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The recently discovered resonant drag instability of dust settling/streaming in protoplanetary disc is considered as the mode coupling of subsonic gas-dust mix- ture perturbations. This mode coupling is coalescence of two modes with nearly equal phase velocities: the first mode is inertial wave having positive energy, while the second mode is a settling/streaming dust wave (SDW) having negative energy as measured in the frame of gas environment being at rest in vertical hydrostatic equilibrium. SDW is a trivial mode produced by the bulk settling of dust, which transports perturbations of dust density.
№ | Имя | Описание | Имя файла | Размер | Добавлен |
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1. | Презентация | pres.pdf | 1,7 МБ | 16 июля 2019 [zhuravlev] |