02471nas a2200193   4500008004100000022001400041245008300055210006900138260000900207300001100216490000800227520182000235100002002055700002502075700001702100700002002117700003402137856010602171       2025                        eng d  a0021-960600aDynamic signature of the thermodynamic transition in a novel mean field system0 aDynamic signature of the thermodynamic transition in a novel mea  cAUG   a0845100 v1633 a<p>
	Understanding the connection between thermodynamics and dynamics in glass-forming liquids remains a central challenge in condensed matter physics. In this study, we investigate a novel model system that enables a continuous crossover from a standard three dimensional liquid to a fully connected mean field like system by introducing pseudo neighbors. These pseudo neighbors enhance the effective connectivity of the system without altering its local structure. While their presence slows down the dynamics, they influence thermodynamic properties even more significantly. In particular, the configurational entropy obtained via thermodynamic integration vanishes at a temperature much higher than the temperature where the dynamics begin to slow down, leading to a clear breakdown of the Adam-Gibbs relation. To uncover a possible dynamical signature of this thermodynamic transition, we analyze bond breakage dynamics. Unlike real-real bonds, which decay similarly in both the parent Kob-Andersen model and its mean field variant, real-pseudo bonds exhibit long lived, persistent behavior with strong temperature dependence. These bonds do not fully decay over time, leading to a finite saturation value of the bond breakage correlation function. Remarkably, we show that the number of surviving pseudo bonds can be analytically estimated and correlates directly with the thermodynamic transition temperature T-K. We propose a phenomenological relation between T-K and the number of surviving pseudo-bonds, establishing a novel link between thermodynamic and dynamic observables. Our results suggest that these persistent pseudo bonds serve as a robust dynamical signature of the thermodynamic transition, and the system might have properties analogous to those of randomly bonded ultrastable glasses.</p>
1 aAnwar, Ehtesham1 aNandi, Ujjwal, Kumar1 aPatel, Palak1 aKumawat, Sanket1 aBhattacharyya, Sarika, Maitra  uhttps://library.ncl.res.in/content/dynamic-signature-thermodynamic-transition-novel-mean-field-system