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Phys. Rev. Lett. 96, 051302 (2006) [4 pages]

Low-Redshift Cosmic Baryon Fluid on Large Scales and She-Leveque Universal Scaling

Ping He,1 Jiren Liu,2 Long-Long Feng,3 Chi-Wang Shu,4 and Li-Zhi Fang5
1Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100080, China
2Center for Astrophysics, University of Science and Technology of China, Hefei 230026, China
3Purple Mountain Observatory, Nanjing 210008, China
4Division of Applied Mathematics, Brown University, Providence, Rhode Island 02912, USA
5Department of Physics, University of Arizona, Tucson, Arizona 85721, USA

Received 2 July 2005; revised 8 November 2005; published 9 February 2006

We investigate the statistical properties of cosmic baryon fluid in the nonlinear regime, which is crucial for understanding the large-scale structure formation of the Universe. With the hydrodynamic simulation sample of the Universe in the cold dark matter model with a cosmological constant, we show that the intermittency of the velocity field of cosmic baryon fluid at redshift z=0 in the scale range from the Jeans length to about 16 h-1 Mpc can be extremely well described by She-Leveque's universal scaling formula. The baryon fluid also possesses the following features: (1) for volume weight statistics, the dissipative structures are dominated by sheets, and (2) the relation between the intensities of fluctuations is hierarchical. These results imply that the evolution of highly evolved cosmic baryon fluid is similar to a fully developed turbulence.

©2006 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.96.051302
DOI: 10.1103/PhysRevLett.96.051302
PACS: 98.65.Dx; 47.27.Gs
  • 98.65.Dx
    Superclusters; large-scale structure of the Universe (including voids, pancakes, great wall, etc.)
  • 47.27.Gs
    Isotropic turbulence; homogeneous turbulence
  • YEAR: 2006
KEYWORDS: dark matter, cosmology, red shift, astrophysical fluid dynamics

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