标题： 暗能量领域中AdS存在的 quintessential 意义 显示英文标题

标题： Quintessential Implications of the presence of AdS in the Dark Energy sector

摘要： 我们研究了在暗能量（DE）领域纳入反德西特（AdS）真空态的影响，结合近期的DESI BAO测量数据以及Planck-2018 CMB、Pantheon-Plus(+SH0ES)超新星和KiDS弱透镜数据。 我们表明，在DE领域中存在一个{\it 负宇宙学常数}（$\Lambda < 0$，nCC）与演化部分（由CPL参数化建模）允许在一致于不同观测数据的约束参数空间内存在{\it 非幻影}区域的DE。 这本质上解决了在DE领域中通过合理场论难以获得的{\it 幽灵}行为问题。 此外还研究了DE领域中nCC对不同宇宙学张力的影响。 我们的发现强调了AdS在DE领域对于理论模型构建的重要性，特别是在量子引力理论（例如弦理论）的背景下。 显示英文摘要

摘要： We explore the implications of incorporating an Anti-de Sitter (AdS) vacua in the Dark Energy (DE) sector using the recent DESI BAO measurements in combination with Planck-2018 CMB, Pantheon-Plus(+SH0ES) supernovae and KiDS weak lensing data. We show that the presence of a {\it Negative Cosmological Constant} ($\Lambda < 0$, nCC) together with an evolving part (modelled by the CPL parametrisation) in DE sector allows a {\it non-phantom} region for the DE in the constrained parameter space consistent with different observational data. This essentially solves the problem of {\it phantom} behaviour in the DE sector which is difficult to obtain through reasonable field theory. The implications nCC in the DE sector for different cosmological tensions are also studied. Our findings highlight the importance of the presence of AdS in the DE sector for theoretical model building, especially in the context of quantum gravity theories, e.g. string theory.