Volume 120, Number 1, October 2017
|Number of page(s)||7|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||29 December 2017|
Instability behaviour of cosmic gravito-coupled correlative complex bi-fluidic admixture
Department of Physics, Tezpur University - Napaam-784028, Tezpur, Assam, India
Received: 5 September 2017
Accepted: 17 November 2017
The gravitational instability of an unbounded infinitely extended composite gravitating cloud system composed of gravito-coupled neutral gaseous fluid (NGF) and dark matter fluid (DMF) is theoretically investigated in a classical framework. It is based on a spatially-flat geometry approximation (1D, sheet-like, boundless) at the backdrop that the radius of curvature of the gravito-confined bi-fluidic-boundary is much larger than all the hydro-characteristic scale lengths of interest. The relevant collective correlative dynamics, via the lowest-order mnemonic viscoelasticity, is mooted. We apply a standard formalism of normal mode analysis to yield a unique brand of generalized quadratic dispersion relation having variable multi-parametric coefficients dependent on the diversified equilibrium properties. It is parametrically seen that the DMF flow speed and the DMF viscoelasticity introduce stabilizing effects against the composite cloud collapse. The instability physiognomies, as specialized extreme corollaries, are in good accord with the previously reported predictions. The analysis may be widely useful to see the gravito-thermally coupled wave dynamics leading to the formation of large-scale hierarchical non-homologous structures in dark-matter–dominated dwarf galaxies.
PACS: 95.35.+d – Dark matter (stellar, interstellar, galactic, and cosmological) / 95.30.Lz – Hydrodynamics / 47.20.Gv – Viscous and viscoelastic instabilities
© EPLA, 2017
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