Gravitational Instability of Cylindrical Viscoelastic Medium Permeated with Non Uniform Magnetic Field and Rotation

Journal of astrophysics and astronomy

Joginder Singh Dhiman1¹  Rajni Sharma¹ 

[1] Department of Mathematics, Himachal Pradesh University, Summerhill, Shimla 171 005, India.$$

关键词: Jeans criterion;    viscoelastic medium;    non uniform magnetic field;    non uniform rotation;    strongly coupled plasma (SCP);    weakly coupled plasma (WCP).;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

The self-gravitating instability of an infinitely extending axisymmetric cylinder of viscoelastic medium permeated with non uniform magnetic field and rotation is studied for both the strongly coupled plasma (SCP) and weakly coupled plasma (WCP). The non uniform magnetic field and rotation are considered to act along the axial direction of the cylinder. The normal mode method of perturbations is applied to obtain the dispersion relation. The condition for the onset of gravitational instability has been derived from the dispersion relation under both strongly and weakly coupling limits. It is found that the Jeans criterion for gravitational collapse gets modified due to the presence of shear and bulk viscosities for the SCP, however, the magnetic field and rotation whether uniform or non uniform has no effect on the Jeans criterion of an infinitely extending axisymmetric cylinder of a self-gravitating viscoelastic medium.

【 授权许可】

Unknown