Asymptotically Euclidean Solutions of the Constraint Equations with Prescribed Asymptotics

TL;DR

This paper develops a method to construct asymptotically flat vacuum initial data in General Relativity with prescribed asymptotic properties, and provides a numerical example showing novel asymptotic behavior without antipodal symmetry.

Contribution

It introduces a way to specify detailed asymptotic structures in initial data sets and demonstrates this with a new numerical example exhibiting stronger asymptotics.

Findings

Constructed initial data with desired asymptotics

Numerical example with stronger asymptotics than previous work

Initial data evolution lacks antipodal symmetry

Abstract

We demonstrate that in constructing asymptotically flat vacuum initial data sets in General Relativity via the conformal method, certain asymptotic structures may be prescribed a priori through the specified seed data, including the ADM momentum components, the leading- and next-to-leading-order decay rates, and the anisotropy in the metric's mass term, yielding a recipe to construct initial data sets with desired asymptotics. We numerically construct a simple explicit example of an initial data set, with stronger asymptotics than have been obtained in previous work, such that the evolution of this initial data set does not exhibit the conjectured antipodal symmetry between future and past null infinity.