Prof.  Pralay Kumar  Karmakar
Tezpur University,  India

Title: ACOUSTIC MODE STABILITY IN ASTROPHYSICAL QUANTUM PLASMAS

Abstract:

The main objective of this methodical presentation is to highpoint a theoretic model formalism, methodologically built up to explore the normal stability behavioural dynamics of the nucleus-acoustic waves (NAWs), excitable in astrophysical gyrogravitating degenerate quantum plasma fluids, as in diverse complex compact astroobjects of white dwarf family. It consists of classically treated non-degenerate light nuclear species, heavy nuclear species; and quantum-mechanically treated degenerate lighter electronic species. The hydrodynamic model closure completes via the non-local long-range gravito-electrostatic interaction processes [1-2]. The vital incitements of the linear correlative viscoelasticity and nonlinear electrostatic confinement pressure are conjointly included. Application of a standard normal spherical mode analysis yields a generalized linear dispersion relation (septic in polynomial degree). It depicts the nucleus-originated NAW multiparametric dependency on the plasma features with no quasi-classic approximation against the customary tradition of stability analyses [3-5]. It is demonstrated herein that the relative nuclear charge-mass coupling parameter acts as a destabilizing factor. The ratio of the charge density of heavy-to-light nuclear species plays as a stabilizing agent in both the non-relativistic (NR) and ultra-relativistic (UR) regimes. In both the NR-UR domains, the rotational force introduces a destabilizing influence on the NAW system. A comparative analysis overview of the findings is presented and interpreted in light of the different astronomic predictions reported in the literature extensively [1-2]. We lastly reinforce the exploration to indicate the asteroseismic applicability of our explorative analyses. It essentially aims at the insightful physics of diverse wave-instability characteristic behaviours in complex compact quantum plasmas, mirroring predominantly the core interiors of diverse compact white dwarfs and comparable astrostructures in both the realistic NR [1-3] and UR [4-6] regimes. Newfangled refinements and future directions with more realistic forms of the degenerate electronic dynamics [1-2] to be appropriately integrated here in the quantum-mechanical fabric are decisively stated.

References

[1] G. Manfredi, Field Inst. Commun. Ser. 46, 263 (2005).

[2] D. Koester, Astron. Astrophys. Rev. 11, 33 (2002).

[3] S. Dasgupta, P. K. Karmakar, Sci. Rep. 11, 19126 (2021).

[4] S. Dasgupta and P. K. Karmakar, Chinese J. Phys. 76, 299 (2022).

[5] S. Dasgupta and P. K. Karmakar, J. Astrophys. Astron. 43, 60 (2022).

[6] S. Dasgupta, A. Atteya, and P. K. Karmakar, Chinese J. Phys. 89, 539 (2023).

Biography:

Dr. Pralay Kumar Karmakar, Professor, Department of Physics, Tezpur University (India), has completed his PhD from Centre of Plasma Physics – Institute for Plasma Research (CPP-IPR), Guwahati, India, under Gauhati University, Assam, India. He has joined Tezpur University as Assistant Professor in the Department of Physics, Tezpur University, Tezpur, India. He has, since then, been widely interested in diversified research and teaching areas, such as Astrophysical plasmas, Cosmic fluid dynamics, Stability analyses of complex media, Nonlinear wave dynamics, Structure formation, Plasma-wall interaction, Gravito-electrostatic sheath, Physics of complex plasmas, Nonlinear plasma theory, Advanced electrodynamics, and so forth. He has successfully completed several awarded research projects, sponsored by Government of India, such as DST, SERB, UGC, etc. He is in the editorial and review board of a number of prestigious international refereed journals. A noteworthy number of active reviewer certificates of honour have been awarded to him. He has good impactful publications in reputed peer-reviewed journals (# 119), book chapters (# 16), proceedings (# 29), etc. He has acted as an invited speaker, keynote speaker, and plenary speaker in a reasonable number of scientific programs both in India and abroad. He has guided a sensibly good number of Research Scholars for PhD, Project Students for Masters, and Interns for Bachelors. He has recently received an award of IUCAA Associateship for executing supported research works in Astronomy in the duration of 2023-26. He is actively associated with several national and international scientific societies of high repute towards promoting science, technology, and academic growth for the mankind globally.