They are the stellar evaporation in the tidal field , the stellar evolution during the early evolutionary stage , the tidal shocks due to clusters passing through the bulge and disk , and the dynamical friction 本文考虑的动力学过程有四种,即:恒星蒸发、早期大质量恒星的演化、银河系核球和盘的冲击加热以及动力学磨擦。
Dynamical friction is a term in astrophysics related to loss of momentum and kinetic energy of moving bodies through a gravitational interaction with surrounding matter in space. It is sometimes referred to as gravitational drag, and was first discussed in detail by Subrahmanyan Chandrasekhar in 1943.