Nonlocal and collective relaxation in stellar systems
Nonlocal and collective relaxation in stellar systems
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DOI：
10.1086/172773
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发表时间：
1993-06
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影响因子：
--
通讯作者：
M. Weinberg
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文献类型：
--
作者：
M. Weinberg
本文采用解析理论和n体模拟相结合的方法，研究了恒星系统对大尺度涨落的模态响应。随着系统尺寸接近其Jeans长度，大尺度低阶模式的最大振幅急剧增加，使弛豫增强10-100倍。然而，我们发现，这些模式的随机激发显着增加的松弛速率，即使是一个系统适度远离不稳定。大尺度涨落的影响在n体模拟中是明显的，这是为了抑制小尺度上的弛豫而设计的
Using both analytic theory and n-body simulation, this paper considers the modal response of stellar systems to fluctuations at large scales. As the system size approaches its Jeans length, the maximum amplitude of the large-scale low-order modes dramatically increases, enhancing the relaxation by factors of 10-100. However, we show that the stochastic excitation of these modes significantly increases the relaxation rate even for a system moderately far from instability. The effects of large-scale fluctuations are apparent in n-body simulations which are designed to suppress relaxation at small scales