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Hierarchies from fluxes in string compactifications

TLDR
In this article, the authors show that the hierarchy of scales can be fixed by a choice of Ramond-Ramond and Neveu-Schwarz fluxes in the compact manifold, and give examples involving orientifold compactifications of type IIB string theory and F-theory compactifications on Calabi-Yau fourfolds.
Abstract
Warped compactifications with significant warping provide one of the few known mechanisms for naturally generating large hierarchies of physical scales. We demonstrate that this mechanism is realizable in string theory, and give examples involving orientifold compactifications of type-IIB string theory and F-theory compactifications on Calabi-Yau fourfolds. In each case, the hierarchy of scales is fixed by a choice of Ramond-Ramond and Neveu-Schwarz fluxes in the compact manifold. Our solutions involve compactifications of the Klebanov-Strassler gravity dual to a confining $\mathcal{N}=1$ supersymmetric gauge theory, and the hierarchy reflects the small scale of chiral symmetry breaking in the dual gauge theory.

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Cosmic Superstrings

TL;DR: The properties of cosmic superstring networks are studied and their phenomenological consequences against observational data are compared to pin down the successful and natural inflationary model and get an insight into the stringy description of the authors' Universe.
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Moduli stabilization and cosmology of type IIB on SU(2)-structure orientifolds

TL;DR: In this article, the authors consider type IIB flux compactifications on six-dimensional SU(2)-structure manifolds with O5-and O7-planes and derive the four-dimensional $$ \mathcal {N} $$ウス = 1 scalar potential for such compactifications and present one explicit example of a fully stabilized AdS vacuum with large volume and small string coupling.
Posted Content

A)dS Backgrounds from Asymmetric Orientifolds

TL;DR: In this article, an asymmetric orientifold model with RR fluxes is proposed to fix all the NS NS moduli including the dilaton, which leads to a promising candidate for a metastable de Sitter background with string coupling of order 1/10 and dS radius of order 100 times the string scale.
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Low energy supersymmetry from the landscape

TL;DR: In this paper, the authors argue that the landscape seems to favor low energy supersymmetry at a very low scale, quite possibly at a tree level and non-perturbative effects.
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Chaotic inflation on the brane with induced gravity

TL;DR: In this article, the slow-roll inflationary dynamics in a self-gravitating induced gravity braneworld model with a bulk cosmological constant was studied and important corrections to the four-dimensional Friedmann equation were found.
References
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Journal ArticleDOI

The Large N limit of superconformal field theories and supergravity

TL;DR: In this article, it was shown that the large-N limits of certain conformal field theories in various dimensions include in their Hilbert space a sector describing supergravityon the product of anti-de Sitter spacetimes, spheres, and other compact manifolds.
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Large Mass Hierarchy from a Small Extra Dimension

TL;DR: In this paper, the weak scale is generated from the Planck scale through an exponential hierarchy, but this exponential arises not from gauge interactions but from the background metric, which is a slice of spacetime.
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An Alternative to compactification

TL;DR: In this paper, a single 3-brane embedded in five dimensions was shown to reproduce four-dimensional Newtonian and general relativistic gravity to more than adequate precision, even without a gap in the Kaluza-Klein spectrum.
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Supergravity and a confining gauge theory: duality cascades and χSB-resolution of naked singularities

TL;DR: In this article, a non-singular pure-supergravity background dual to the field theory on all scales, with small curvature everywhere if the ‘t Hooft coupling gsM is large, was proposed.
Journal ArticleDOI

Superconformal field theory on threebranes at a Calabi-Yau singularity

TL;DR: In this paper, it was shown that string theory on AdS5 × X5 can be described by a certain N = 1 supersymmetric gauge theory, which we describe in detail.
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