Hyperbolic formulations and numerical relativity: II. Asymptotically constrained systems of Einstein equations

Gen Yoneda, Hisa Aki Shinkai

研究成果: Article

29 引用 (Scopus)

抜粋

We study asymptotically constrained systems for numerical integration of the Einstein equations, which are intended to be robust against perturbative errors for the free evolution of the initial data. First, we examine the previously proposed 'λ system', which introduces artificial flows to constraint surfaces based on the symmetric hyperbolic formulation. We show that this system works as expected for the wave propagation problem in the Maxwell system and in general relativity using Ashtekar's connection formulation. Second, we propose a new mechanism to control the stability, which we call the 'adjusted system'. This is simply obtained by adding constraint terms in the dynamical equations and adjusting their multipliers. We explain why a particular choice of multiplier reduces the numerical errors from non-positive or pure-imaginary eigenvalues of the adjusted constraint propagation equations. This 'adjusted system' is also tested in the Maxwell system and in the Ashtekar system. This mechanism affects more than the system's symmetric hyperbolicity.

元の言語English
ページ(範囲)441-462
ページ数22
ジャーナルClassical and Quantum Gravity
18
発行部数3
DOI
出版物ステータスPublished - 2001 2 7

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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