标题： 暗区的统一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： 在本工作中，我们提出了一个统一的宇宙学暗物质领域模型。该理论基于一个简单的最小耦合标量场，其作用仅包含规范动能项，并且在横向微分同胚（TDiff）下不变。该模型的自由参数数量与$\Lambda$CDM 相同。我们将该模型在背景水平上的预测与普朗克2018年CMB距离先验数据、Pantheon+和SH0ES超新星距离模数、6dFGS、BOSS、eBOSS和DES的BAO数据点以及宇宙时钟测量的哈勃参数进行了对比。该模型在联合拟合分析中表现出色，在偏差信息准则（DIC）下与$\Lambda$CDM 相比显示出非常强烈的证据。我们还表明，尽管仍需进一步分析，统一的TDiff模型可以缓解普朗克2018与SH0ES测量之间的哈勃张力。 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.