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Isometric embeddings of 2-spheres by embedding flow for applications in numerical relativity

机译:嵌入流的二维球体的等距嵌入,用于数值相对论

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We present a numerical method for solving Weyls embedding problem which consists in finding a global isometric embedding of a positively curved and positive-definite spherical 2-metric into the Euclidean 3-space. The method is based on a construction introduced by Weingarten and was used in Nirenbergs proof of Weyls conjecture. The target embedding results as the endpoint of an embedding flow in R ~3 beginning at the unit spheres embedding. We employ spectral methods to handle functions on the surface and to solve various (non)linear elliptic PDEs. The code requires no additional input or steering from the operator and its convergence is guaranteed by the Nirenberg arguments. Possible applications in 3 + 1 numerical relativity range from quasi-local mass and momentum measures to coarse-graining in inhomogeneous cosmological models.
机译:我们提出了一种解决Weyls嵌入问题的数值方法,该方法包括找到正弯曲和正定球面2度量到欧几里得3空间的全局等距嵌入。该方法基于Weingarten提出的构造,并用于Nirenbergs的Weyls猜想证明中。目标嵌入的结果是在R〜3中从单位球嵌入开始的嵌入流的终结点。我们采用频谱方法来处理表面上的函数并求解各种(非线性)椭圆形PDE。该代码不需要操作员的额外输入或控制,并且Nirenberg参数可确保其收敛。在3 + 1数值相对论中的可能应用范围从准局部质量和动量测度到不均匀宇宙学模型中的粗粒度。

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