Charged dilatonic spacetimes in string theory

We construct and study general static, spherically symmetric, magnetically charged solutions in Einstein-Maxwell-dilaton gravity in four dimensions. That is, taking Einstein gravity coupled to a U(1) gauge field and a massless dilaton - e.g., the action in the low-energy limit of string theory or Kaluza-Klein reduction - with arbitrary dilaton coupling, we build a three-parameter family of objects characterized by their mass, charge, and dilaton flux, generalizing the well known Garfinkle-Horowitz-Strominger black hole. We analyze the near-extremal and near-horizon behavior in detail, finding new warped geometries. In a particular limit, where the geometry reduces to the recently discovered customizable AdS(2) x S-2 of Einstein-Maxwell-dilaton gravity, we compute the static s-wave linearized solutions and characterize the anabasis relating the horizon perturbations to their nonlinear completions within our generalized family of spacetimes.

Automated summary

This study investigates static, spherically symmetric, magnetically charged solutions in four-dimensional Einstein-Maxwell-dilaton gravity. The authors construct a three-parameter family of objects characterized by their mass, charge, and dilaton flux, and analyze their near-extremal and near-horizon behavior, finding new warped geometries. The authors also compute the static s-wave linearized solutions in a particular limit and explore the relation between horizon perturbations and their nonlinear completions in the generalized family of spacetimes.