论文标题
$ f（q）$重力的宇宙学
Cosmography in $f(Q)$ gravity
论文作者
论文摘要
宇宙学是以模型无关的方式研究宇宙宇宙扩展历史的理想工具。修改后的重力理论中的运动方程通常非常复杂。宇宙学可以选择实用模型，而无需先验任意选择。我们使用独立于模型的方式来推导$ f（z）$及其衍生物在可测量的磁学参数方面最高为第四阶。然后，我们将这些功能直接拟合到光度距离中。我们通过考虑三个不同集合函数来执行MCMC分析。使用最大的Supernovae IA Pantheon样品，我们得出了Hubble常数$ H_0 $和COSMographic函数的约束，并发现Luminosity距离的Taylor扩展中的前两个术语在$ f（q）$重力中显着起作用。
Cosmography is an ideal tool to investigate the cosmic expansion history of the Universe in a model-independent way. The equations of motion in modified theories of gravity are usually very complicated; cosmography may select practical models without imposing arbitrary choices a priori. We use the model-independent way to derive $f(z)$ and its derivatives up to fourth order in terms of measurable cosmographic parameters. We then fit those functions into the luminosity distance directly. We perform the MCMC analysis by considering three different sets of cosmographic functions. Using the largest supernovae Ia Pantheon sample, we derive the constraints on the Hubble constant $H_0$ and the cosmographic functions, and find that the former two terms in Taylor expansion of luminosity distance work dominantly in $f(Q)$ gravity.
