Can modified gravity models reconcile the tension between the CMB anisotropy and lensing maps in Planck-like observations?

被引：25

作者：

Hu, Bin ^{[1
]}

Raveri, Marco ^{[2
,3
]}

机构：

[1] Leiden Univ, Inst Lorentz, NL-2300 RA Leiden, Netherlands

[2] SISSA Int Sch Adv Studies, I-34136 Trieste, Italy

[3] Ist Nazl Fis Nucl, Sez Trieste, I-34127 Trieste, Italy

来源：

PHYSICAL REVIEW D | 2015年 / 91卷 / 12期

关键词：

CFHTLENS;

D O I：

10.1103/PhysRevD.91.123515

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Planck-2015 data seem to favor a large value of the lensing amplitude parameter, A(L) = 1.22 +/- 0.10, in CMB spectra. This result is in 2 sigma tension with the lensing reconstruction result, A(L)(phi phi) = 0.95 +/- 0.04. In this paper, we simulate several CMB anisotropy and CMB lensing spectra based on Planck-2015 best-fit cosmological parameter values and Planck bluebook beam and noise specifications. We analyze several modified gravity models within the effective field theory framework against these simulations and find that models whose effective Newton constant is enhanced can modulate the CMB anisotropy spectra in a way similar to that of the AL parameter. However, in order to lens the CMB anisotropies sufficiently, like in the Planck-2015 results, the growth of matter perturbations is substantially enhanced and gives a high sigma(8) value. This in turn proves to be problematic when combining CMB anisotropy data from Planck with other data, such as weak lensing from CFHTLenS which favor a smaller amplitude of matter fluctuations.

引用

页数：7

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