Evolution of the Pancaking Effect in a LCDM Cosmology

Details Evolution of the Pancaking Effect in a LCDM Cosmology Evolution of the Pancaking Effect in a LCDM Cosmology

2007-02-25

arxiv.org/abs/astro-ph/0702664v2

Astrophys.J.666:627-635,2007

Astronomy and Astrophysics

Astrophysics

accepted by ApJ, 21 pages, 6 figures, discussion and error analysis improved

Scientific paper

10.1086/520632

We explore the evolution of the large-scale anisotropy in the velocity field caused by the gravitational pancaking effect assuming a LCDM universe. The Millennium Run halo catalogs at four different redshifts, z=0, 0.5, 1 and z=2 are analyzed to find that the pancaking effect starts to intervene the hierarchical structure formation at redshift z=2 when a characteristic pancake scale is around 3 Mpc/h. It is also clearly shown how the degree and scale of the pancaking effect changes with time. An analytic model based on the Zel'dovich approximation is presented to explain quantitatively the evolution of the velocity-pancake alignment. A cosmological implication of our finding and a possibility of detecting a signal in real universe are discussed.

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