Prof. Pralay Kumar Karmakar
Department of Physics, Tezpur University, Napaam-784028, Tezpur, Assam, India
Title: Stability analysis of complex magnetized astroclouds with extreme dust-fugacity moderation effects
Abstract:
This talk organizationally describes the atypical model stability behaviours of the Dust-Acoustic Wave (DAW) and the Dust-Coulomb Wave (DCW) in self-gravitating magnetized viscoelastic spherical dusty astroclouds on the relevant astrophysical fluid scales of space and time. It is orderly in the extreme dust-fugacity regimes of low and high strengths. The spatiotemporal scales are so considered as to be quite suitable to see the physical mechanisms for triggering the initiation processes leading to bounded structure formation via the non-local gravito-electrostatic coupling mechanics. The basic model setup consists of constitutive inertial charge-fluctuating dust grains alongside non-thermal electrons and non-thermal ions in a generalized hydrodynamic framework. A normal spherical wave analysis over the perturbed cloud structuring equations yields a unique generalized quadratic dispersion relation with an atypical set of plasma-dependent multi-parametric dispersion coefficients. A constructive numerical platform shows that the triggered fluctuations are free from the viscoelasticity effects in the weakly coupled limit (WCL) against that in the strongly coupled limit (SCL). It is further found that the electron concentration, dust charge, and magnetic field play as stabilizing and accelerating agencies to the linear fluctuations. The ion concentration and non-thermality parameter show destabilizing and decelerating effects. The cloud dimension illustrates a unique stabilizing feature in the ultra-low frequency domain. Both the DAW and DCW are dispersive in the short-wavelength (acoustic) regime and non-dispersive in the long-wavelength (gravitational) regime. The distinctive WCL-SCL scenarios are demonstratively discussed. The investigated outcomes establish correlative consistencies in panoptic light of the real astronomic circumstances towards bounded astrostructure creation and active progression.
Biography:
Pralay
Kumar Karmakar completed his PhD from Centre of Plasma Physics – Institute for
Plasma Research (CPP-IPR), Guwahati, Assam, India. The award was conferred to
him by Gauhati University, India. He joined Tezpur University as Assistant
Professor in the Department of Physics, Tezpur University, Tezpur, Assam,
India. He is interested in diversified research areas, such as Astrophysical
plasmas, Cosmic fluid dynamic, Stability analysics of complex media, Nonlinear
dynamics, etc. Six scholars have earned PhD under his academic supervision. He
has very good publications in reputed journals, books, etc. He has been serving
as an editorial board member in several high-rated international scientific
journals of repute for years.
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