6533b839fe1ef96bd12a6719
RESEARCH PRODUCT
The initial boundary value problem for free-evolution formulations of General Relativity
Milton RuizMilton RuizDavid Hilditchsubject
AstrofísicaPhysicsPhysics and Astronomy (miscellaneous)010308 nuclear & particles physicsGeneral relativityMathematical analysisFOS: Physical sciencesConformal mapGeneral Relativity and Quantum Cosmology (gr-qc)Coordinate conditions01 natural sciencesGeneral Relativity and Quantum CosmologyNonlinear systemNumerical relativityTheory of relativity0103 physical sciencesAstronomiaBoundary value problem010306 general physicsSecond derivativedescription
We consider the initial boundary value problem for free-evolution formulations of general relativity coupled to a parametrized family of coordinate conditions that includes both the moving puncture and harmonic gauges. We concentrate primarily on boundaries that are geometrically determined by the outermost normal observer to spacelike slices of the foliation. We present high-order-derivative boundary conditions for the gauge, constraint violating and gravitational wave degrees of freedom of the formulation. Second order derivative boundary conditions are presented in terms of the conformal variables used in numerical relativity simulations. Using Kreiss-Agranovich-Metivier theory we demonstrate, in the frozen coefficient approximation, that with sufficiently high order derivative boundary conditions the initial boundary value problem can be rendered boundary stable. The precise number of derivatives required depends on the gauge. For a choice of the gauge condition that renders the system strongly hyperbolic of constant multiplicity, well-posedness of the initial boundary value problem follows in this approximation. Taking into account the theory of pseudo-differential operators, it is expected that the nonlinear problem is also well-posed locally in time.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-12-05 |