论文标题
使用Galaxy簇III测试重力的一般框架III：可观察的质量缩放关系$ f（r）$重重
A general framework to test gravity using galaxy clusters III: Observable-mass scaling relations in $f(R)$ gravity
论文作者
论文摘要
我们测试了两种方法，其中包括这项工作中新提出的一种方法，用于校正变色龙$ f（r）$重力对星系群质量和四个可观察的代理之间的缩放关系的影响。 Using the first suite of cosmological simulations that simultaneously incorporate both full physics of galaxy formation and Hu-Sawicki $f(R)$ gravity, we find that these rescaling methods work with a very high accuracy for the gas temperature, the Compton $Y$-parameter of the Sunyaev-Zel'dovich (SZ) effect and the X-ray analogue of the $Y$-parameter.这允许$ f（r）$重力中的比例关系映射到其$λ$ cdm的同行。我们确认，Chameleon $ f（r）$重力的动态和真实质量之间的比例的简单分析tanh公式，在先前的工作中使用仅黑色材料模拟的halo提出和校准，对于在两个非常不同的模拟中鉴定出的光环同样效果很好 - 全面和非物理学和非辐射模型。可以使用此TANH公式来计算缩放关系的映射，该公式取决于光环质量，红移和背景标量场的大小，也非常准确。我们的结果可用于使用SZ和X射线可观察物来准确确定簇质量，并将使用当前和即将进行的Galaxy群集调查中的数据来构成对重力测试的一般框架的一部分。我们还使用$ y _ {\ rm x} $ - 温度关系提出了重力测试，该测试不涉及质量校准。
We test two methods, including one that is newly proposed in this work, for correcting for the effects of chameleon $f(R)$ gravity on the scaling relations between the galaxy cluster mass and four observable proxies. Using the first suite of cosmological simulations that simultaneously incorporate both full physics of galaxy formation and Hu-Sawicki $f(R)$ gravity, we find that these rescaling methods work with a very high accuracy for the gas temperature, the Compton $Y$-parameter of the Sunyaev-Zel'dovich (SZ) effect and the X-ray analogue of the $Y$-parameter. This allows the scaling relations in $f(R)$ gravity to be mapped to their $Λ$CDM counterparts to within a few percent. We confirm that a simple analytical tanh formula for the ratio between the dynamical and true masses of haloes in chameleon $f(R)$ gravity, proposed and calibrated using dark-matter-only simulations in a previous work, works equally well for haloes identified in simulations with two very different -- full-physics and non-radiative -- baryonic models. The mappings of scaling relations can be computed using this tanh formula, which depends on the halo mass, redshift and size of the background scalar field, also at a very good accuracy. Our results can be used for accurate determination of the cluster mass using SZ and X-ray observables, and will form part of a general framework for unbiased and self-consistent tests of gravity using data from present and upcoming galaxy cluster surveys. We also propose an alternative test of gravity, using the $Y_{\rm X}$-temperature relation, which does not involve mass calibration.
