{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"704ffc8403b4e93c0d862b6ae88107c64bcda96ba4e5806a8f40606736b3d030","created":"2026-10-03T07:18:11Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"6b1539d000658c38e0c510a5cff135025284739dfa96a01bfa44c9c0fc17d8fb","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"stat.nonequilibrium-steady-states.steady-state-thermodynamics","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"Equilibrium thermodynamics predicts what happens when systems are put in contact or split into phases using a few numbers such as temperature and chemical potential. Whether driven macroscopic systems have a similar small set of numbers with the same predictive power is unknown.","posed_since":"2006","precise":"For driven lattice gases and boundary-driven diffusive systems described by macroscopic fluctuation theory, determine whether intensive variables and a free-energy-like function, defined from isolated steady states (as in Sasa-Tasaki steady-state thermodynamics), predict beyond linear response the outcome of macroscopic operations: contact between systems, phase coexistence, and response to slow changes of parameters. Answer: yes with the construction and its domain, or a no-go result with counterexamples.","problem_ref":null,"references":"","settled_by":"A proof that such a construction predicts contact and coexistence for a stated class of driven models, or explicit models in which no single-system variables can do so.","status_note":"","title":"Existence of a thermodynamics for macroscopic driven steady 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