Correlations of cosmic tidal fields

被引:42
作者
Catelan, P
Porciani, C
机构
[1] CALTECH, Pasadena, CA 91125 USA
[2] Univ Cambridge, Inst Astron, Cambridge CB3 0HA, England
关键词
galaxies : statistics; cosmology : theory; large-scale structure of Universe;
D O I
10.1046/j.1365-8711.2001.04250.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We study correlations amongst tidal fields originated by the large-scale distribution of matter in the Universe. The two-point tidal correlation is described as a rank-4 tensor, the elements of which can be written in terms of four fundamental scalar functions ranging, with respect to the spatial separation, from purely transversal to purely longitudinal correlations. Tidal fields, on both galaxy and cluster scales, are revealed to be correlated over distances larger than the mass-density correlation length, although traceless tidal fields show anticorrelation between diagonal terms along orthogonal directions. The cross-correlation between mass and tidal field is also analysed. These results are relevant for galaxy formation and the interpretation of large-scale weak lensing phenomena.
引用
收藏
页码:713 / 717
页数:5
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