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3D weak lensing: Modified theories of gravity

机译：3D弱镜头：改进的重力理论

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摘要

Weak lensing (WL) promises to be a particularly sensitive probe of both the growth of large-scale structure as well as the fundamental relation between matter density perturbations and metric perturbations, thus providing a powerful tool with which we may constrain modified theories of gravity (MG) on cosmological scales. Future deep, wide-field WL surveys will provide an unprecedented opportunity to constrain deviations from General Relativity. Employing a 3D analysis based on the spherical Fourier-Bessel expansion, we investigate the extent to which MG theories will be constrained by a typical 3D WL survey configuration including noise from the intrinsic ellipticity distribution sigma(epsilon). of source galaxies. Here, we focus on two classes of screened theories of gravity: (i) f(R) chameleon models and (ii) environmentally dependent dilaton models. We use one-loop perturbation theory combined with halo models in order to accurately model the evolution of the matter power spectrum with redshift in these theories. Using a chi(2) analysis, we show that for an all-sky spectroscopic survey, the parameter f(R0) can be constrained in the range f(R0) < 5 x 10(-6) (9 x 10(-6)) for n = 1(2) with a 3 sigma confidence level. This can be achieved by using relatively low-order angular harmonics l < 100. Higher-order harmonics l > 100 could provide tighter constraints but are subject to nonlinear effects, such as baryonic feedback, that must be accounted for. We also employ a Principal Component Analysis in order to study the parameter degeneracies in the MG parameters. The confusion from intrinsic ellipticity correlation and modification of the matter power spectrum at a small scale due to feedback mechanisms is briefly discussed.
机译：弱透镜（WL）有望成为大型结构的两个生长以及物质密度扰动和公制扰动之间的基本关系的一个特别敏感的探测器，从而提供了一种强大的工具，使我们可以约束改性重力的理论（ MG）在宇宙尺度。未来深，宽视场WL调查将提供从广义相对论约束偏离了前所未有的机遇。采用基于所述球形傅里叶Bessel展开三维分析，我们调查到MG理论将通过典型的3D WL调查配置从固有椭圆分布西格马（ε）噪声包括被约束的程度。来源星系。在这里，我们专注于两类重力筛选理论组成：（i）F（R）变色龙模型和（ii）依赖于环境的伸缩子模型。我们使用一个回路微扰理论晕模型相结合，才能准确此事功率谱的演变与这些理论模型红移。使用卡（2）的分析，我们表明，对于全天空光谱测量，参数f（R0）可在范围F（R0）被约束<5×10（-6）（9×10（-6 ）），用于与一个3西格玛置信级别n = 1（2）。这可以通过使用相对低的阶谐波角升<100高阶谐波升> 100可以提供更严格的约束，但受非线性效应，如重子反馈，即必须考虑来实现。我们也采用主成分分析，以便研究在MG参数的参数简并。从在一个小规模的物质功率谱的固有椭圆率的相关性和修改由于反馈机制混乱简要讨论。

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  • 来源
    《Physical review, D》 |2016年第10期|共25页
  • 作者

    Pratten Geraint; Munshi Dipak; Valageas Patrick; Brax Philippe;

  • 作者单位

    Univ Sussex Math &

    Phys Sci Falmer 2 Brighton BN1 9QA E Sussex England;

    Univ Sussex Math &

    Phys Sci Falmer 2 Brighton BN1 9QA E Sussex England;

    Univ Paris Saclay CNRS Inst Phys Theor CEA F-91191 Gif Sur Yvette France;

    Univ Paris Saclay CNRS Inst Phys Theor CEA F-91191 Gif Sur Yvette France;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 粒子物理学;场论;
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