Jeans surface instability of an electron-ion plasma

Rozina, Ch.; Tsintsadze, Levan N.; Цинцадзе, Н. Л.; Ruby, R.

doi:10.1088/1402-4896/ab1cc6

Cited by 5 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…First of all, let us focus on the critical Jeans wave-number when the system collapses. Substitute ω = 0 and α = 1 into equation (12), one can obtain Jeans wave-number ( ) k J bd 2 for self-gravitating systems containing dark matter in ( ) f R gravity, ( )…”

Section: Jeans Mass Limit In Dark-baryonic Matter Systems With κ-Defo...mentioning

confidence: 99%

“…The formation of stars and planets is one of the most basic problems, and also one of the current research hotspots in astrophysics. Jeans analysis is the key to explain the formation and evolution of self-gravitating structures, has become a hot topic in the field of astrophysics [1][2][3][4][5][6][7][8][9], plasma physics [10][11][12][13][14][15][16][17][18][19], and complex fluid community [20][21][22]. Systems where the mutual gravitation exceeds any other external forces are called selfgravitating systems [23], in the self-gravitating system, if its own thermal pressure is insufficient to resist its gravity, the system will become unstable and collapse due to its own gravitation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Gravitational instability of dark-baryonic matter systems in f (R) gravity

Shu,

Zhang,

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

The gravitational instability of dark-baryonic matter systems is investigated by adopting Boltzmann-Vlasov equation in the background of f(R) gravity, the dispersion relation considering the κ-deformed Kaniadakis distribution is derived by exploiting the kinetic theory. The cases of high and low frequency perturbations are analyzed, respectively. In the high-frequency regime, as κ increases, the normalized frequency experiences a corresponding increase. Conversely, in the low-frequency regime, an increase in κ leads to a simultaneous decrease in both the growth rate and the critical wave number. Furthermore, Jeans mass limit of dark-baryonic matter systems in f R gravity with κ-deformed Kaniadakis distribution is studied, it is found that the increase of T eff with the enlargement of κ, which leads to the increase of Jeans mass M *. In additional, the influence of dispersion velocity ratio and density ratio of dark to baryonic matter is investigated, it is indicated that the amplification of the dispersion velocity ratio leads to the decrease of Jeans mass. It is worth emphasizing that the dark-bayonic matter system have a higher limitation of instability in f(R) gravity than that in the classical Newtonian gravity.

show abstract

Section: Jeans Mass Limit In Dark-baryonic Matter Systems With κ-Defo...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gravitational instability of dark-baryonic matter systems in f (R) gravity

Shu,

Zhang,

et al. 2023

Phys. Scr.

View full text Add to dashboard Cite

show abstract

“…Interestingly, most of the work encountered in the literature addresses gravitational collapse as the main cause of contraction of astrophysical objects due to the increased gravity among dense and massive particles, while the mechanism of gravitational collapse due to surface oscillations was only pointed out recently (Rozina et al. 2019; Ruby et al. 2020).…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, we shall adopt the model presented by Rozina et al. (2019), considering the dispersive properties of surface waves on the interface between gravitational radiative plasma and vacuum, on account of the pressure relation (1.3), assuming an incompressible plasma density and variable (inhomogeneous) temperature. As the basis for our study, we shall use an incompressible radiative electron–ion plasma subject to gravitational and magnetic fields in addition to temperature inhomogeneity.…”

Section: Introductionmentioning

confidence: 99%

Surface waves on the inhomogeneous interface between radiative electron–ion plasma and vacuum

et al. 2021

View full text Add to dashboard Cite

The impact of temperature inhomogeneity, surface charge and surface mass densities on the stability analysis of charged surface waves at the interface between dense, incompressible, radiative, self-gravitating magnetized electron–ion plasma and vacuum is investigated. For such an incompressible plasma system, the temperature inhomogeneity is governed by an energy balance equation. Adopting the one-fluid magnetohydrodynamic (MHD) approximation, a general dispersion relation is obtained for capillary surface waves, which takes into account gravitational, radiative and magnetic field effects. The dispersion relation is analysed to obtain the conditions under which the plasma–vacuum interface may become unstable. In the absence of electromagnetic (EM) pressure, astrophysical objects undergo gravitational collapse through Jeans surface oscillations in contrast to the usual central contraction of massive objects due to enhanced gravity. EM radiation does not affect the dispersion relation much, but actually tends to stabilize the Jeans surface instability. In certain particular cases, pure gravitational radiation may propagate on the plasma vacuum interface. The growth rate of radiative dissipative instability is obtained in terms of the wavevector. Our theoretical model of the Jeans surface instability is applicable in astrophysical environments and also in laboratory plasmas.

show abstract

“…By following one fluid magnetohydrodynamic (MHD) model, the gravity SWs were investigated in Tsintsadze et al (2007), to discuss the surface charge instability at the interface of a dusty cloud and vacuum. More recently, gravity SWs at the interface of an incompressible electron–ion plasma and a vacuum were discussed in Rozina et al (2019), to show that both surface charge and surface gravitational oscillations are coupled together to address star formation through the surface Jeans instability. It was determined in these papers that the one fluid MHD approximation does not hold (Tsintsadze 1998) in the presence of a large gradient in surface charge density, especially on the surface between plasma and vacuum due to the fact that the thermal speed of electrons is much larger than that of ions and dust, so electrons are the most favourable candidate to diffuse on the surface, thus disturbing the electrical neutrality of the plasma.…”

Section: Introductionmentioning

confidence: 99%

Gravitating–radiative magnetohydrodynamic surface waves

et al. 2020

View full text Add to dashboard Cite

Radiative-magnetohydrodynamic (RMHD) equations along with a full set of Maxwell's equations are followed to formulate the charged surface waves at the interface of an incompressible, radiative, magnetized dusty plasma and vacuum, while assuming that the characteristic wave frequency is much smaller than the ion gyrofrequency, having an equilibrium background state. It is found that the separation of charges on the surface is followed by thermal motion, which further leads to a negative pressure gradient normal to the surface, hence the plasma–vacuum interface is under tension due to two different types of oppositely directed pressures. The dusty plasma RMHD set of equations admits a linear dispersion relation of surface Jeans instability of an incompressible dusty plasma, which exhibits a strong coupling between the electron surface charge and dust surface mass densities and we conclude that the surface densities of both electrons and dust as well as the dust inertia play major roles in the gravitational collapse of the surface of astrophysical objects such as stars, galaxies etc. Further, the growth rate of radiative surface waves is found to be function of both the temperature inhomogeneity, appearing due to thermal radiation heat flux, as well as the thermal radiation pressure. The present findings of charged surface waves may seek application at the astroscales.

show abstract

Jeans surface instability of an electron-ion plasma

Cited by 5 publications

References 30 publications

Gravitational instability of dark-baryonic matter systems in f (R) gravity

Gravitational instability of dark-baryonic matter systems in f (R) gravity

Surface waves on the inhomogeneous interface between radiative electron–ion plasma and vacuum

Gravitating–radiative magnetohydrodynamic surface waves

Contact Info

Product

Resources

About