标题： 定质量子简无力证据 显示英文标题

标题： Scant evidence for thawing quintessence

摘要： 对宇宙膨胀率的新限制似乎更倾向于演化的暗能量，以“退冻” quintessence 模型的形式存在，即具有标准最小耦合标量场的模型，在晚期开始从势能主导中演化。 我们通过探索“退冻” quintessence 对状态方程的预测来仔细检查其证据。 我们表明，以通常的 Chevalier-Polarski-Linder 参数（$w_0$，$w_a$）表示，“退冻” quintessence 实际上仅与当前数据集勉强一致。 尽管如此，我们接受“退冻” quintessence 是暗能量的可能性，并对该场景的微观物理特性加以限制。 我们通过对标量场势的有效质量$m^2$和能量尺度$V_0$进行描述。 我们特别注意对这些参数施加非信息性、平坦先验，以尽量减少它们对最终后验的影响。 虽然当前数据倾向于较大的负值$m^2$，但当我们比较这些模型与标准$\Lambda$CDM 模型时，发现几乎没有证据支持“退冻” quintessence。 显示英文摘要

摘要： New constraints on the expansion rate of the Universe seem to favor evolving dark energy in the form of thawing quintessence models, i.e., models for which a canonical, minimally coupled scalar field has, at late times, begun to evolve away from potential energy domination. We scrutinize the evidence for thawing quintessence by exploring what it predicts for the equation of state. We show that, in terms of the usual Chevalier-Polarski-Linder parameters, ($w_0$, $w_a$), thawing quintessence is, in fact, only marginally consistent with a compilation of the current data. Despite this, we embrace the possibility that thawing quintessence is dark energy and find constraints on the microphysics of this scenario. We do so in terms of the effective mass $m^2$ and energy scale $V_0$ of the scalar field potential. We are particularly careful to enforce un-informative, flat priors on these parameters so as to minimize their effect on the final posteriors. While the current data favors a large and negative value of $m^2$, when we compare these models to the standard $\Lambda$CDM model we find that there is scant evidence for thawing quintessence.