Scaling behavior in a stochastic self-gravitating system

Details Scaling behavior in a stochastic self-gravitating system Scaling behavior in a stochastic self-gravitating system

2003-08-21

arxiv.org/abs/astro-ph/0308369v1

Phys.Rev.Lett.92:161101,2004

Astronomy and Astrophysics

Astrophysics

6 pages, REVTEX3 source, 1 PS figure

Scientific paper

10.1103/PhysRevLett.92.161101

A system of stochastic differential equations for the velocity and density of a classical self-gravitating matter is investigated by means of the field theoretic renormalization group. The existence of two types of large-scale scaling behavior, associated to physically admissible fixed points of the renormalization-group equations, is established. Their regions of stability are identified and the corresponding scaling dimensions are calculated in the one-loop approximation (first order of the epsilon expansion). The velocity and density fields have independent scaling dimensions. Our analysis supports the importance of the rotational (nonpotential) components of the velocity field in the formation of those scaling laws.

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