Volume 119, Number 2, July 2017
|Number of page(s)||6|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||05 October 2017|
Pulsational mode behaviour in complex non-extensive non-thermal viscous astrophysical fluids
Department of Physics, Tezpur University - Napaam-784028, Tezpur, Assam, India
Received: 16 June 2017
Accepted: 12 September 2017
A semi-analytic evolutionary model is classically constructed to see the pulsational mode dynamics of gravitational collapse in a hydrostatically bounded complex non-thermal astrocloud on the Jeans scales of space and time. The multi-fluidic model consists of non-extensive electrons and ions, and massive dust grains along with partial ionization in flat space-time. A linear Fourier-based normal mode analysis around the defined static (homogeneous) equilibrium reduces the basic cloud equations into a quartic (biquadratic) dispersion relation with a unique set of multi-parametric coefficients. It is interestingly found that non-thermal associations in the cloud pave the way for faster normal mode propagation. The neutral dust viscosity plays a decisive role towards a transition of the pulsational mode from a non-dispersive to a dispersive form. It is also observed that the viscosity has a stabilizing influence on the cloud. The dust-charge variation is noted to play an insignificant role on the stability. The results may be significant in understanding the dynamic non-homological cloud collapse leading to a hierarchical initiation of a bounded structure formation in diverse astro-cosmic anti-equilibrium environs.
PACS: 52.27.Lw – Dusty or complex plasmas; plasma crystals / 04.40.-b – Self-gravitating systems; continuous media and classical fields in curved spacetime / 95.30.Lz – Hydrodynamics
© EPLA, 2017
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.