We study the production cross section of a highly excited string with fixed angular momentum from an ultra-high energy collision of two light strings. We find that the cross section exhibits geometric behavior in a certain region of angularmomentum/impact-parameter space. This geometric behavior is common to the differential cross sections of a black hole production with fixed angular momentum ...

Using gauge/gravity duality, we explore a class of states of two CFTs with a large degree of entanglement, but with very weak local two-sided correlation. These states are constructed by perturbing the thermofield double state with thermal-scale operators that are local at different times. Acting on the dual black hole geometry, these perturbations create an intersecting network of shock waves,...

The bosonic content of string theory in curved background of multidimensional structure with p-branes has a systematic geometrical description as an effective σ-model of gravity in lower dimension (say 3 + 1) with additional interacting dilatonic and p-brane fields. If the target-space is locally symmetric, solutions with intersecting p-branes can be found. Some static solutions are p-brane gen...

Event horizons are generated by null geodesics. They are therefore natural candidates for applying a time development equation of the Raychaudhuri type. But in the present context we focus on the non-smooth regions of horizons and other features that we describe by geometrical construction, a kind of virtual use of the Raychaudhuri equation. We hope that our material is nevertheless of interest...

We simulate the gravitational dynamics of the conifold geometries (resolved and deformed) involved in the description of certain compact spacetimes. As the cycles of the conifold collapse towards a singular geometry we find that a horizon develops, shielding the external spacetime from the curvature singularity of the newly formed black hole. The structure of the black hole is examined for a ra...