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arXiv 1705.03065hep-thgr-qc
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AdS非线性不稳定性:破坏球对称和轴对称

AdS nonlinear instability: breaking spherical and axial symmetries

Oscar J. C. Dias, Jorge E. Santos

摘要:

相当多的努力一直致力于研究反德西特(AdS)在球对称的非线性不稳定性,但很少有人知道这种非线性不稳定性的纯引力部门,球对称性是必然打破。在\cite{Bizon:2011gg}中,这种非线性不稳定性的发生与微扰理论中三阶不可消除的长期共振的存在有关。此外,在\cite{Bizon:2011gg}中还确认某些非常精细调整的初始数据不会崩溃。这样的解决方案,线性化后,对应于个别正常模式的AdS,这可以始终backreacted在微扰理论的所有订单。然而,对\cite{Bizon:2011gg}的分析仅限于球对称。\cite{Bizon:2011gg}的微扰论被推广到\cite{Dias:2011ss}的引力微扰论中,特别是某些时间周期解也被证明存在--这些被称为几何子。然而,在\cite{Dias:2011ss}中,只考虑了某一类扰动,这使得扰动分析大大简化。在这份手稿中,我们提出了详细的系统计算形式主义和详尽的和互补的物理性质的真子和引力AdS不稳定性的分析,没有在我们的同伴信\cite{Dias:2016ewl}。特别是,我们发现,不像在球对称,(单一)重力正常模式的AdS可以backreacted产生非线性的解决方案,只有在非常特殊的情况下。我们还表明,弱湍流微扰理论预测存在的直接和逆级联,并给出证据表明,前者占主导地位,后者为等能量的双模种子。

英文摘要:

Considerable effort has been dedicated to study the nonlinear instability of Anti-de Sitter (AdS) within spherical symmetry, but little is known about this nonlinear instability in the purely gravitational sector, where spherical symmetry is necessarily broken. In \cite{Bizon:2011gg} the onset of such nonlinear instability was associated with the existence of irremovable secular resonances at third order in perturbation theory. Furthermore, it was also conjectured in \cite{Bizon:2011gg} that certain very fine tuned initial data would not collapse. Such solutions, upon linearisation, correspond to individual normal modes of AdS, which can be consistently backreacted to all orders in perturbation theory. However, the analysis of \cite{Bizon:2011gg} was restricted to spherical symmetry. The perturbative arguments of \cite{Bizon:2011gg} were then generalised to gravitational perturbations in \cite{Dias:2011ss}, and in particular certain time-periodic solutions were also conjectured to exist - these were coined geons. However, in \cite{Dias:2011ss}, only a certain class of perturbations was considered, for which the perturbative analysis considerably simplifies. In this manuscript we present details of the systematic computational formalism and an exhaustive and complementary analysis of physical properties of the geons and gravitational AdS instability that were absent in our companion Letter \cite{Dias:2016ewl}. In particular, we find that, unlike in spherical symmetry, a (single) gravitational normal mode of AdS can be backreacted to generate a nonlinear solution only in very exceptional circumstances. We also show that weak turbulent perturbative theory predicts the existence of direct and inverse cascades, and give evidence suggesting that the former dominates the latter for equal energy two-mode seeds.

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