The latest results on baryon acoustic oscillations from DESI (Dark Energy Spectroscopic Instrument), when combined with cosmic microwave background and supernova data, show indications of a deviation from a cosmological constant in favour of evolving dark energy. Use of a pivot scale for the equation of state w shows that this evidence is concentrated in the derivative of w rather than its mean offset from -1, indicating a new cosmic coincidence where the mean equation of state matches that of the ΛCDM model precisely in the region probed by the observations. An equivalent way to express this is to say that the dark energy hits the maximum value that it will ever achieve within the observed window. We argue that conclusions on dark energy evolution are strongly driven by the assumed parameter priors and that this coincidence, which we are naming the PhantomX coincidence (where X stands for crossing), may be a signature of this.

中文翻译：

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解释 DESI 关于暗能量进化的证据


DESI（暗能量光谱仪）关于重子声学振荡的最新结果，当与宇宙微波背景和超新星数据相结合时，显示出偏离宇宙学常数的迹象，有利于不断发展的暗能量。对状态方程 w 使用枢轴刻度表明，该证据集中在 w 的导数中，而不是它与 -1 的平均偏移量，这表明一种新的宇宙巧合，其中状态的平均方程与 ΛCDM 模型的平均方程相匹配，恰好在观测探测的区域内。表达这一点的等效方式是说暗能量达到了它在观察到的窗口内所能达到的最大值。我们认为，关于暗能量演化的结论在很大程度上是由假设的参数先验驱动的，而这种巧合，我们将其命名为 PhantomX 巧合（其中 X 代表交叉），可能是这种情况的一个特征。