Generalized free energy and excess/housekeeping decomposition in nonequilibrium systems: from large deviations to thermodynamic speed limits
Pith reviewed 2026-05-23 07:31 UTC · model grok-4.3
The pith
A generalized free energy from large deviations governs nonequilibrium dynamics and decomposes dissipation into excess and housekeeping parts.
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
Core claim
The dynamics of genuine nonequilibrium systems that undergo continuous driving are governed by a generalized free energy derived from a large-deviations variational principle. This variational principle also yields a decomposition of fluxes, forces, and dissipation (entropy production) into a conservative excess part and a nonconservative housekeeping part. The excess entropy production obeys a thermodynamic speed limit, a fundamental thermodynamic constraint on the rate of state evolution and/or external fluxes. The approach is universally applicable to stochastic master equations, deterministic chemical reaction networks, and open systems, and is empirically accessible for thermodynamic 2n
What carries the argument
Large-deviations variational principle that defines the generalized free energy and produces the excess/housekeeping decomposition of entropy production.
If this is right
- The excess entropy production obeys a thermodynamic speed limit that bounds the rate of state evolution and external fluxes.
- The decomposition applies universally to stochastic master equations, deterministic chemical reaction networks, and open systems.
- Fundamental dissipation bounds follow for real-world metabolic networks and can identify futile cycles.
- The generalized free energy and decomposition are empirically accessible for thermodynamic inference in stochastic and deterministic systems.
- The framework connects to information geometry and Onsager theory as well as prior excess/housekeeping decompositions.
Where Pith is reading between the lines
- The speed limit could be tested in laboratory-driven systems to quantify how closely real processes approach the bound.
- The decomposition might supply new observables for inferring hidden driving forces in experimental data.
- Extensions to quantum or spatially extended systems would require checking whether the same variational principle still closes.
- The approach could unify earlier housekeeping/excess splits by showing they arise from one large-deviations principle.
Load-bearing premise
The large-deviations variational principle can be applied to the stochastic master equations, deterministic chemical reaction networks, and open systems under consideration to define the generalized free energy and produce the excess/housekeeping split.
What would settle it
A measurement or simulation on a continuously driven system in which the observed excess entropy production rate violates the bound given by the thermodynamic speed limit would falsify the central claim.
Figures
read the original abstract
In genuine nonequilibrium systems that undergo continuous driving, the thermodynamic forces are nonconservative, meaning they cannot be described by any free energy potential. Nonetheless, we show that the dynamics of such systems are governed by a "generalized free energy" that is derived from a large-deviations variational principle. This variational principle also yields a decomposition of fluxes, forces, and dissipation (entropy production) into a conservative "excess" part and a nonconservative "housekeeping" part. Our decomposition is universally applicable to stochastic master equations, deterministic chemical reaction networks, and open systems. We also show that the excess entropy production obeys a thermodynamic speed limit (TSL), a fundamental thermodynamic constraint on the rate of state evolution and/or external fluxes. We demonstrate our approach on several examples, including real-world metabolic networks, where we derive fundamental dissipation bounds and uncover "futile" metabolic cycles. Our generalized free energy and decomposition are empirically accessible to thermodynamic inference in both stochastic and deterministic systems. We discuss important connections to several theoretical frameworks, including information geometry and Onsager theory, as well as previous excess/housekeeping decompositions.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript claims that a large-deviations variational principle yields a generalized free energy governing the dynamics of continuously driven nonequilibrium systems despite nonconservative forces. This principle induces a universal decomposition of fluxes, forces, and entropy production into conservative excess and nonconservative housekeeping components, applicable to stochastic master equations, deterministic chemical reaction networks, and open systems. The excess entropy production obeys a thermodynamic speed limit. The framework is illustrated on examples including metabolic networks, shown to be empirically accessible for inference, and connected to information geometry, Onsager theory, and prior decompositions.
Significance. If the variational construction is rigorously justified and the decomposition remains well-defined, the result would offer a unifying variational foundation for nonequilibrium thermodynamics in driven systems, delivering new speed limits, dissipation bounds, and inference tools with direct applicability to biological networks.
major comments (1)
- [Abstract and sections on deterministic CRNs/open systems] The central claim that the large-deviations variational principle applies to deterministic chemical reaction networks and continuously driven open systems (including those with nonconservative cycles) is load-bearing, yet the abstract provides no explicit rate-function construction or large-volume limit argument showing that the resulting functional acts as a potential for the macroscopic flow when driving is time-dependent.
minor comments (1)
- [Abstract] The abstract states that the approach is demonstrated on real-world metabolic networks but does not specify which networks, what observables were inferred, or how the excess/housekeeping split was validated against data.
Simulated Author's Rebuttal
We thank the referee for the careful reading and constructive feedback. The major comment concerns the presentation of the large-deviations construction for deterministic and open systems. We address it directly below and will revise the manuscript to improve clarity.
read point-by-point responses
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Referee: [Abstract and sections on deterministic CRNs/open systems] The central claim that the large-deviations variational principle applies to deterministic chemical reaction networks and continuously driven open systems (including those with nonconservative cycles) is load-bearing, yet the abstract provides no explicit rate-function construction or large-volume limit argument showing that the resulting functional acts as a potential for the macroscopic flow when driving is time-dependent.
Authors: The explicit rate-function construction, large-volume limit, and resulting variational principle are derived in the main text for stochastic master equations and then extended to the deterministic limit of chemical reaction networks (including open systems with nonconservative cycles). For time-dependent driving the generalized free energy is obtained from the instantaneous large-deviations rate functional, which acts as a potential for the macroscopic flow at each instant; this is shown to induce the excess/housekeeping decomposition and the thermodynamic speed limit. We agree that the abstract is too concise on these technical points and will revise it to include a brief statement of the rate-function construction and the large-volume argument for time-dependent driving. This revision will be made without changing the scope or claims of the work. revision: yes
Circularity Check
No circularity: derivation anchored in external large-deviations variational principle
full rationale
The paper starts from an external large-deviations variational principle applied to stochastic master equations, deterministic chemical reaction networks, and open systems to define the generalized free energy and produce the excess/housekeeping decomposition of fluxes, forces, and entropy production. This principle is presented as an independent starting point from large-deviations theory rather than being constructed from the target quantities. The thermodynamic speed limit on excess entropy production follows directly from the same variational application. No equations reduce the claimed results to fitted parameters, self-definitions, or a load-bearing self-citation chain; prior excess/housekeeping work is referenced for context but is not required to establish the new generalized free energy. The derivation is therefore self-contained against external benchmarks.
Axiom & Free-Parameter Ledger
axioms (1)
- domain assumption Large-deviations principle holds for the stochastic and deterministic systems under continuous driving
Lean theorems connected to this paper
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IndisputableMonolith/Cost/FunctionalEquation.leanwashburn_uniqueness_aczel; Jcost_pos_of_ne_one echoes?
echoesECHOES: this paper passage has the same mathematical shape or conceptual pattern as the Recognition theorem, but is not a direct formal dependency.
σ_ex = max_ϕ [-ẋ·ϕ - j·(e^∇ϕ-1)]; ϕ* satisfies ẋ = -∇^T (j ∘ e^∇ϕ*); σ = σ_ex + σ_hk with σ_hk = min_ϕ D(f ∥ -∇ϕ) (Pythagorean split)
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IndisputableMonolith/Foundation/ArithmeticFromLogic.leanembed_injective; LogicNat orbit structure echoes?
echoesECHOES: this paper passage has the same mathematical shape or conceptual pattern as the Recognition theorem, but is not a direct formal dependency.
excess EPR vanishes in steady state; housekeeping quantifies nonconservative forces; dual form min D(j'∥˜j) s.t. ∇^T j'=ẋ
What do these tags mean?
- matches
- The paper's claim is directly supported by a theorem in the formal canon.
- supports
- The theorem supports part of the paper's argument, but the paper may add assumptions or extra steps.
- extends
- The paper goes beyond the formal theorem; the theorem is a base layer rather than the whole result.
- uses
- The paper appears to rely on the theorem as machinery.
- contradicts
- The paper's claim conflicts with a theorem or certificate in the canon.
- unclear
- Pith found a possible connection, but the passage is too broad, indirect, or ambiguous to say the theorem truly supports the claim.
Forward citations
Cited by 3 Pith papers
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Geometric decomposition of information flow: New insights into information thermodynamics
Information flow in bipartite Markov systems is split into a housekeeping part that maintains correlations through cyclic modes and an excess part that changes mutual information through conservative forces.
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Duality between dissipation-coherence trade-off and thermodynamic speed limit based on thermodynamic uncertainty relation for stochastic limit cycles
Derives duality between dissipation-coherence trade-off and thermodynamic speed limit for general stochastic limit cycles via dual observables substituted into the thermodynamic uncertainty relation in the weak-noise limit.
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Infinite variety of thermodynamic speed limits with general activities
A unified framework based on generalized means derives an infinite family of thermodynamic speed limits for Markov jump processes and chemical reaction networks, each giving a lower bound on entropy production.
Reference graph
Works this paper leans on
-
[1]
Entropy production rate We show how our formalism generalizes to MJPs with odd variables, such as velocity or momentum, whose sign changes under time reversal. We first write the expression of EPR. Consider an MJP coupled to a single heat bath that evolves over a small time interval [t, t+ dt]. The conditional probability that the system is in state j at ...
-
[2]
One impor- tant caveat is that we do not simplify our expressions by using Eq
Generalized free energy and excess/housekeeping decomposition Many of our results continue to hold for systems with odd variables, including the definition of the generalized free en- ergy and the excess/housekeeping decomposition. One impor- tant caveat is that we do not simplify our expressions by using Eq. (3), the relationship between forward and reve...
-
[3]
Example: particle on a ring We provide an example to illustrate our excess/housekeeping decomposition on a system with odd variables. We also com- pare to the HS decomposition, where the housekeeping EPR can take unphysical negative values [67–69]. We use a standard model from the literature on the stochas- tic thermodynamics of systems with odd variables...
-
[4]
I. Procaccia and R. Levine, Potential work: A statistical- mechanical approach for systems in disequilibrium, The Jour- nal of Chemical Physics 65, 3357 (1976)
work page 1976
-
[5]
M. Esposito and C. Van den Broeck, Second law and Landauer principle far from equilibrium, EPL (Europhysics Letters) 95, 40004 (2011)
work page 2011
-
[6]
F. Horn and R. Jackson, General mass action kinetics, Archive for Rational Mechanics and Analysis 47, 81 (1972)
work page 1972
-
[7]
F. Schl ¨ogl, Fluctuations in thermodynamic non equilibrium states, Zeitschrift f¨ ur Physik A Hadrons and nuclei244, 199 (1971)
work page 1971
-
[8]
H. Qian, Relative entropy: Free energy associated with equi- librium fluctuations and nonequilibrium deviations, Physical Review E 63, 042103 (2001)
work page 2001
-
[9]
N. Shiraishi, K. Funo, and K. Saito, Speed limit for classi- cal stochastic processes, Physical review letters 121, 070601 (2018)
work page 2018
-
[10]
S. Ito, Stochastic thermodynamic interpretation of information geometry, Physical Review Letters121, 030605 (2018)
work page 2018
-
[11]
V. T. Vo, T. Van Vu, and Y. Hasegawa, Unified approach to classical speed limit and thermodynamic uncertainty relation, Phys. Rev. E102, 062132 (2020)
work page 2020
-
[12]
K. Yoshimura and S. Ito, Thermodynamic uncertainty relation and thermodynamic speed limit in deterministic chemical re- action networks, Physical Review Letters127, 160601 (2021)
work page 2021
-
[13]
N. Shiraishi, Wasserstein distance in speed limit inequalities for markov jump processes, Journal of Statistical Mechanics: Theory and Experiment 2024, 074003 (2024)
work page 2024
-
[14]
P. Salamon, J. D. Nulton, and R. S. Berry, Length in statistical thermodynamics, The Journal of chemical physics 82, 2433 (1985)
work page 1985
-
[15]
P. Salamon and R. S. Berry, Thermodynamic length and dissi- pated availability, Physical Review Letters51, 1127 (1983)
work page 1983
-
[16]
G. E. Crooks, Measuring Thermodynamic Length, Physical Review Letters 99 (2007)
work page 2007
-
[17]
D. A. Sivak and G. E. Crooks, Thermodynamic Metrics and Optimal Paths, Physical Review Letters108 (2012)
work page 2012
- [18]
- [19]
-
[20]
A. Dechant and Y. Sakurai, Thermodynamic interpretation of Wasserstein distance, arXiv preprint arXiv:1912.08405 (2019)
-
[21]
M. Nakazato and S. Ito, Geometrical aspects of entropy pro- duction in stochastic thermodynamics based on Wasserstein distance, Physical Review Research3, 043093 (2021)
work page 2021
-
[22]
T. Van Vu and K. Saito, Thermodynamic unification of opti- mal transport: Thermodynamic uncertainty relation, minimum dissipation, and thermodynamic speed limits, Physical Review X 13, 011013 (2023)
work page 2023
-
[23]
K. Yoshimura, A. Kolchinsky, A. Dechant, and S. Ito, House- keeping and excess entropy production for general nonlinear dynamics, Physical Review Research5, 013017 (2023)
work page 2023
-
[24]
R. Nagayama, K. Yoshimura, A. Kolchinsky, and S. Ito, Ge- ometric thermodynamics of reaction-diffusion systems: Ther- modynamic trade-off relations and optimal transport for pattern formation, arXiv preprint arXiv:2311.16569 (2023)
work page internal anchor Pith review Pith/arXiv arXiv 2023
-
[25]
S. Ito, Geometric thermodynamics for the fokker–planck equa- tion: stochastic thermodynamic links between information ge- ometry and optimal transport, Information Geometry 7, 441 (2024)
work page 2024
- [26]
-
[27]
R. Graham and T. T´el, Nonequilibrium potential for coexisting attractors, Physical Review A33, 1322 (1986)
work page 1986
-
[28]
B. Derrida, J. L. Lebowitz, and E. R. Speer, Free Energy Func- tional for Nonequilibrium Systems: An Exactly Solvable Case, Physical Review Letters87, 150601 (2001)
work page 2001
- [29]
- [30]
-
[31]
P. Glansdorff and I. Prigogine, Non-equilibrium stability the- ory, Physica 46, 344 (1970), publisher: Elsevier
work page 1970
-
[32]
J. Schnakenberg, Network theory of microscopic and macro- scopic behavior of master equation systems, Reviews of Mod- ern physics 48, 571 (1976)
work page 1976
-
[33]
Y. Oono and M. Paniconi, Steady state thermodynamics, Progress of Theoretical Physics Supplement 130, 29 (1998)
work page 1998
-
[34]
T. Hatano and S.-i. Sasa, Steady-state thermodynamics of Langevin systems, Physical Review Letters86, 3463 (2001)
work page 2001
-
[35]
M. Esposito, U. Harbola, and S. Mukamel, Entropy fluctua- tion theorems in driven open systems: Application to electron counting statistics, Physical Review E76, 031132 (2007)
work page 2007
-
[36]
T. S. Komatsu, N. Nakagawa, S.-i. Sasa, and H. Tasaki, Steady-state thermodynamics for heat conduction: micro- scopic derivation, Physical Review Letters100, 230602 (2008)
work page 2008
-
[37]
T. Sagawa and H. Hayakawa, Geometrical expression of excess entropy production, Physical Review E84, 051110 (2011)
work page 2011
-
[38]
C. Maes and K. Neto ˇcn` y, A nonequilibrium extension of the Clausius heat theorem, Journal of Statistical Physics 154, 188 (2014)
work page 2014
-
[39]
E. Smith, Intrinsic and extrinsic thermodynamics for stochastic population processes with multi-level large-deviation structure, Entropy 22, 1137 (2020)
work page 2020
-
[40]
J. S. Lee, S. Lee, H. Kwon, and H. Park, Speed limit for a highly irreversible process and tight finite-time Landauer’s bound, Phys. Rev. Lett.129, 120603 (2022)
work page 2022
-
[41]
L. Bertini, D. Gabrielli, G. Jona-Lasinio, and C. Landim, Clau- sius inequality and optimality of quasistatic transformations for nonequilibrium stationary states, Physical Review Letters110, 020601 (2013)
work page 2013
-
[42]
D. Mandal and C. Jarzynski, Analysis of slow transitions be- tween nonequilibrium steady states, Journal of Statistical Me- chanics: Theory and Experiment 2016, 063204 (2016)
work page 2016
-
[43]
M. Esposito and C. Van den Broeck, Three detailed fluctuation theorems, Physical Review Letters104, 090601 (2010)
work page 2010
- [44]
- [45]
-
[46]
T. Van Vu and K. Saito, Topological speed limit, Physical 25 review letters 130, 010402 (2023)
work page 2023
-
[47]
See the supplemental material
-
[48]
T. J. Kobayashi, D. Loutchko, A. Kamimura, and Y. Sug- hiyama, Hessian geometry of nonequilibrium chemical reac- tion networks and entropy production decompositions, Physi- cal Review Research 4, 033208 (2022)
work page 2022
-
[49]
T. J. Kobayashi, D. Loutchko, A. Kamimura, S. A. Horiguchi, and Y. Sughiyama, Information geometry of dynamics on graphs and hypergraphs, Information Geometry 7, 97 (2024)
work page 2024
-
[50]
Feinberg, Foundations of Chemical Reaction Network The- ory, Applied Mathematical Sciences, Vol
M. Feinberg, Foundations of Chemical Reaction Network The- ory, Applied Mathematical Sciences, Vol. 202 (Springer Inter- national Publishing, Cham, 2019)
work page 2019
-
[51]
D. Kondepudi and I. Prigogine, Modern thermodynamics: from heat engines to dissipative structures(John Wiley & Sons, 2014)
work page 2014
-
[52]
D. A. Beard and H. Qian, Relationship between thermody- namic driving force and one-way fluxes in reversible processes, PloS one 2, e144 (2007)
work page 2007
-
[53]
Maes, Local detailed balance, SciPost Physics Lecture Notes , 032 (2021)
C. Maes, Local detailed balance, SciPost Physics Lecture Notes , 032 (2021)
work page 2021
-
[54]
I. Prigogine and R. Lefever, Symmetry breaking instabilities in dissipative systems. II, The Journal of Chemical Physics48, 1695 (1968)
work page 1968
- [55]
-
[56]
H. Spohn, Large Scale Dynamics of Interacting Particles (Springer Berlin Heidelberg, Berlin, Heidelberg, 1991)
work page 1991
- [57]
- [58]
-
[59]
Touchette, The large deviation approach to statistical me- chanics, Physics Reports 478, 1 (2009)
H. Touchette, The large deviation approach to statistical me- chanics, Physics Reports 478, 1 (2009)
work page 2009
-
[60]
D. F. Anderson, G. Craciun, M. Gopalkrishnan, and C. Wiuf, Lyapunov Functions, Stationary Distributions, and Non- equilibrium Potential for Reaction Networks, Bulletin of Math- ematical Biology 77, 1744 (2015)
work page 2015
- [61]
-
[62]
J. Wang, L. Xu, and E. Wang, Potential landscape and flux framework of nonequilibrium networks: robustness, dissipa- tion, and coherence of biochemical oscillations, Proceedings of the National Academy of Sciences 105, 12271 (2008)
work page 2008
-
[63]
F. Schl ¨ogl, On stability of steady states, Zeitschrift f¨ ur Physik A Hadrons and nuclei 243, 303 (1971)
work page 1971
-
[64]
T. Speck and U. Seifert, Integral fluctuation theorem for the housekeeping heat, Journal of Physics A: Mathematical and General 38, L581 (2005)
work page 2005
-
[65]
M. Esposito and C. Van den Broeck, Three faces of the second law. I. Master equation formulation, Physical Review E 82, 011143 (2010)
work page 2010
-
[66]
Hu Gang, Stationary solution of master equations in the large- system-size limit, Physical Review A36, 5782 (1987)
work page 1987
-
[67]
L. Bertini, A. De Sole, D. Gabrielli, G. Jona-Lasinio, and C. Landim, Macroscopic fluctuation theory, Reviews of Mod- ern Physics 87, 593 (2015)
work page 2015
-
[68]
G. Falasco and M. Esposito, Macroscopic Stochastic Thermo- dynamics (2023), arXiv:2307.12406 [cond-mat, physics:math- ph]
- [69]
-
[70]
I. J. Ford and R. E. Spinney, Entropy production from stochastic dynamics in discrete full phase space, Physical Review E 86, 021127 (2012)
work page 2012
-
[71]
R. E. Spinney and I. J. Ford, Nonequilibrium thermodynamics of stochastic systems with odd and even variables, Physical Review Letters 108, 170603 (2012)
work page 2012
-
[72]
H. K. Lee, C. Kwon, and H. Park, Fluctuation theorems and entropy production with odd-parity variables, Physical Review Letters 110, 050602 (2013)
work page 2013
-
[73]
R. Garc ´ıa-Garc´ıa, Nonadiabatic entropy production for non- Markov dynamics, Physical Review E86, 031117 (2012)
work page 2012
-
[74]
A. Dechant, S.-i. Sasa, and S. Ito, Geometric decomposition of entropy production in out-of-equilibrium systems, Physical Review Research 4, L012034 (2022)
work page 2022
-
[75]
A. Dechant, S.-i. Sasa, and S. Ito, Geometric decomposition of entropy production into excess, housekeeping, and coupling parts, Phys. Rev. E106, 024125 (2022)
work page 2022
-
[76]
J.-C. Delvenne and G. Falasco, Thermokinetic relations, Phys- ical Review E 109, 014109 (2024)
work page 2024
-
[77]
D.-K. Kim, Y. Bae, S. Lee, and H. Jeong, Learning entropy production via neural networks, Physical Review Letters 125, 140604 (2020)
work page 2020
- [78]
-
[79]
S. Boyd and L. Vandenberghe, Convex optimization (Cam- bridge university press, 2004)
work page 2004
- [80]
discussion (0)
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