Energy estimate for initial data on a characteristic cone

Details Energy estimate for initial data on a characteristic cone Energy estimate for initial data on a characteristic cone

2010-12-02

arxiv.org/abs/1012.0458v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

11 pages. Contribution to the proceedings of the conference "New Developments in Lorentzian Geometry", held in Berlin, Nov 200

Scientific paper

The Einstein equations in wave map gauge are a geometric second order system for a Lorentzian metric. To study existence of solutions of this hyperbolic quasi diagonal system with initial data on a characteristic cone which are not zero in a neighbourhood of the vertex one can appeal to theorems due to Cagnac and Dossa, proved for a scalar wave equation, for initial data in functional spaces relevant for their proofs. It is difficult to check that the initial data that we have constructed as solutions of the Einstein wave-map gauge constraints satisfy the more general of the Cagnac-Dossa hypotheses which uses weighted energy estimates. In this paper we start a new study of energy estimates using on the cone coordinates adapted to its null structure which are precisely the coordinates used to solve the constraints, following work of Rendall who considered the Cauchy problem for Einstein equations with data on two intersecting characteristic surfaces.

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