Cross-correlation tomography: Measuring dark energy evolution with weak lensing

被引：441
|
作者：
Jain, B [1 ]
Taylor, A
机构：
[1] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
[2] Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland
来源：
PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 14期
关键词：
D O I：
10.1103/PhysRevLett.91.141302
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A cross-correlation technique of lensing tomography is developed to probe dark energy in the Universe. The variation of weak shear with redshift around foreground galaxies depends only on the angular distances and is robust to the dominant systematic error in lensing. We estimate the marginalized accuracies that deep lensing surveys with photometric redshifts can provide on the dark energy density Omega(de), the equation of state parameter w, and its evolution w('): sigma(w)similar or equal to0.01f(sky)(-1/2) and sigma(w('))similar or equal to0.03f(sky)(-1/2), where a prior of sigma(Omega(de))=0.03 is assumed in the marginalization.
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页数：4
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