Squeezing a fixed amount of gravitational energy to arbitrarily small scales, in $U(1)$ symmetry

TL;DR

This paper demonstrates the finite-time existence of solutions to vacuum Einstein equations with U(1) symmetry, allowing gravitational energy to be concentrated at arbitrarily small scales through innovative analytical techniques.

Contribution

It introduces a novel approach to analyze Einstein equations in a null geodesic gauge with parabolic scaling, enabling control of energy concentration at small scales.

Findings

Finite-time existence of solutions with concentrated energy

Construction of solutions with energy along geodesics

Development of new analytical tools for Einstein equations

Abstract

We prove uniform finite-time existence of solutions to the vacuum Einstein equations in polarized U(1) symmetry which have uniformly positive incoming $H^1$ energy supported on an arbitrarily small set in the 2 + 1 spacetime obtained by quotienting by the U(1) symmetry. We also construct a subclass of solutions for which the energy remains concentrated (along a U(1) family of geodesics) throughout its evolution. These results rely on three innovations: a direct treatment of the 2 + 1 Einstein equations in a null geodesic gauge, a novel parabolic scaling of the Einstein equations in this gauge, and a new Klainerman-Sobolev inequality on rectangular strips.