Nonlinear eigen-mode structures in complex astroclouds

Frontiers of Physics and Plasma Science

Karmakar, P.K.^1 ; Haloi, A.^1

Department of Physics, Tezpur University, Napaam, Tezpur, Assam

784028, India^1

关键词: Analytic modeling;    Evolutionary dynamics;    Natural excitations;    Pseudopotentials;    Self-gravitational;    Shock-like structures;    Strongly nonlinear;    Unique features;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/836/1/012002/pdf
DOI  :  10.1088/1742-6596/836/1/012002

来源: IOP

【 摘 要 】

The evolutionary dynamics of strongly nonlinear waves (of arbitrary amplitude) in an inhomogeneous complex astrophysical viscous cloud is investigated without recourse to any kind of swindle. It consists of warm lighter electrons and ions (Boltzmanian); and cold massive bi-polar dust grains (inertial fluids) alongside vigorous neutral dynamics in quasi-neural hydrodynamic equilibrium. Application of the Sagdeev pseudo-potential method transforms the analytic model into a conjugated pair of intermixed non-integrable energy integral laws. A natural excitation of electrostatic quasi-monotonic compressive dispersive shock-like eigen-modes is numerically demonstrated. In contrast, the self-gravitational waves grow purely as non-monotonic compressive oscillatory shock-like structures. The unique features of both the distinct classes are depicted. Their non-trivial significance in the astro-context is emphasized.