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19912026
Showing 2008 · hep-thShow all

23 papers · 2 filters

hep-th2008★ 80 cited

Supertubes in Bubbling Backgrounds: Born-Infeld Meets Supergravity

Iosif Bena, Nikolay Bobev, Clement Ruef +1

We discuss two ways in which one can study two-charge supertubes as components of generic three-charge, three-dipole charge supergravity solutions. The first is using the Born-Infe…

hep-th2008★ 22 cited

Topology Change from (Heterotic) Narain T-Duality

Jarah Evslin, Ruben Minasian

We consider Narain T-duality on a nontrivially fibered n-torus bundle in the presence of a topologically nontrivial NS H flux. The action of the duality group on the topology and H…

hep-th2008★ 62 cited

Particle decays and stability on the de Sitter universe

Jacques Bros, Henri Epstein, Ugo Moschella

We study particle decay in de Sitter space-time as given by first order perturbation theory in a Lagrangian interacting quantum field theory. We study in detail the adiabatic limit…

hep-th2008★ 13 cited

Boundary operators in the O(n) and RSOS matrix models

J. -E. Bourgine, K. Hosomichi

We study the new boundary condition of the O(n) model proposed by Jacobsen and Saleur using the matrix model. The spectrum of boundary operators and their conformal weights are obt…

hep-th2008★ 54 cited

Black Rings in Taub-NUT and D0-D6 interactions

Joan Camps, Roberto Emparan, Pau Figueras +2

We analyze the dynamics of neutral black rings in Taub-NUT spaces and their relation to systems of D0 and D6 branes in the supergravity approximation. We employ several recent tech…

hep-th2008★ 46 cited

Linear perturbations of quaternionic metrics

Sergei Alexandrov, Boris Pioline, Frank Saueressig +1

We extend the twistor methods developed in our earlier work on linear deformations of hyperkahler manifolds [arXiv:0806.4620] to the case of quaternionic-Kahler manifolds. Via Swan…

hep-th2008★ 14 cited

Stringy Instantons as Strong Dynamics

Antonio Amariti, Luciano Girardello, Alberto Mariotti

We study the relation between stringy instantons and strong dynamics effects in type IIB toric quiver gauge theories. By exploiting the involutive property of Seiberg duality we re…

hep-th2008★ 118 cited

Generalized unitarity for N=4 super-amplitudes

J. M. Drummond, J. Henn, G. P. Korchemsky +1

We develop a manifestly supersymmetric version of the generalized unitarity cut method for calculating scattering amplitudes in N=4 SYM theory. We illustrate the power of this meth…

hep-th2008★ 66 cited

Comment on the Scaling Function in AdS4 x CP3

Nikolay Gromov, Victor Mikhaylov

The folded spinning string in AdS3 gives us an important insight into AdS/CFT duality. Recently its one-loop energy was analyzed in the context of AdS4/CFT3 by McLoughlin and Roiba…

hep-th2008★ 214 cited

T-duality, Generalized Geometry and Non-Geometric Backgrounds

Mariana Graña, Ruben Minasian, Michela Petrini +1

We discuss the action of O(d,d), and in particular T-duality, in the context of generalized geometry, focusing on the description of so-called non-geometric backgrounds. We derive…

hep-th2008★ 197 cited

The all loop AdS4/CFT3 Bethe ansatz

Nikolay Gromov, Pedro Vieira

We propose a set of Bethe equations yielding the full asymptotic spectrum of the AdS4/CFT3 duality proposed in arXiv:0806.1218 to all orders in the t'Hooft coupling. These equation…

hep-th2008★ 24 cited

On Cancellations of Ultraviolet Divergences in Supergravity Amplitudes

N. E. J. Bjerrum-Bohr, Pierre Vanhove

Concrete calculations have pointed out that amplitudes in perturbative gravity exhibit unanticipated cancellations taming their ultraviolet behaviour independently of supersymmetry…

hep-th2008★ 110 cited

The AdS4/CFT3 algebraic curve

Nikolay Gromov, Pedro Vieira

We present the OSp(2,2|6) symmetric algebraic curve for the AdS4/CFT3 duality recently proposed in arXiv:0806.1218. It encodes all classical string solutions at strong t'Hooft coup…

hep-th2008★ 47 cited

Entropy Enhancement and Black Hole Microstates

Iosif Bena, Nikolay Bobev, Clement Ruef +1

We study fluctuating two-charge supertubes in three-charge geometries. We show that the entropy of these supertubes is determined by their locally-defined effective charges, which…

hep-th2008★ 63 cited

Spectral Flow, and the Spectrum of Multi-Center Solutions

Iosif Bena, Nikolay Bobev, Nicholas P. Warner

We discuss "spectral flow" coordinate transformations that take asymptotically four-dimensional solutions into other asymptotically four-dimensional solutions. We find that spectra…

hep-th2008★ 18 cited

Brane Inflation and Defect Formation

A. C. Davis, P. Brax, C. van de Bruck

Brane inflation and the production of topological defects at the end of the inflationary phase are discussed. After a description of the inflationary setup we discuss the propertie…

hep-th2008★ 351 cited

The Two-Loop Six-Gluon MHV Amplitude in Maximally Supersymmetric Yang-Mills Theory

Z. Bern, L. J. Dixon, D. A. Kosower +4

We give a representation of the parity-even part of the planar two-loop six-gluon MHV amplitude of N=4 super-Yang-Mills theory, in terms of loop-momentum integrals with simple dual…

hep-th2008★ 9 cited

Metastable vacua and geometric deformations

A. Amariti, D. Forcella, L. Girardello +1

We study the geometric interpretation of metastable vacua for systems of D3 branes at non isolated toric deformable singularities. Using the L^{aba} examples, we investigate the re…

hep-th2008★ 63 cited

Quantum Wrapped Giant Magnon

Nikolay Gromov, Sakura Schafer-Nameki, Pedro Vieira

Understanding the finite-size corrections to the fundamental excitations of a theory is the first step towards completely solving for the spectrum in finite volume. We compute the…

hep-th2008★ 61 cited

Functional BES equation

Ivan Kostov, Didina Serban, Dmytro Volin

We give a realization of the Beisert, Eden and Staudacher equation for the planar N=4 supersymetric gauge theory whichseems to be particularly useful to study the strong coupling l…

hep-th2008★ 20 cited

A lattice approach to the conformal $\OSp(2S+2|2S)$ supercoset sigma model. Part II: The boundary spectrum

Constantin Candu, Hubert Saleur

We consider the partition function of the boundary coset sigma model on an annulus, based on the lattice regularization introduced in the companion paper. Using resu…

hep-th2008★ 26 cited

A lattice approach to the conformal $\OSp(2S+2|2S)$ supercoset sigma model. Part I: Algebraic structures in the spin chain. The Brauer algebra

Constantin Candu, Hubert Saleur

We define and study a lattice model which we argue is in the universality class of the supercoset sigma model for a large range of values of the coupling constant $g…

hep-th2008★ 12 cited

Successfully combining SUGRA hybrid inflation and moduli stabilisation

Stephen C. Davis, M. Postma

Inflation and moduli stabilisation mechanisms work well independently, and many string-motivated supergravity models have been proposed for them. However a complete theory will con…