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arXiv 1609.06925gr-qc
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广义相对论自由发展方程的初边值问题

The initial boundary value problem for free-evolution formulations of General Relativity

David Hilditch, Milton Ruiz

摘要:

我们考虑耦合到一个参数化的家庭的坐标条件,其中包括移动穿刺和谐波规范的广义相对论的自由发展配方的初始边值问题。我们主要集中在边界,是几何确定的最外层正常观察员类空切片的叶理。我们提出了规范、约束违反和引力波自由度的高阶导数边界条件。二阶导数边界条件的数值相对论模拟中使用的保角变量。利用Kreiss-Agranovich-Metivier理论,我们证明了在冻结系数近似下,只要有足够高的阶导数边界条件,初边值问题就可以是边界稳定的。所需导数的精确数目取决于规范。对于一个选择的规范条件,使系统强双曲的常重数,适定性的初始边值问题如下在此近似。考虑到伪微分算子的理论,预计非线性问题在时间上也是局部适定的。

英文摘要:

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.

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