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- José Figueroa-O’Farrill, Joan Simón
- 2001

We study generalised supersymmetric fluxbranes in type II string theory obtained as Kaluza–Klein reductions of the Minkowski space vacuum of eleven-dimensional supergravity. We obtain a six-parameter family of smooth solutions which contains all the known solutions, new solutions called nullbranes, and solutions interpolating between them.

- Nadav Drukker, Bartomeu Fiol, Joan Simón
- Physical review letters
- 2003

We demonstrate that certain supersymmetric Gödel-like universe solutions of supergravity are not solutions of string theory. This is achieved by realizing that supertubes are Bogomol'nyi-Prasad-Sommerfeld states in these spaces, and under certain conditions, when wrapping closed timelike curves, some world-volume modes develop negative kinetic terms. Since… (More)

- Joan Simón
- 2002

We study M/D-branes in a null-brane background. By taking a near horizon limit, one is left with cosmological models in the corresponding Poincaré patches. To deal with their usual horizons, we either extend these models to global AdS or remain in the Poincaré patch and apply a T-duality transformation whenever the effective radius of the compact dimension… (More)

We show that heavy pure states of gravity can appear to be mixed states to almost all probes. For AdS5 Schwarzschild black holes, our arguments are made using the field theory dual to string theory in such spacetimes. Our results follow from applying information theoretic notions to field theory operators capable of describing very heavy states in gravity.… (More)

We examine a stationary but non-static asymptotically AdS3 spacetime with two causally connected conformal boundaries, each of which is a “null cylinder”, namely a cylinder with a null direction identified. This spacetime arises from three different perspectives: (i) as a non-singular, causally regular orbifold of global AdS3 by boosts, (ii) as a… (More)

The half-BPS sector of Yang-Mills theory with 16 supercharges is integrable: there is a set of commuting conserved charges, whose eigenvalues can completely identify a state. We show that these charges can be measured in the dual gravitational description from asymptotic multipole moments of the spacetime. However, Planck scale measurements are required to… (More)

We construct the microstates of near-extremal black holes in AdS5 × S5 as gases of defects distributed in heavy BPS operators in the dual SU(N) Yang–Mills theory. These defects describe open strings on spherical D3-branes in the S5, and we show that they dominate the entropy by directly enumerating them and comparing the results with a partition sum… (More)

- Jordi López-Pujol, María Bosch, Joan Simón, César Blanché
- Annals of botany
- 2004

BACKGROUND AND AIMS
Thymus loscosii (Lamiaceae) is a tetraploid perennial species endemic to the Ebro river basin (north-eastern Spain), which is included in the National Catalogue of Endangered Species. It is a tetraploid species (2n = 54), presumably an autotetraploid originated by the duplication of a 2n = 28 genome and the subsequent loss of two… (More)

We point out a close relation between a family of Gödel-type solutions of 3+1 General Relativity and the Landau problem in S2,R2 and H2; in particular, the classical geodesics correspond to Larmor orbits in the Landau problem. We discuss the extent of this relation, by analyzing the solutions of the Klein-Gordon equation in these backgrounds. Guided by the… (More)

We analyze SU(2) invariant half-BPS states of the 3d, N = 8 or N = 6 SCFT within the radial quantization of the ABJM theory [1], the theory proposed to describe N M2-branes in the R × C/Zk background. After studying the classical moduli space of these configurations, we explicitly construct a set of gauge invariant operators involving ’t Hooft monopole… (More)