Abstract
In this paper we study non-perturbative instabilities in Anti-de Sitter vacua arising from flux compactifications of string models with broken supersymmetry. In the semi-classical limit, these processes drive the vacua towards lower fluxes, which translate into higher curvatures and higher string couplings. In order to shed some light on this regime, we provide evidence for a description in terms of branes, which generate near- horizon AdS throats. To this end, we study the attractor properties of the geometries near the throat, and we also characterize their asymptotics away from it. We also describe the instability within a probe-brane picture, finding an agreement between low-energy (super)gravity and brane instanton estimates of the decay rates.
Highlights
Background geometry we study the background geometry generated by a stack of branes in the family of models described by eq (2.1)
In this paper we have studied non-perturbative instabilities of Anti de-Sitter (AdS) vacua that arise in nonsupersymmetric orientifolds, where large fluxes can provide regimes where computations are under control, and we have computed the corresponding semi-classical decay rates
We have provided evidence for this microscopic picture studying both the behaviour of probe branes and the geometry generated by the stack
Summary
We present the (super)gravity theories related to the string vacua at stake and their AdS × S solutions. The dilaton is stabilized to a constant value by the electric form flux on the sphere,. From eq (2.14) one can observe that the ratio of the curvature radii is a constant independent on n but is not necessarily unity, in contrast with the case of the supersymmetric AdS5 × S5 solution of Type IIB supergravity. These solutions exhibit a number of interesting features. To begin with, they only exist in the presence of the dilaton potential, and they have no counterpart in the supersymmetric case for p = 3.
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