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45
The gauge dual of Romans mass
 JHEP
"... We deform the recently proposed holographic duality between the ABJM N = 6 ChernSimonsmatter theory and type IIA string theory in AdS4 × CP3. We add a non–zero Romans mass F0, whose dual we identify as the sum of the Chern–Simons levels for the two gauge groups. One can naturally identify four dif ..."
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Cited by 41 (1 self)
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We deform the recently proposed holographic duality between the ABJM N = 6 ChernSimonsmatter theory and type IIA string theory in AdS4 × CP3. We add a non–zero Romans mass F0, whose dual we identify as the sum of the Chern–Simons levels for the two gauge groups. One can naturally identify four different theories, with different The gauge/gravity duality proposed recently in [1] (ABJM) is the first example in which the conformal field theory (CFT) is a three–dimensional theory with an explicit Lagrangian description. The CFT3 is a Chern–Simons theory coupled to matter fields. There are two gauge groups, with Chern–Simons levels k and −k. The gravity duals are
Smeared versus localised sources in flux compactifications
 JHEP
"... We investigate whether vacuum solutions in flux compactifications that are obtained with smeared sources (orientifolds or Dbranes) still survive when the sources are localised. This seems to rely on whether the solutions are BPS or not. First we consider two sets of BPS solutions that both relate t ..."
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Cited by 31 (8 self)
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We investigate whether vacuum solutions in flux compactifications that are obtained with smeared sources (orientifolds or Dbranes) still survive when the sources are localised. This seems to rely on whether the solutions are BPS or not. First we consider two sets of BPS solutions that both relate to the GKP solution through Tdualities: (p+ 1)dimensional solutions from spacetimefilling Opplanes with a conformally Ricciflat internal space, and pdimensional solutions with Opplanes that wrap a 1cycle inside an everywhere negatively curved twisted torus. The relation between the solution with smeared orientifolds and the localised version is worked out in detail. We then demonstrate that a class of nonBPS AdS4 solutions that exist for IASD fluxes and with smeared D3branes (or analogously for ISD fluxes with antiD3branes) does not survive the localisation of the (anti) D3branes. This casts doubts on the stringy consistency of nonBPS solutions that are obtained in the limit of smeared sources. 1 ar
Open string wavefunctions in flux compactifications
, 2009
"... We consider compactifications of type I supergravity on manifolds with SU(3) structure, in the presence of RR fluxes and magnetized D9branes, and analyze the generalized Dirac and LaplaceBeltrami operators associated to the D9brane worldvolume fields. These compactifications are Tdual to standar ..."
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Cited by 18 (5 self)
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We consider compactifications of type I supergravity on manifolds with SU(3) structure, in the presence of RR fluxes and magnetized D9branes, and analyze the generalized Dirac and LaplaceBeltrami operators associated to the D9brane worldvolume fields. These compactifications are Tdual to standard type IIB toroidal orientifolds with NSNS and RR 3form fluxes and D3/D7 branes. By using techniques of representation theory and harmonic analysis, the spectrum of open string wavefunctions can be computed for Lie groups and their quotients, as we illustrate with explicit twisted tori examples. We find a correspondence between irreducible unitary representations of the KaloperMyers algebra and families of KaluzaKlein excitations. We perform the computation of 2 and 3point couplings for matter fields in the above flux compactifications, and compare our results with those of 4d effective supergravity.
A special road to AdS vacua
, 2009
"... We apply the techniques of special Kähler geometry to investigate AdS4 vacua of general N = 2 gauged supergravities underlying flux compactifications of type II theories. We formulate the scalar potential and its extremization conditions in terms of a triplet of prepotentials Px and their special Kä ..."
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Cited by 14 (2 self)
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We apply the techniques of special Kähler geometry to investigate AdS4 vacua of general N = 2 gauged supergravities underlying flux compactifications of type II theories. We formulate the scalar potential and its extremization conditions in terms of a triplet of prepotentials Px and their special Kähler covariant derivatives only, in a form that recalls the potential and the attractor equations of N = 2 black holes. We propose a system of first order equations for the Px which generalize the supersymmetry conditions and yield nonsupersymmetric vacua. Special geometry allows us to recast these equations in algebraic form, and we find an infinite class of new N = 0 and N = 1 AdS4 solutions, displaying a rich pattern of nontrivial charges associated with NSNS and RR fluxes. Finally, by explicit evaluation of the entropy function on the solutions, we derive a Uduality invariant expression for the cosmological constant and the central charges of the dual CFT’s.
Riet, “Lifshitz backgrounds from 10d supergravity
 JHEP 1002, 095 (2010) [arXiv:1001.4945 [hepth
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Towards Classical de Sitter Solutions in String Theory
, 907
"... We investigate the type II string effective potential at treelevel and derive necessary ingredients for having de Sitter solutions in orientifold models with fluxes. Furthermore, we examine some explicit O6 compactifications in IIA theory on manifolds with SU(3)structure in the limit where the ori ..."
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Cited by 8 (2 self)
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We investigate the type II string effective potential at treelevel and derive necessary ingredients for having de Sitter solutions in orientifold models with fluxes. Furthermore, we examine some explicit O6 compactifications in IIA theory on manifolds with SU(3)structure in the limit where the orientifold sources are smeared. In particular, we use a simple tendimensional Ansatz for fourdimensional de Sitter solutions and find the explicit criteria in terms of the torsion classes such that these de Sitter solutions solve the equations of motion. We have verified these torsion conditions for the cosets and the Iwasawa manifold and it turns out that the conditions cannot be fulfilled for these spaces. However this investigation allows us to find new nonsupersymmetric AdS solutions for some cosets. It remains an open question whether there exist SU(3)structure manifolds that satisfy the conditions on the torsion classes for the simple de Sitter solutions to exist. Contents