Shift of the baryon acoustic oscillation scale: A simple physical picture

被引:103
作者
Sherwin, Blake D. [1 ]
Zaldarriaga, Matias [2 ]
机构
[1] Princeton Univ, Dept Phys, Princeton, NJ 08544 USA
[2] Inst Adv Study, Sch Nat Sci, Princeton, NJ 08540 USA
来源
PHYSICAL REVIEW D | 2012年 / 85卷 / 10期
关键词
DIGITAL SKY SURVEY; LUMINOUS RED GALAXIES;
D O I
10.1103/PhysRevD.85.103523
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A shift of the baryon acoustic oscillation (BAO) scale to smaller values than predicted by linear theory was observed in simulations. In this paper, we try to provide an intuitive physical understanding of why this shift occurs, explaining in more pedagogical detail earlier perturbation theory calculations. We find that the shift is mainly due to the following physical effect. A measurement of the BAO scale is more sensitive to regions with long-wavelength overdensities than underdensities, because (due to nonlinear growth and bias) these overdense regions contain larger fluctuations and more tracers and hence contribute more to the total correlation function. In overdense regions the BAO scale shrinks because such regions locally behave as positively curved closed universes, and hence a smaller scale than predicted by linear theory is measured in the total correlation function. Other effects which also contribute to the shift are briefly discussed. We provide approximate analytic expressions for the nonlinear shift including a brief discussion of biased tracers and explain why reconstruction should entirely reverse the shift. Our expressions and findings are in agreement with simulation results, and confirm that nonlinear shifts should not be problematic for next-generation BAO measurements.
引用
收藏
页数:9
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