论文标题
用CSST星系聚类光谱调查来限制Brans-Dicke宇宙学
Constraining Brans-Dicke cosmology with the CSST galaxy clustering spectroscopic survey
论文作者
论文摘要
Brans-Dicke（BD）理论是最简单的重力标量理论，可以被视为修改后的爱因斯坦的一般相对论理论的候选者。在这项工作中，我们在CSST Galaxy聚类光谱调查中预测了BD理论的约束，其幅度限制$ \ sim 23 $ ab mag for Point-Source 5 $σ$检测。我们基于ZCOSMOS目录生成模拟数据，并考虑CSST光谱调查的观察性和工具效应。我们在BD理论中鉴定了Galaxy功率谱从$ z = 0 $到1.5，并且还包括星系偏置和其他系统参数。马尔可夫链蒙特卡洛（MCMC）技术用于找到宇宙学和系统参数的最佳和概率分布。引入了Brans-Dicke参数$ζ$，满足$ζ= \ ln \ left（1+ \ frac {1}ω\ right）$。我们发现，CSST光谱星系聚类调查可以给出$ |ζ| <10^{ - 2} $，或等效地$ | |ω|> \ Mathcal {o}（10^2）$和$ | \ dot {g}/g}/g | <10^{ - <10^{ - 13} $，在假设$ζ$下。与使用当前的宇宙微波背景（CMB），Baryon声学振荡（BAO）和IA型Supernova（SN IA）数据相比，这些约束几乎具有相同的数量级数量级，表明CSST Galaxy Crasting Spection sublice and baryon声学振荡（BAO）和类型IA型超新星（SN IA），表明CSST Galaxy Crasting Spection sumplosing compustroscic Survey将可以限制BD理论和其他修饰理论。
The Brans-Dicke (BD) theory is the simplest Scalar-Tensor theory of gravity, which can be considered as a candidate of modified Einstein's theory of general relativity. In this work, we forecast the constraints on BD theory in the CSST galaxy clustering spectroscopic survey with a magnitude limit $\sim 23$ AB mag for point-source 5$σ$ detection. We generate mock data based on the zCOSMOS catalog and consider the observational and instrumental effects of the CSST spectroscopic survey. We predicate galaxy power spectra in the BD theory from $z=0$ to 1.5, and the galaxy bias and other systematical parameters are also included. The Markov Chain Monte Carlo (MCMC) technique is employed to find the best-fits and probability distributions of the cosmological and systematical parameters. A Brans-Dicke parameter $ζ$ is introduced, which satisfies $ζ=\ln \left(1+\frac{1}ω\right)$. We find that the CSST spectroscopic galaxy clustering survey can give $|ζ|<10^{-2}$, or equivalently $|ω|>\mathcal{O}(10^2)$ and $|\dot{G}/G|<10^{-13}$, under the assumption $ζ= 0$. These constraints are almost at the same order of magnitude compared to the joint constraints using the current cosmic microwave background (CMB), baryon acoustic oscillations (BAO), and Type Ia supernova (SN Ia) data, indicating that the CSST galaxy clustering spectroscopic survey would be powerful to constrain the BD theory and other modified gravity theories.
