ADIABATIC INVARIANTS IN STELLAR DYNAMICS .2. GRAVITATIONAL SHOCKING
ADIABATIC INVARIANTS IN STELLAR DYNAMICS .2. GRAVITATIONAL SHOCKING
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恒星动力学中的绝热不变量 .2。
DOI：
10.1086/117162
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
M. Weinberg
中科院分区：
文献类型：
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作者：
M. Weinberg
基于含时微扰理论的引力激波新理论表明，对于一般的恒星动力学系统，由于缓慢变化的扰动引起的能量和角动量的变化不是指数小的。它预测显着的冲击加热缓慢变化的扰动以前被认为是可以忽略不计的绝热准则。该理论扩展了传统上仅用脉冲近似计算的情况，并适用于广泛的一类扰动。该方法被具体应用于星星团的磁盘冲击问题。
A new theory of gravitational shocking based on time-dependent perturbation theory shows that the changes in energy and angular momentum due to a slowly varying disturbance are not exponentially small for stellar dynamical systems in general. It predicts significant shock heating by slowly varying perturbations previously thought to be negligible according to the adiabatic criterion. The theory extends the scenarios traditionally computed only with the impulse approximation and is applicable to a wide class of disturbances. The approach is applied specifically to the problem of disk shocking of star clusters.