coset (which already appeared in [5] as part of the AdS 2 ×S 2 background) and the superconformal field theory on SU (3)/U (1) 2 . Although our construction is quite general and can in principle be applied to any group there is a limited number of examples giving critical heterotic string theory backgrounds with a clear geometrical meaning.…”

Section: Some Examplesmentioning

confidence: 99%

“…In particular, then, we can pick the subalgebra generated by k = λ 3 , λ 8 . 5 We can now specialize the general expressions given in Sect. 2.…”

Section: The Su(3)/u(1) Flag Spacementioning

confidence: 99%

“…In this section we want to show how the S 2 background described in [5] can be directly obtained via an asymmetric gauging of the SU (2) × U (1) wzw model (a similar construction was first obtained in [2]).…”

Section: The Su(2)/u(1) Asymmetric Gaugingmentioning

confidence: 99%

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Heterotic strings on homogeneous spaces

Israël

Kounnas

Orlando³

et al. 2005

Fortschritte der Physik

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We construct heterotic string backgrounds corresponding to families of homogeneous spaces as exact conformal field theories. They contain left cosets of compact groups by their maximal tori supported by NS-NS 2-forms and gauge field fluxes. We give the general formalism and modular-invariant partition functions, then we consider some examples such as SU(2)/U(1) ~ S^2 (already described in a previous paper) and the SU(3)/U(1)^2 flag space. As an application we construct new supersymmetric string vacua with magnetic fluxes and a linear dilaton.Comment: JHEP style; 47 pages, one figur

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Section: Motivations and Summarymentioning

confidence: 99%

Section: Asymmetric Deformationsmentioning

confidence: 99%

Section: Some Examplesmentioning

confidence: 99%

“…In particular, then, we can pick the subalgebra generated by k = λ 3 , λ 8 . 5 We can now specialize the general expressions given in Sect. 2.…”

Section: The Su(3)/u(1) Flag Spacementioning

confidence: 99%

Section: The Su(2)/u(1) Asymmetric Gaugingmentioning

confidence: 99%

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Heterotic strings on homogeneous spaces

Israël

Kounnas

Orlando³

et al. 2005

Fortschritte der Physik

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NS5-branes on an ellipsis and novel marginal deformations with parafermions

Petropoulos¹,

Sfetsos²

2006

J. High Energy Phys.

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We consider NS5-branes distributed along the circumference of an ellipsis and explicitly construct the corresponding gravitational background. This provides a continuous line of deformations between the limiting cases, considered before, in which the ellipsis degenerates into a circle or into a bar. We show that a slight deformation of the background corresponding to a circle distribution into an ellipsoidal one is described by a novel non-factorizable marginal perturbation of bilinears of dressed parafermions. The latter are naturally defined for the circle case since, as it was shown in the past, the background corresponds to an orbifold of the exact conformal field theory coset model SU(2)/U(1) × SL(2, R)/U(1). We explore the possibility to define parafermionic objects at generic points of the ellipsoidal families of backgrounds away from the circle point. We also discuss a new limiting case in which the ellipsis degenerates into two infinitely stretched parallel bars and show that the background is related to the Eguchi-Hanson metric, via T-duality.

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Non-Abelian coset string backgrounds from asymptotic and initial data

Petropoulos¹,

Sfetsos²

2007

J. High Energy Phys.

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We describe hierarchies of exact string backgrounds obtained as non-Abelian cosets of orthogonal groups and having a space-time realization in terms of gauged WZW models. For each member in these hierarchies, the target-space backgrounds are generated by the "boundary" backgrounds of the next member. We explicitly demonstrate that this property holds to all orders in α ′ . It is a consequence of the existence of an integrable marginal operator build on, generically, non-Abelian parafermion bilinears. These are dressed with the dilaton supported by the extra radial dimension, whose asymptotic value defines the boundary. Depending on the hierarchy, this boundary can be time-like or space-like with, in the latter case, potential cosmological applications.

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Strings and D‐branes in holographic backgrounds

Cited by 4 publications

References 56 publications

Heterotic strings on homogeneous spaces

Heterotic strings on homogeneous spaces

NS5-branes on an ellipsis and novel marginal deformations with parafermions

Non-Abelian coset string backgrounds from asymptotic and initial data

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