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Search: authors:"Mariana Graña"

18 papers found.
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Generalized geometric vacua with eight supercharges

We investigate compactifications of type II and M-theory down to AdS 5 with generic fluxes that preserve eight supercharges, in the framework of Exceptional Generalized Geometry. The geometric data and gauge fields on the internal manifold are encoded in a pair of generalized structures corresponding to the vector and hyper-multiplets of the reduced five-dimensional supergravity...

The bosonic string on string-size tori from double field theory

We construct the effective action for toroidal compactifications of bosonic string theory from generalized Scherk-Schwarz reductions of double field theory. The enhanced gauge symmetry arising at special points in moduli space is incorporated into this framework by promoting the O(k, k) duality group of k-tori compactifications to O(n, n), n being the dimension of the enhanced...

Exactly marginal deformations from exceptional generalised geometry

We apply exceptional generalised geometry to the study of exactly marginal deformations of \( \mathcal{N} \) = 1 SCFTs that are dual to generic AdS5 flux backgrounds in type IIB or eleven-dimensional supergravity. In the gauge theory, marginal deformations are parametrised by the space of chiral primary operators of conformal dimension three, while exactly marginal deformations...

M-theory moduli spaces and torsion-free structures

Motivated by the description of \( \mathcal{N}=1 \) M-theory compactifications to four-dimensions given by Exceptional Generalized Geometry, we propose a way to geometrize the M-theory fluxes by appropriately relating the compactification space to a higher-dimensional manifold equipped with a torsion-free structure. As a non-trivial example of this proposal, we construct a...

Fermionic and bosonic mass deformations of \( \mathcal{N} \) = 4 SYM and their bulk supergravity dual

We examine the AdS-CFT dual of arbitrary (non)supersymmetric fermionic mass deformations of \( \mathcal{N} \) = 4 SYM, and investigate how the backreaction of the RR and NS-NS two-form potentials dual to the fermion masses contribute to Coulomb-branch potential of D3 branes, which we interpret as the bulk boson mass matrix. Using representation theory and supergravity arguments...

Spin(7)-manifolds in compactifications to four dimensions

We describe off-shell \( \mathcal{N}=1 \) M-theory compactifications down to four dimensions in terms of eight-dimensional manifolds equipped with a topological Spin(7)-structure. Motivated by the exceptionally generalized geometry formulation of M-theory compactifications, we consider an eight-dimensional manifold \( {\mathrm{\mathcal{M}}}_8 \) equipped with a particular set of...

Generalized N = 1 and N = 2 structures in M-theory and type II orientifolds

We consider M-theory and type IIA reductions to four dimensions with N = 2 and N = 1 supersymmetry and discuss their interconnection. Our work is based on the framework of Exceptional Generalized Geometry (EGG), which extends the tangent bundle to include all symmetries in M-theory and type II string theory, covariantizing the local U-duality group E 7(7). We describe general N...

\( \mathcal{N} \) = 2 vacua in generalized geometry

We find the conditions on compactifications of type IIA to four-dimensional Minkowski space to preserve \( \mathcal{N} \) = 2 supersymmetry in the language of Exceptional Generalized Geometry (EGG) and Generalized Complex Geometry (GCG). In EGG, off-shell \( \mathcal{N} \) =2 supersymmetry requires the existence of a pair of SU(2)R singlet and triplet algebraic structures on the...

Giant tachyons in the landscape

We study the dynamics of localized and fully backreacting anti-D3 branes at the tip of the Klebanov-Strassler geometry. We use a non-supersymmetric version of the Polchinski-Strassler analysis to compute the potential for anti-D3 branes to polarize into all kinds of five-brane shells in all possible directions. We find that generically there is a direction along which the brane...

Quantum corrections in string compactifications on SU(3) structure geometries

We investigate quantum corrections to the classical four-dimensional low-energy effective action of type II string theory compactified on SU(3) structure geometries. Various methods previously developed for Calabi-Yau compactifications are adopted to constrain - under some simple assumptions about the low-energy degrees of freedom - the leading perturbative corrections to the...

Gauged double field theory

We find necessary and sufficient conditions for gauge invariance of the action of Double Field Theory (DFT) as well as closure of the algebra of gauge symmetries. The so-called weak and strong constraints are sufficient to satisfy them, but not necessary. We then analyze compactifications of DFT on twisted double tori satisfying the consistency conditions. The effective theory is...

Tachyonic anti-M2 branes

We study the dynamics of anti-M2 branes in a warped Stenzel solution with M2 charges dissolved in fluxes by taking into account their full backreaction on the geometry. The resulting supergravity solution has a singular magnetic four-form flux in the near-brane region. We examine the possible resolution of this singularity via the polarization of anti-M2 branes into M5 branes...

Polchinski-Strassler does not uplift Klebanov-Strassler

Anti-D3-branes at the tip of the Klebanov-Strassler solution with D3-charge dissolved in fluxes give rise, in the probe approximation, to a metastable state. The fully back-reacted smeared solution has singular three-form fluxes in the IR, whose presence suggests a stringy resolution by brane polarization à la Polchinski-Strassler. In this paper we show that there is no...

The backreaction of anti-D3 branes on the Klebanov-Strassler geometry

We present the full numerical solution for the 15-dimensional space of linearized deformations of the Klebanov-Strassler background which preserve the SU(2) × SU(2) × \( {{\mathbb{Z}}_2} \) symmetries. We identify within this space the solution corresponding to anti-D3 branes, (modulo the presence of a certain “subleading” singularity in the infrared). All the 15 integration...

On the inflaton potential from antibranes in warped throats

We compute the force between a stack of smeared antibranes at the bottom of a warped throat and a stack of smeared branes at some distance up the throat, both for anti-D3 branes and for anti-M2 branes. We perform this calculation in two ways: first, by treating the antibranes as probes in the background sourced by the branes and second, by treating the branes as probes in the...

On the existence of meta-stable vacua in Klebanov-Strassler

We solve for the complete space of linearized deformations of the Klebanov-Strassler background consistent with the symmetries preserved by a stack of anti-D3 branes smeared on the S 3 of the deformed conifold. We find that the only solution whose UV physics is consistent with that of a perturbation produced by anti-D3 branes must have a singularity in the infrared, coming from...

Supersymmetric consistent truncations of IIB on T 1,1

We study consistent Kaluza-Klein reductions of type IIB supergravity on T 1,1 down to five-dimensions. We find that the most general reduction containing singlets under the global SU(2) × SU(2) symmetry of T 1,1 is \( \mathcal{N} = 4 \) gauged supergravity coupled to three vector multiplets with a particular gauging due to topological and geometric flux. Key to this reduction is...