The Prescribed Metric on Convex Subsets of Anti-de Sitter Space with Quasi-Circle Ideal Boundaries

TL;DR

This paper constructs a globally hyperbolic convex region in 3D anti-de Sitter space with prescribed boundary metrics and a boundary map that is quasi-symmetric, linking boundary conformal structures with the bulk geometry.

Contribution

It establishes the existence of convex subsets in anti-de Sitter space with prescribed boundary metrics and boundary maps, extending the understanding of geometric structures with quasi-symmetric boundary conditions.

Findings

Existence of convex regions with specified boundary metrics.

Construction of gluing maps equal to given quasi-symmetric maps.

Connection between boundary conformal structures and bulk geometry.

Abstract

Let $h^{+}$ and $h^{-}$ be two complete, conformal metrics on the disc $\mathbb{D}$. Assume moreover that the derivatives of the conformal factors of the metrics $h^{+}$ and $h^{-}$ are bounded at any order with respect to the hyperbolic metric, and that the metrics have curvatures in the interval $\left(-\frac{1}{\epsilon}, -1 - \epsilon\right)$, for some $\epsilon > 0$. Let $f$ be a quasi-symmetric map. We show the existence of a globally hyperbolic convex subset $\Omega$ (see Definition 4.1) of the three-dimensional anti-de Sitter space, such that $\Omega$ has $h^{+}$ (respectively $h^{-}$) as the induced metric on its future boundary (respectively on its past boundary) and has a gluing map $\Phi_{\Omega}$ (see Definition 5.7) equal to $f$.