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arXiv 2004.00003gr-qc
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Einstein-scalar-Gauss-Bonnet引力的$d+1$形式

$d+1$ formalism in Einstein-scalar-Gauss-Bonnet gravity

Félix-Louis Julié, Emanuele Berti

摘要:

我们提出了爱因斯坦-标量-高斯-博内(ESGB)理论的$d+1$公式在维度$D=d+1$和任意(类空或类时)切片。我们首先建立了一个行动,概括了吉布斯-霍金-约克和迈尔斯ESGB理论,表明它们可以描述的狄利克雷变分原理。然后,我们推广的Arnowitt-Deser-Misner(ADM)拉格朗日和哈密顿ESGB理论,以及由此产生的$d+1$分解的运动方程。与广义相对论不同,ESGB理论的正则动量在外曲率上是非线性的。这有两个主要的含义:(i)ADM哈密顿量一般是多值的,并且相关的哈密顿量演化是不可预测的;(ii)“$d+1$“运动方程是准线性的,并且它们可能在强烈弯曲的、高度动态的区域中破裂。我们的结果将有助于指导未来的ESGB引力在非微扰区域的数值相对论的发展。

英文摘要:

We present the $d+1$ formulation of Einstein-scalar-Gauss-Bonnet (ESGB) theories in dimension $D=d+1$ and for arbitrary (spacelike or timelike) slicings. We first build an action which generalizes those of Gibbons-Hawking-York and Myers to ESGB theories, showing that they can be described by a Dirichlet variational principle. We then generalize the Arnowitt-Deser-Misner (ADM) Lagrangian and Hamiltonian to ESGB theories, as well as the resulting $d+1$ decomposition of the equations of motion. Unlike general relativity, the canonical momenta of ESGB theories are nonlinear in the extrinsic curvature. This has two main implications: (i) the ADM Hamiltonian is generically multivalued, and the associated Hamiltonian evolution is not predictable; (ii) the "$d+1$" equations of motion are quasilinear, and they may break down in strongly curved, highly dynamical regimes. Our results should be useful to guide future developments of numerical relativity for ESGB gravity in the nonperturbative regime.

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