论文标题
$ f（q）$理论的宇宙解决方案的观察限制
Observational constraints on cosmological solutions of $f(Q)$ theories
论文作者
论文摘要
在过去的几年中，$ f（q）$理论收集了一些兴趣，这是取代爱因斯坦重力处方的新候选人。非金属张量$ Q $允许提出自由扭转连接的假设，因此，考虑到动作中的新自由度。这项工作着重于$ f（q）$理论的类别，其特征是存在通用幂律术语，该术语加起来符合标准（在动作中的$ q $项中的线性）以及由它们产生的新宇宙学场景。使用Markov链Montecarlo方法，我们依靠背景数据（例如IA型超新星发光性和直接哈勃数据（来自宇宙时钟）以及宇宙微波背景变化和Baryon声学振荡数据，进行了统计测试。这使我们能够在这些新宇宙学和（coostance）$λ$ CDM设置之间进行多方面的比较。我们得出的结论是，在当前的精度级别上，我们的$ f（q）$模型的最佳拟合与其特定参数的值相对应，这使得它们与我们的一般相对性“échantillon”几乎没有区别，即$λ$ cdm。
Over the last years some interest has been gathered by $f(Q)$ theories, which are new candidates to replace Einstein's prescription for gravity. The non-metricity tensor $Q$ allows to put forward the assumption of a free torsionless connection and, consequently, new degrees of freedom in the action are taken into account. This work focuses on a class of $f(Q)$ theories, characterized by the presence of a general power-law term which adds up to the standard (linear in) $Q$ term in the action, and on new cosmological scenarios arising from them. Using the Markov chain Montecarlo method we carry out statistical tests relying upon background data such as Type Ia Supernovae luminosities and direct Hubble data (from cosmic clocks), along with Cosmic Microwave Background shift and Baryon Acoustic Oscillations data. This allows us to perform a multifaceted comparison between these new cosmologies and the (concordance) $Λ$CDM setup. We conclude that, at the current precision level, the best fits of our $f(Q)$ models correspond to values of their specific parameters which make them hardly distinguishable from our General Relativity "échantillon", that is $Λ$CDM.
