Formulation Problem in Numerical Relativity

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  • 数値相対論における定式化問題 : 一般相対論における数値シミュレーションを安定化させる指針の探求
  • スウチ ソウタイロン ニ オケル テイシキカ モンダイ イッパン ソウタイロン ニ オケル スウチ シミュレーション オ アンテイカ サセル シシン ノ タンキュウ

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We review recent efforts to re-formulate the Einstein equations for fully relativistic numerical simulations in general relativity. The so-called "numerical relativity" is a promising research field matching with ongoing astrophysical observations such as gravitational wave astronomy. Many trials for longterm stable and accurate simulations of binary compact objects have revealed that mathematically equivalent sets of evolution equations show different numerical stability in free evolution schemes. After reviewing the efforts of the community in the decade, we introduce our idea for understanding all the efforts in a unified way using eigenvalue analysis of the constraint propagation equations. The modifications of (or adjustments to) the evolution equations change the character of constraint propagation, and several particular adjustments using constraints are expected to diminish the constraint-violating modes. We propose several new adjusted evolution equations, and present some numerical demonstrations.

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