太阳附近的李雅普诺夫和扩散时标
Lyapunov and diffusion timescales in the solar neighborhood
摘要：
我们估计的李雅普诺夫时间（特征时间的运动的可预测性）在奎伦的模型中的动态在太阳附近。这些模型考虑到由于银河棒和旋臂的扰动。对于估计的李雅普诺夫时间，基于分界线映射理论的方法被使用。李雅普诺夫时间通常是10个银河年的量级。我们表明，只有在一个狭窄的范围内的问题参数的可能值的银河系混沌是绝热的，通常它是不慢。我们还估计了混沌域中的特征扩散时间。在一些模型中，扩散时间足够小，可以让太阳从银河系内部迁移到现在的位置。此外，由于混沌层内弹道飞行的可能性，混沌混合可能比正常扩散更有效和更快。这证实了Minchev和Famaey迁移概念的动力学可能性。
英文摘要：
We estimate the Lyapunov times (characteristic times of predictability of motion) in Quillen's models for the dynamics in the solar neighborhood. These models take into account perturbations due to the Galactic bar and spiral arms. For estimating the Lyapunov times, an approach based on the separatrix map theory is used. The Lyapunov times turn out to be typically of the order of 10 Galactic years. We show that only in a narrow range of possible values of the problem parameters the Galactic chaos is adiabatic; usually it is not slow. We also estimate the characteristic diffusion times in the chaotic domain. In a number of models, the diffusion times turn out to be small enough to permit migration of the Sun from the inner regions of the Milky Way to its current location. Moreover, due to the possibility of ballistic flights inside the chaotic layer, the chaotic mixing might be even far more effective and quicker than in the case of normal diffusion. This confirms the dynamical possibility of Minchev and Famaey's migration concept.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
