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arXiv 1707.03577astro-ph.EPnlin.CD
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小行星对行星群的长期影响和太阳系的混沌动力学

Long-term influence of asteroids on planet longitudes and chaotic dynamics of the solar system

Freddy Bouchet, E Woillez

摘要:

本文的目的是比较不同来源的随机性在太阳系。更准确地说,我们研究的重要性,长期影响的小行星的混沌动力学的太阳系。我们表明,小行星对行星的影响是类似于一个白噪声过程,当这些影响被认为是在一个时间尺度上远远大于相关时间$τ_φ\simeq10^{4}$年的小行星轨迹。我们计算的时间尺度$τ_{e}$后,小行星的随机演化的影响导致的扰动拉普拉斯\textendash拉格朗日长期动力学的初始条件的信息丢失。这个时间尺度的数量级是由理论论证精确确定的。这个时间尺度应该与没有小行星(内在混沌)的太阳系的李雅普诺夫时间$τ_{i}$进行比较。我们得出结论,$τ_{i}\simeq10\, \text{Myr} \ll τ_{e} \simeq10^{4}\, \text{Myr}$,表明外部来源的混乱出现作为一个小扰动的随机长期行为的太阳系,而不是由于内在的混乱。

英文摘要:

The aim of this paper is to compare different sources of stochasticity in the solar system. More precisely we study the importance of the long term influence of asteroids on the chaotic dynamics of the solar system. We show that the effects of asteroids on planets is similar to a white noise process, when those effects are considered on a time scale much larger than the correlation time $τ_φ\simeq10^{4}$ yr of asteroid trajectories. We compute the time scale $τ_{e}$ after which the effects of the stochastic evolution of the asteroids lead to a loss of information for the initial conditions of the perturbed Laplace\textendash Lagrange secular dynamics. The order of magnitude of this time scale is precisely determined by theoretical argument. This time scale should be compared with the Lyapunov time $τ_{i}$ of the solar system without asteroids (intrinsic chaos). We conclude that $τ_{i}\simeq10\, \text{Myr} \ll τ_{e} \simeq10^{4}\, \text{Myr}$, showing that the external sources of chaoticity arise as a small perturbation in the stochastic secular behavior of the solar system, rather due to intrinsic chaos.

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。

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