The linear volume relaxation and the nonlinear volume aging of a glass-forming liquid are measured, directly compared, and used to extract the out-of-equilibrium relaxation time. This opens a window to investigate how the relaxation time depends on temperature, structure, and volume in parts of phase space that are not accessed by the equilibrium liquid. It is found that the temperature dependence of relaxation time is non-Arrhenius even in the isostructural case—challenging the Adam-Gibbs entropy model. Based on the presented data and the idea that aging happens through quasiequilibrium states, we suggest a mapping of the out-of-equilibrium states during isobaric aging to the equilibrium phase diagram. This mapping implies the existence of isostructural lines in the equilibrium phase diagram. The relaxation time is found to depend on the bath temperature, density, and a just single structural parameter, referred to as an effective temperature.

中文翻译：

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将等压老化映射到平衡相图

测量玻璃形成液的线性体积弛豫和非线性体积老化，直接进行比较，并用于提取失衡的弛豫时间。这打开了一个窗口，以研究弛豫时间如何取决于温度，结构和平衡液体无法访问的相空间部分中的体积。发现即使在同构情况下，弛豫时间对温度的依赖性也不是阿累尼乌斯，这也挑战了Adam-Gibbs熵模型。根据提供的数据和通过准平衡态发生老化的想法，我们建议将等压老化过程中的失衡态映射到平衡相图。这种映射意味着平衡相图中存在同构线。