1112.0503 (A. Faltenbacher et al.)

Anisotropy in the matter distribution beyond the BAO scale    [PDF]

A. Faltenbacher, Cheng Li, Jie Wang

Based on a set of 50, large volume, cold dark matter N-Body simulations we compute the alignment correlation functions, i.e.,cross correlation functions between high density peaks and the overall matter distribution measured along the orientation of the peaks and perpendicular to it. We find that matter is distributed anisotropically out to scales of ~150 Mpc/h. At the Baryonic Acoustic Oscillations (BAO) scale, ~100 Mpc/h, the amplitudes of the alignment correlation function measured along the orientation of the high density peaks is enhanced by a factor of ~2 compared to the conventional correlation function. The opposite holds for the correlation measured perpendicular to it. The location of the BAO peak shifts towards smaller (larger) scales if measured along (perpendicular to) the orientation of the high density peaks. There appears no zero-crossing of the correlation functions measured along the orientation of the peaks out to 200 Mpc/h whereas the zero-crossing of the correlation functions measured perpendicular to it is found at distances lower than expected within the LCDM paradigm.

View original: http://arxiv.org/abs/1112.0503