Instability analysis of a cylindrical stellar object in Brans–Dicke gravity
- 作者: Sharif M.1, Manzoor R.1
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隶属关系:
- Department of Mathematics
- 期: 卷 122, 编号 5 (2016)
- 页面: 849-858
- 栏目: Nuclei, Particles, Fields, Gravitation, and Astrophysics
- URL: https://journals.rcsi.science/1063-7761/article/view/190217
- DOI: https://doi.org/10.1134/S1063776116040075
- ID: 190217
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详细
This paper investigates instability ranges of a cylindrically symmetric collapsing cosmic filamentary structure in the Brans–Dicke theory of gravity. For this purpose, we use a perturbating approach to the modified field equations as well as dynamic equations and construct a collapse equation. The collapse equation with an adiabatic index (Γ) is used to explore the instability ranges of both isotropic and anisotropic fluid in Newtonian and post-Newtonian approximations. It turns out that the instability ranges depend on the dynamic variables of collapsing filaments. We conclude that the system always remains unstable for 0 < Γ < 1, while Γ > 1 provides instability only in a special case.
作者简介
M. Sharif
Department of Mathematics
编辑信件的主要联系方式.
Email: msharif.math@pu.edu.pk
巴基斯坦, Lahore, 54590
R. Manzoor
Department of Mathematics
Email: msharif.math@pu.edu.pk
巴基斯坦, Lahore, 54782
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