标题： 物理暗能量与幻影暗能量在DESI之后：弯曲背景下的解冻 quintessence 显示英文标题

标题： Physical vs phantom dark energy after DESI: thawing quintessence in a curved background

摘要： 近期来自DESI的数据，结合其他数据，提供了暗能量动力学的中等证据，即$w\neq-1$。在$w_0, w_a$暗能量的$w$参数化中，存在对红移为$z\sim0.5$的幻象穿越，即$w<-1$的偏好。在广义相对论中，幻象状态方程是不物理的。因此，检查在其他物理上自洽且与$w_0, w_a$参数化具有等效证据的暗能量模型中是否存在幻象穿越是很重要的。我们发现，在非零宇宙曲率的情况下，解冻型 quintessence 在平坦背景下能稍微更好地拟合最近的数据，优于$w_0,w_a$。幻象穿越可能是基于非物理模型的参数化产生的虚假效应。 显示英文摘要

摘要： Recent data from DESI, in combination with other data, provide moderate evidence of dynamical dark energy, $w\neq-1$. In the $w_0, w_a$ parametrization of $w$, there is a preference for a phantom crossing, $w<-1$, at redshift $z\sim0.5$. In general relativity, the phantom equation of state is unphysical. Thus it is important to check whether phantom crossing is present in other physically self-consistent models of dark energy that have equivalent evidence to the $w_0, w_a$ parametrization. We find that thawing quintessence with nonzero cosmic curvature can fit the recent data slightly better than $w_0, w_a$ in a flat background. The phantom crossing may be a spurious artifact of a parametrization that is not based on a physical model.