Jeans analysis in modified gravity

被引：44
作者：
Roshan, Mahmood [1 ]
Abbassi, Shahram [1 ,2 ,3 ]
机构：
[1] Ferdowsi Univ Mashhad, Dept Phys, Mashhad, Iran
[2] Inst Res Fundamental Sci IPM, Sch Astron, Tehran, Iran
[3] Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
来源：
PHYSICAL REVIEW D | 2014年 / 90卷 / 04期
关键词：
D O I：
10.1103/PhysRevD.90.044010
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
MOdified Gravity (MOG) is a covariant modification of Einstein's general relativity. This theory is one of the current alternatives to dark matter models. We describe the dynamics of collisionless self-gravitating systems in the context of MOG. By studying the weak field approximation of this theory, we derive the equations governing the dynamics of the self-gravitating systems. More specifically, we consider the Jeans instability for self-gravitating fluid and stellar systems and derive new Jeans mass limit (M) over tilde (J) and wave-number (k) over tilde (J). Furthermore, considering the gravitational instability in star-forming regions, we show that MOG has not a significant difference with general relativity on this astrophysical scale. However, at larger scales, such as intergalactic space, MOG may lead to different galaxy- and structure-formation processes.
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页数：12
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