Bombini, Alessandro Galliani, Andrea

We compute four-point functions in the Heavy-Heavy-Light-Light limit involving all possible $\frac{1}{8}$-BPS heavy states whose dual supergravity solutions are explicitly known, avoiding the use of Witten diagrams. This is achieved by using the AdS/CFT dictionary of type IIB supergravity on AdS$_3 \times S^3 \times {\cal M}_4$ that maps supersymme...

Heidmann, Pierre Warner, Nicholas P.

Superstrata are smooth horizonless microstate geometries for the supersymmetric D1-D5-P black hole in type IIB supergravity. In the CFT, 'superstratum states' are defined to be the component of the supergraviton gas that is obtained by breaking the CFT into '$|00\rangle$-strands' and acting on each strand with the 'small,' anomaly-free superconform...

Papadopoulos, G.

We present a definition of null G-structures on Lorentzian manifolds and investigate their geometric properties. This definition includes the Robinson structure on 4-dimensional black holes as well as the null structures that appear in all supersymmetric solutions of supergravity theories. We also identify the induced geometry on some null hypersur...

Bossard, Guillaume Katmadas, Stefanos Turton, David

The study of non-supersymmetric black hole microstates offers the potential to resolve the black hole information paradox. A system of equations was recently obtained that enables the systematic construction of non-supersymmetric smooth horizonless supergravity solutions, that are candidates to describe microstates of non-extremal black holes. With...

Bena, Iosif Heidmann, Pierre Turton, David

AdS$_{2}$ plays an extremely important role in black-hole physics. We construct several infinite families of supergravity solutions that are asymptotically AdS$_{2}$ in the UV, and terminate in the IR with a cap that is singular in two dimensions but smooth in ten dimensions. These solutions break conformal invariance, and should correspond to supe...

Bena, Iosif Giusto, Stefano Martinec, Emil J. Russo, Rodolfo Shigemori, Masaki Turton, David Warner, Nicholas P.

We construct an infinite family of smooth asymptotically-flat supergravity solutions that have the same charges and angular momenta as general supersymmetric D1-D5-P black holes, but have no horizon. These solutions resemble the corresponding black hole to arbitrary accuracy outside of the horizon: they have asymptotically flat regions, $ {\mathrm{...

Bachas, Constantin Lavdas, Ioannis

We study top-down embeddings of massive Anti-de Sitter (AdS) gravity in type-IIB string theory. The supergravity solutions have a AdS$_{4}$ fiber warped over a manifold M$_{6}$ whose shape resembles that of scottish bagpipes: the ‘bag’ is a conventional AdS$_{4}$ compactification manifold, while the ‘pipes’ are highly-curved semi-infinite Janus thr...

Bena, Iosif Turton, David Walker, Robert Warner, Nicholas P.

We examine some recently-constructed families of asymptotically-AdS$_3 \times$S$^3$ 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 ...

Bena, Iosif Martinec, Emil Turton, David Warner, Nicholas P.

The low-energy description of wrapped M5 branes in compactifications of M-theory on a Calabi-Yau threefold times a circle is given by a conformal field theory studied by Maldacena, Strominger and Witten and known as the MSW CFT. Taking the threefold to be $ {\mathbb{T}}_6 $ or $ \mathrm{K}3\times {\mathbb{T}}^2 $ , we construct a map between a sub-...

Cvetic, M. Gibbons, G.W. Pope, C.N.

We study closed photon orbits in spherically symmetric static solutions of supergravity theories, a Horndeski theory, and a theory of quintessence. These orbits lie in what we shall call a photon sphere (antiphoton sphere) if the orbit is unstable (stable). We show that in all the asymptotically flat solutions we examine that admit a regular event ...