Kinetic theory of Jeans’ gravitational instability in millicharged dark matter system

Chen, Hui; Yang, Wei-Heng; Xiong, Yu-Zhen; Liu, Sanqiu

doi:10.1088/1674-1056/ac5239

Cited by 4 publications

(2 citation statements)

References 46 publications

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“…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%

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

Shu,

Zhang,

et al. 2023

Phys. Scr.

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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.

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Section: Introductionmentioning

confidence: 99%

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

Shu,

Zhang,

et al. 2023

Phys. Scr.

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“…It is worth noting that the properties of gravitational systems are similar to the plasma system, i.e., their interaction forces are inversely proportional to the square of the distance. So, the methodology used to describe wave-wave and wave-particle interactions in plasma is also valid for self-gravitation systems [13][14][15][16]. That is, we can consider self-gravitation systems as a special kind of plasma system.…”

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confidence: 99%

The instability analysis of self-gravitation systems under the perturbation with orbital angular momentum

Yang

Tan

Chen³

et al. 2023

Commun. Theor. Phys.

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Based on plasma kinetic theory, the instabilities of self-gravitation systems under the perturbation with orbital angular momentum (OAM) are investigated, and the concept of twisted Jeans mode is introduced to describe the new phenomenon. The result shows that the growth rate of Jeans instability is enhanced with the OAM parameter increased, while the critical wave number is consistent with the classical Jeans critical value. It was expected that the present results would give more insight into the evolution and dynamics of self-gravitational system.

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