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arXiv 1001.2302gr-qcastro-ph.HEhep-phhep-th
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D维轴对称时空的数值相对论:形式和代码检验

Numerical relativity for D dimensional axially symmetric space-times: formalism and code tests

Miguel Zilhao, Helvi Witek, Ulrich Sperhake, Vitor Cardoso, Leonardo Gualtieri, Carlos Herdeiro, Andrea Nerozzi

摘要:

爱因斯坦场方程在一般背景下的数值演化有可能回答物理学中的各种重要问题:从规范引力对偶性的应用到TeV引力场景中的黑洞生产建模,精确解的稳定性分析和宇宙审查测试。为了研究这些问题,我们将数值相对论扩展到更广义的时空,通过发展一个框架来研究D \ge 5具有SO(D-2)等距群或D \ge 6具有SO(D-3)等距群的D维真空时空的数值演化。在(D-4)球上进行降维处理,将D维真空Einstein方程改写为一个带源项的3+1维系统,并以Baumgarte,Shapiro,Shibata和Nakamura(BSSN)形式表示.这允许使用现有的3+1维数字代码,具有小的适应性。Brill-Lindquist初始数据是在D维构造的,并给出了将它们匹配到我们的3+1维演化方程的过程。我们已经实现了我们的框架,通过调整LEAN代码,并进行各种非旋转黑洞时空的模拟。具体来说,我们提出了一种改进的移动穿刺规,有利于长期稳定的模拟D=5。我们进一步证明了代码的内部一致性,通过研究收敛性和比较数值与解析结果的情况下测地线切片D= 5,6。

英文摘要:

The numerical evolution of Einstein's field equations in a generic background has the potential to answer a variety of important questions in physics: from applications to the gauge-gravity duality, to modelling black hole production in TeV gravity scenarios, analysis of the stability of exact solutions and tests of Cosmic Censorship. In order to investigate these questions, we extend numerical relativity to more general space-times than those investigated hitherto, by developing a framework to study the numerical evolution of D dimensional vacuum space-times with an SO(D-2) isometry group for D\ge 5, or SO(D-3) for D\ge 6. Performing a dimensional reduction on a (D-4)-sphere, the D dimensional vacuum Einstein equations are rewritten as a 3+1 dimensional system with source terms, and presented in the Baumgarte, Shapiro, Shibata and Nakamura (BSSN) formulation. This allows the use of existing 3+1 dimensional numerical codes with small adaptations. Brill-Lindquist initial data are constructed in D dimensions and a procedure to match them to our 3+1 dimensional evolution equations is given. We have implemented our framework by adapting the LEAN code and perform a variety of simulations of non-spinning black hole space-times. Specifically, we present a modified moving puncture gauge which facilitates long term stable simulations in D=5. We further demonstrate the internal consistency of the code by studying convergence and comparing numerical versus analytic results in the case of geodesic slicing for D=5,6.

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