Extending MGCAMB tests of gravity to nonlinear scales

IF 5.3 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Journal of Cosmology and Astroparticle Physics Pub Date : 2024-11-07 DOI:10.1088/1475-7516/2024/11/003
Zhuangfei Wang, Daniela Saadeh, Kazuya Koyama, Levon Pogosian, Benjamin Bose, Lanyang Yi and Gong-Bo Zhao
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Abstract

Modified Growth with CAMB (MGCAMB) is a patch for the Einstein-Boltzmann solver CAMB for cosmological tests of gravity. Until now, MGCAMB was limited to scales well-described by linear perturbation theory. In this work, we extend the framework with a phenomenological model that can capture nonlinear corrections in a broad range of modified gravity theories. The extension employs the publicly available halo model reaction code ReACT, developed for modeling the nonlinear corrections to cosmological observables in extensions of the ΛCDM model. The nonlinear extension makes it possible to use a wider range of data from large scale structure surveys, without applying a linear scale cut. We demonstrate that, with the 3×2pt Dark Energy Survey data, we achieve a stronger constraint on the linear phenomenological functions μ and Σ, after marginalzing over the additional nonlinear parameter p1, compared to the case without the nonlinear extension and using a linear cut. The new version of MGCAMB is now forked with CAMB on GitHub allowing for compatibility with future upgrades.
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将 MGCAMB 引力测试扩展到非线性尺度
修正的 CAMB 生长(MGCAMB)是爱因斯坦-玻尔兹曼求解器 CAMB 的一个补丁,用于宇宙学引力测试。到目前为止,MGCAMB 还局限于线性扰动理论所描述的尺度。在这项工作中,我们用一个现象学模型扩展了这一框架,该模型可以捕捉广泛的修正引力理论中的非线性修正。该扩展采用了公开的光环模型反应代码 ReACT,该代码是为了模拟 ΛCDM 模型扩展中宇宙学观测指标的非线性修正而开发的。非线性扩展使我们有可能在不应用线性尺度切分的情况下使用来自大尺度结构巡天的更广泛数据。我们证明,利用 3×2pt 暗能量勘测数据,在对额外的非线性参数 p1 进行边际分析之后,我们对线性现象学函数 μ 和 Σ 的约束比没有非线性扩展和使用线性切割的情况更强。新版本的 MGCAMB 已与 GitHub 上的 CAMB 一起分叉,以便与未来的升级兼容。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Cosmology and Astroparticle Physics
Journal of Cosmology and Astroparticle Physics 地学天文-天文与天体物理
CiteScore
10.20
自引率
23.40%
发文量
632
审稿时长
1 months
期刊介绍: Journal of Cosmology and Astroparticle Physics (JCAP) encompasses theoretical, observational and experimental areas as well as computation and simulation. The journal covers the latest developments in the theory of all fundamental interactions and their cosmological implications (e.g. M-theory and cosmology, brane cosmology). JCAP''s coverage also includes topics such as formation, dynamics and clustering of galaxies, pre-galactic star formation, x-ray astronomy, radio astronomy, gravitational lensing, active galactic nuclei, intergalactic and interstellar matter.
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