Volume 128, Number 3, November 2019
|Number of page(s)||7|
|Section||Physics of Gases, Plasmas and Electric Discharges|
|Published online||03 January 2020|
Bimodal instability dynamics in nonthermal complex tridust astroclouds towards structure formation
1 Department of Physics, Pranab Jubilee College - Bokajan-782480, Karbi- Anglong, Assam, India
2 Department of Physics, Tezpur University - Napaam-784028, Tezpur, Assam, India
Received: 25 April 2019
Accepted: 11 November 2019
The ultra-low frequency instability that can be excited in a star-forming nonthermal tridust molecular cloud (TMC) is analyzed. The theoretic TMC model is composed of the Cairns-distributed tiny electrons and ions; and bipolar (hetero-polar) massive dust grains alongside partial ionization. The global quasi-neutrality condition is presumed to subsist initially in a homogeneous hydrostatic equilibrium configuration on the Jeans spatiotemporal scales. A procedural normal mode analysis over the perturbed composite vast cloud results in a generalized sextic linear dispersion relation (degree-6) having a unique set of multi-parametric coefficients. It is seen analytically that, in the ultra-low frequency instability regime, the real propagation frequency and the growth rate have explicit nontrivial nonlinear dependences on the Jeans-normalized wave number. A numerical illustrative platform is provided for further depiction and confirmation of the exact nature of the fluctuations alongside stabilizing and destabilizing factors. The Cairns thermo-statistical parameter acts both as a destabilizer in the gravitational domain and stabilizer in the acoustic domain. We conjecture that the neutral dust viscosity, negatively charged dust viscosity, and positively charged dust viscosity stabilize the TMC. The fluctuations get stabilized with an augmentation in the TMC spatial size, and vice versa. The results investigated here go in fair agreement piecewise as diversified special cases reported in the literature. At last, the real astronomical implications and nontrivial applications of the explored results in astrostructures are summarily actualized.
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, 2020
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.