Iosif Bena

Integrability and black-hole microstate geometries

A bstractWe examine some recently-constructed families of asymptotically-AdS3 × S3

Momentum fractionation on superstrata

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Non-BPS multi-bubble microstate geometries

supergravity solutions that have the same charges and mass as supersymmetric D1-D5- P black holes, but that cap off smoothly with no horizon. These solutions, known as superstrata, are quite complicated, however we show that, for an infinite family of solutions, the null geodesic problem is completely integrable, due to the existence of a non-trivial conformal Killing tensor that provides a quadratic conservation law for null geodesics. This implies that the massless scalar wave equation is separable. For another infinite family of solutions, we find that there is a non-trivial conformal Killing tensor only when the left-moving angular momentum of the massless scalar is zero. We also show that, for both these families, the metric degrees of freedom have the form they would take if they arose from a consistent truncation on S3

Loop corrections to the antibrane potential

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M-theory Superstrata and the MSW String

down to a (2 + 1)-dimensional space-time. We discuss some of the broader consequences of these special properties for the physics of these black-hole microstate geometries.

A systematic construction of microstate geometries with low angular momentum

When D-branes are inserted in flux backgrounds of opposite charge, the resulting solution has a certain singularity in the fluxes. Recently it has been argued, using numerical solutions, that for anti-D3 branes in the KlebanovStrassler background these singularities cannot be cloaked by a horizon, which strongly suggests they are not physical. In this note we provide an analytic proof that the singularity of all codimension-three antibrane solutions (such as anti-D6 branes in massive type IIA supergravity or anti-D3 branes smeared on the T of R × T with fluxes) cannot be hidden behind a horizon, and that the charge of black branes with smooth event horizons must have the same sign as the charge of the flux background. Our result indicates that infinitesimally blackening the antibranes immediately triggers brane-flux annihilation, and strengthens the intuition that antibranes placed in flux with positive charge immediately annihilate against it. iosif.bena @ cea.fr, johan.blaback, ulf.danielsson @ physics.uu.se, thomasvr @ itf.fys.kuleuven.be 1 ar X iv :1 30 1. 70 71 v1 [ he pth ] 2 9 Ja n 20 13