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- W3103808145 abstract "This paper derives and discusses the configuration-space Langevin equation describing a physically aging R-simple system and the corresponding Smoluchowski equation. Externally controlled thermodynamic variables like temperature, density, pressure enter the description via the single parameter ${T}_{rm s}/T$ in which $T$ is the bath temperature and ${T}_{rm s}$ is the systemic temperature defined at any time $t$ as the thermodynamic equilibrium temperature of the state point with density $rho(t)$ and potential energy $U(t)$. In equilibrium ${T}_{rm s}cong T$ with fluctuations that vanish in the thermodynamic limit. In contrast to Tool's fictive temperature and other effective temperatures in glass science, the systemic temperature is defined for any configuration with a well-defined density, even if it is not in any sense close to equilibrium. Density and systemic temperature define an aging phase diagram in which the aging system traces out a curve. Predictions are discussed for aging following various density-temperature and pressure-temperature jumps from one equilibrium state to another, as well as for a few other scenarios. The proposed theory implies that R-simple glass-forming liquids are characterized by a dynamic Prigogine-Defay ratio of unity." @default.
- W3103808145 created "2020-11-23" @default.
- W3103808145 creator A5088731144 @default.
- W3103808145 date "2018-04-17" @default.
- W3103808145 modified "2023-09-24" @default.
- W3103808145 title "Isomorph theory of physical aging" @default.
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