引力不稳定吸积盘中作为向螺旋结构转变的驻定孤波
Standing solitary waves as transitions to spiral structures in gravitationally unstable accretion disks
摘要：
足够冷和密度的天体物理盘由于盘的重力而线性不稳定，形成轴对称环。在实践中，形成螺旋结构，这又可能产生结合的片段。我们研究了一个非线性动力学路径，可以解释的发展螺旋在一个本地模型的气体磁盘上的引力不稳定性分叉的亚临界侧。轴对称平衡可以是径向周期性的，也可以是局部的，以孤立驻波的形式存在。孤立子解的能量略大于光滑圆盘。他们是进一步不稳定的非轴对称扰动与广泛的方位波数。孤立波可以作为螺旋和碎裂的途径。
英文摘要：
Astrophysical disks that are sufficiently cold and dense are linearly unstable to the formation of axisymmetric rings as a result of the disk's gravity. In practice, spiral structures are formed, which may in turn produce bound fragments. We study a nonlinear dynamical path that can explain the development of spirals in a local model of a gaseous disk on the subcritical side of the gravitational instability bifurcation. Axisymmetric equilibria can be radially periodic or localized, in the form of standing solitary waves. The solitary solutions have an energy slightly larger than a smooth disk. They are further unstable to non-axisymmetric perturbations with a wide range of azimuthal wavenumbers. The solitary waves may act as a pathway to spirals and fragmentation.
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