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cond-mat.stat-mech2025
Exact fluctuation relation for open systems beyond the Zwanzig FEP equation
Mohammad Rahbar, Christopher J. Stein
We develop a fluctuation framework to quantify the free energy difference between two equilibrium states connected by nonequilibrium processes under arbitrary dynamics and system-e…
cond-mat.stat-mech2025
Exact and variational identities for free energy differences in strongly coupled open systems
Mohammad Rahbar, Christopher J. Stein
We derive exact identities for open systems connecting two equilibrium endpoints without imposing microscopic reversibility, detailed balance (DB), fluctuation-dissipation structur…
cond-mat.stat-mech2025
Thermodynamic potentials from a probabilistic view on the system-environment interaction energy
Mohammad Rahbar, Christopher J. Stein
In open systems with strong coupling, the interaction energy between the system and the environment is significant, so thermodynamic quantities cannot be reliably obtained by tradi…