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Dbranes on AdS flux compactifications
, 2007
"... We study Dbranes in N = 1 flux compactifications to AdS4. We derive their supersymmetry conditions and express them in terms of background generalized calibrations. Basically because AdS has a boundary, the analysis of stability is more subtle and qualitatively different from the usual case of Min ..."
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We study Dbranes in N = 1 flux compactifications to AdS4. We derive their supersymmetry conditions and express them in terms of background generalized calibrations. Basically because AdS has a boundary, the analysis of stability is more subtle and qualitatively different from the usual case of Minkowski compactifications. For instance, stable Dbranes filling AdS4 may wrap trivial internal cycles. Our analysis gives a geometric realization of the fourdimensional field theory approach of Freedman and collaborators. Furthermore, the onetoone correspondence between the supersymmetry conditions of the background and the existence of generalized calibrations for Dbranes is clarified and extended to any supersymmetric flux background that admits a timelike Killing vector and for which all fields are timeindependent with respect to the associated time. As explicit examples, we discuss supersymmetric Dbranes on IIA nearly Kähler AdS4 flux compactifications.
STRING THEORY LANDSCAPE AND THE STANDARD MODEL OF PARTICLE PHYSICS
, 2007
"... In this paper we describe ideas about the string landscape, and how to relate it to the physics of the Standard Model of particle physics. First, we give a short status report about heterotic string compactifications. Then we focus on the statistics of Dbrane models, on the problem of moduli stabil ..."
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In this paper we describe ideas about the string landscape, and how to relate it to the physics of the Standard Model of particle physics. First, we give a short status report about heterotic string compactifications. Then we focus on the statistics of Dbrane models, on the problem of moduli stabilization, and finally on some attempts to derive a probability wave function in moduli space, which goes beyond the purely statistical count of string vacua.
ArnoldSommerfeldCenter for Theoretical Physics
"... Abstract: We study cosmological properties of type IIA compactifications on orientifolds of SU(3)structure manifolds with nonvanishing geometric flux. These compactifications give rise to effective 4D N = 1 supergravity theories that do not fall under some recentlyproven nogo theorems against de ..."
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Abstract: We study cosmological properties of type IIA compactifications on orientifolds of SU(3)structure manifolds with nonvanishing geometric flux. These compactifications give rise to effective 4D N = 1 supergravity theories that do not fall under some recentlyproven nogo theorems against de Sitter vacua and slowroll inflation. Focusing on a wellunderstood class of models based on coset spaces, however, we can use a refined nogo theorem that rules out de Sitter vacua and slowroll inflation in all but one case. The refined nogo theorem uses the dilaton and a specific linear combination of the Kähler moduli, which is different from the overall volume modulus. It puts a lower bound on the first slowroll parameter: ǫ ≥ 2. The only case not ruled out is the manifold SU(2)×SU(2), for which we indeed find critical points with ǫ numerically zero. However, all the points we could find have a tachyon corresponding to an etaparameter η � −2.4.
Classes of AdS4 type IIA/IIB compactifications
, 901
"... with SU(3)×SU(3) structure ..."
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ArnoldSommerfeldCenter for Theoretical Physics
, 905
"... Abstract: We write down the general conditions for N = 1 supersymmetric four– dimensional domain walls, deriving them from a ten–dimensional point of view using generalized complex geometry. In cases where the compactification allows for a truncation to a finite number of fields, we make contact wit ..."
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Abstract: We write down the general conditions for N = 1 supersymmetric four– dimensional domain walls, deriving them from a ten–dimensional point of view using generalized complex geometry. In cases where the compactification allows for a truncation to a finite number of fields, we make contact with a four–dimensional effective description. In the context of the AdS/CFT correspondence, the equations can be applied to renormalization–group flows of three–dimensional field theories. We allow for the presence of explicit brane sources and show how supersymmetry restricts their location in a natural way. Keywords: Anti–de Sitter vacua, AdS/CFT duality. Contents