标题： 暗物质领域的统一TDiff不变场论 显示英文标题

标题： A unified TDiff invariant field theory for the dark sector

摘要： 在这项工作中，我们提出了一个用于宇宙学暗物质的统一模型。该理论基于一个简单最小耦合的标量场，其作用量仅包含规范动能项，并且在横向微分同胚（TDiff）下具有不变性。该模型与 $\Lambda$CDM 拥有相同数量的自由参数。 我们将模型在背景水平上的预测与来自Planck 2018 CMB距离先验数据、Pantheon+和SH0ES SNIa距离模量数据、来自6dFGS、BOSS、eBOSS和DES的BAO数据点以及来自宇宙时钟的哈勃参数测量值进行对比。该模型在联合拟合分析中表现出色，在偏差信息准则（DIC）中显示出非常强的证据，优于 $\Lambda$CDM。 我们还表明，Planck 2018和SH0ES测量之间的哈勃张力可以在统一的TDiff模型中得到缓解，尽管仍需要进一步分析。 显示英文摘要

摘要： In this work we present a unified model for the cosmological dark sector. The theory is based on a simple minimally coupled scalar field whose action only contains a canonical kinetic term and is invariant under transverse diffeomorphisms (TDiff). The model has the same number of free parameters as $\Lambda$CDM. We confront the predictions of the model at the background level with data from Planck 2018 CMB distance priors, Pantheon+ and SH0ES SNIa distance moduli, BAO data points from 6dFGS, BOSS, eBOSS and DES and measurements of the Hubble parameter from cosmic chronometers. The model provides excellent results in the joint fit analysis, showing very strong evidence compared to $\Lambda$CDM in the deviance information criterion (DIC). We also show that the Hubble tension between Planck 2018 and SH0ES measurements can be alleviated in the unified TDiff model although further analysis is still needed.