Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-13
Phys.Rev. D73 (2006) 024024
Astronomy and Astrophysics
Astrophysics
11 pages, 5 figures; accepted for publication in Phys.Rev.D
Scientific paper
10.1103/PhysRevD.73.024024
For the evolution of density fluctuation in nonlinear cosmological dynamics, adhesion approximation (AA) is proposed as a phenomenological model, which is especially useful for describing nonlinear evolution. However, the origin of the artificial viscosity in AA is not clarified. Recently, Buchert and Dom\'{\i}nguez report if the velocity dispersion of the dust fluid is regarded as isotropic, it works on a principle similar to viscosity or effective pressure, and they consider isotropic velocity dispersion as the origin of the artificial viscosity in AA. They name their model the Euler-Jeans-Newton (EJN) model. In this paper, we focus on the velocity distribution in AA and the EJN model and examine the time evolution in both models. We find the behavior of AA differs from that of the EJN model, i.e., although the peculiar velocity in the EJN model oscillates, that in AA is monotonically decelerated due to viscosity without oscillation. Therefore it is hard to regard viscosity in AA as effective pressure in the EJN model.
Sotani Hajime
Tatekawa Takayuki
No associations
LandOfFree
The comparison of velocity distribution between Adhesion approximation and the Euler-Jeans-Newton model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The comparison of velocity distribution between Adhesion approximation and the Euler-Jeans-Newton model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The comparison of velocity distribution between Adhesion approximation and the Euler-Jeans-Newton model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-451892