Einstein Equations Under Polarized \({\mathbb{U}}\)(1) Symmetry in an Elliptic Gauge

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Abstract

We prove local existence of solutions to the Einstein–null dust system under polarized \({\mathbb{U}}\)(1) symmetry in an elliptic gauge. Using in particular the previous work of the first author on the constraint equations, we show that one can identify freely prescribable data, solve the constraints equations, and construct a unique local in time solution in an elliptic gauge. Our main motivation for this work, in addition to merely constructing solutions in an elliptic gauge, is to provide a setup for our companion paper in which we study high frequency backreaction for the Einstein equations. In that work, the elliptic gauge we consider here plays a crucial role to handle high frequency terms in the equations. The main technical difficulty in the present paper, in view of the application in our companion paper, is that we need to build a framework consistent with the solution being high frequency, and therefore having large higher order norms. This difficulty is handled by exploiting a reductive structure in the system of equations.

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© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.CNRS, Institut FourierUniversité Grenoble-AlpesGieresFrance
  2. 2.CMLSEcole PolytechniquePalaiseauFrance
  3. 3.Department of MathematicsStanford UniversityStanfordUSA

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