# Udo Seifert

**Udo Seifert** is a theoretical physicist and one of the pioneers of stochastic thermodynamics, the framework that extends work, heat, and entropy production to the level of individual fluctuating trajectories of nonequilibrium systems.<sup>[1](https://www.itp2.uni-stuttgart.de/institute/teamlist/Seifert-00001/)</sup><sup> • </sup><sup>[2](https://assets.cambridge.org/97813165/19554/frontmatter/9781316519554_frontmatter.pdf)</sup> He has been Full Professor for Theoretical Physics at the University of Stuttgart since September 2001, working at the II. Institute for Theoretical Physics.<sup>[1](https://www.itp2.uni-stuttgart.de/institute/teamlist/Seifert-00001/)</sup>

| Key facts | |
|---|---|
| Field | Stochastic thermodynamics<sup>[2](https://assets.cambridge.org/97813165/19554/frontmatter/9781316519554_frontmatter.pdf)</sup> |
| Chair | Full Professor for Theoretical Physics, University of Stuttgart, since September 2001<sup>[1](https://www.itp2.uni-stuttgart.de/institute/teamlist/Seifert-00001/)</sup> |
| Training | Diploma in Physics 1985, PhD 1989, Habilitation 1995, all at LMU Munich<sup>[1](https://www.itp2.uni-stuttgart.de/institute/teamlist/Seifert-00001/)</sup> |
| Signature work | "Entropy Production along a Stochastic Trajectory and an Integral Fluctuation Theorem", Physical Review Letters 95, 040602 (2005)<sup>[3](https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.95.040602)</sup> |
| Defining review | "Stochastic thermodynamics, fluctuation theorems and molecular machines", Reports on Progress in Physics 75, 126001 (2012)<sup>[4](https://iopscience.iop.org/article/10.1088/0034-4885/75/12/126001)</sup> |
| Textbook | *Stochastic Thermodynamics*, Cambridge University Press, June 2025<sup>[5](https://www.cambridge.org/core/books/stochastic-thermodynamics/1766FFBF10FCC7A75DAA89C6E09ED0AB)</sup> |
| Recent activity | Papers in PNAS (2024), Physical Review Research (2024), a review of entropy-production bounds (2025), and Physical Review E (2026)<sup>[6](https://www.pnas.org/doi/abs/10.1073/pnas.2405371121)</sup><sup> • </sup><sup>[7](https://arxiv.org/html/2512.07772)</sup> |

## Career and training

Seifert completed all three of his German academic qualifications at Ludwig-Maximilians-Universität München: a Diploma in Physics in 1985, a PhD in 1989, and a [Habilitation](https://www.edgepedia.org/habilitation) in 1995.<sup>[1](https://www.itp2.uni-stuttgart.de/institute/teamlist/Seifert-00001/)</sup> His habilitation thesis, on fluid membranes and vesicle conformations, was submitted in October 1994, with a report version published that year through [Forschungszentrum Jülich](https://www.edgepedia.org/forschungszentrum-julich).<sup>[8](https://doi.org/10.18419/opus-8858)</sup>

His early positions followed a dated path: research assistant at LMU Munich from January 1989 to September 1990; postdoc at [Simon Fraser University](https://www.edgepedia.org/simon-fraser-university) in Vancouver from October 1990 to October 1992; research fellow at Research Center Jülich from November 1992 to October 1994; and staff scientist at the Max Planck Institute of Colloids and Interfaces in Golm from November 1994 to August 2001.<sup>[1](https://www.itp2.uni-stuttgart.de/institute/teamlist/Seifert-00001/)</sup> He took up the [Stuttgart](https://www.edgepedia.org/stuttgart) chair in September 2001 and declined a full professorship in Physics of Complex Systems offered by the University of Heidelberg in 2008.<sup>[1](https://www.itp2.uni-stuttgart.de/institute/teamlist/Seifert-00001/)</sup>

According to his University of Stuttgart profile, he has held editorial posts across the field's main journals: Divisional Associate Editor of Physical Review Letters (2007–2009), Co-Editor of Europhysics Letters (2007–2014) and of New Journal of Physics (2012–2017), and Editorial Board member of [Physical Review E](https://www.edgepedia.org/physical-review-e) since January 2018.<sup>[1](https://www.itp2.uni-stuttgart.de/institute/teamlist/Seifert-00001/)</sup> 

## Vesicle and membrane physics

Seifert worked on the shapes of fluid membranes and vesicles. The [German Research Foundation](https://www.edgepedia.org/german-research-foundation) (DFG) funded his subsequent work bridging membranes and nonequilibrium physics: a project on the fluidics of micro-capsules in shear flow from 2004 to 2011, one on a self-consistent theory of membrane and vesicle interactions with substrates from 2006 to 2010, and a project on an extended fluctuation-dissipation theorem for driven colloidal suspensions from 2008 to 2018.<sup>[9](https://gepris.dfg.de/person/1816140)</sup>

## Stochastic thermodynamics and fluctuation theorems

**Stochastic thermodynamics** provides a framework for extending the notions of classical thermodynamics, such as work, heat, and entropy production, to the level of individual trajectories of well-defined nonequilibrium ensembles. It applies whenever a nonequilibrium process is still coupled to one or several heat baths of constant temperature; paradigmatic systems are single colloidal particles in time-dependent laser traps, polymers in external flow, and enzymes and molecular motors in single-molecule assays.<sup>[4](https://iopscience.iop.org/article/10.1088/0034-4885/75/12/126001)</sup> Conceptually, the framework combines the stochastic energetics approach with the idea that entropy can consistently be assigned to a single fluctuating trajectory, yielding a first-law-like energy balance of work, heat, and internal energy along that trajectory.<sup>[10](https://ar5iv.labs.arxiv.org/html/0710.1187)</sup>

His 2005 [Physical Review Letters](https://www.edgepedia.org/physical-review-letters) paper showed that the total entropy produced along a single stochastic trajectory, comprising both genuine particle entropy and entropy production in the surrounding medium, obeys the integral fluctuation theorem ⟨exp[−Δs_tot]⟩ = 1, for arbitrary initial conditions and arbitrary time-dependent driving over a finite time interval, for dynamics described by a [Langevin equation](https://www.edgepedia.org/langevin-equation) or a master equation.<sup>[3](https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.95.040602)</sup> This gave the fluctuation theorems, including the Jarzynski relation of 1997, a common trajectory-level footing: within the framework, the Jarzynski relation can be derived and shown to be a special case of a more general relation.<sup>[10](https://ar5iv.labs.arxiv.org/html/0710.1187)</sup> In nonequilibrium steady states, a generalized fluctuation-dissipation theorem involving entropy production holds.<sup>[4](https://iopscience.iop.org/article/10.1088/0034-4885/75/12/126001)</sup>

His 2012 review in Reports on Progress in Physics, published on 20 November 2012, derived the integral and detailed fluctuation theorems in a unifying approach from one master theorem.<sup>[4](https://iopscience.iop.org/article/10.1088/0034-4885/75/12/126001)</sup>

## Thermodynamic uncertainty relation and thermodynamic inference

The thermodynamic uncertainty relation, discovered in 2015, provides a lower bound on entropy production through measurements of the dispersion of any current in the system; it quantifies the cost of temporal precision for biomolecular processes and provides a model-free bound on the thermodynamic efficiency of molecular motors and microscopic heat engines.<sup>[11](https://www.dpg-verhandlungen.de/year/2023/conference/skm/part/plv/session/4/contribution/1)</sup> Building on such constraints, thermodynamic inference uses consistency conditions from stochastic thermodynamics to infer otherwise hidden properties of nonequilibrium systems, including model-free upper bounds on the efficiency of molecular motors and the minimal number of intermediate states in enzymatic networks.<sup>[12](https://www.annualreviews.org/content/journals/10.1146/annurev-conmatphys-031218-013554)</sup>

## Textbook and recognition

Seifert presented a plenary lecture, "Stochastic thermodynamics: From concepts to model-free inference", at the 2023 spring meeting of the [German Physical Society](https://www.edgepedia.org/german-physical-society) (DPG).<sup>[11](https://www.dpg-verhandlungen.de/year/2023/conference/skm/part/plv/session/4/contribution/1)</sup> His graduate-level textbook *Stochastic Thermodynamics* was published by [Cambridge University Press](https://www.edgepedia.org/cambridge-university-press) in June 2025, covering work, heat, and entropy production along individual stochastic trajectories, fluctuation relations beyond linear response, and applications including molecular motors, chemical reaction networks, active particles, [stochastic heat engines](https://www.edgepedia.org/stochastic-heat-engine), and information machines.<sup>[5](https://www.cambridge.org/core/books/stochastic-thermodynamics/1766FFBF10FCC7A75DAA89C6E09ED0AB)</sup> The publisher's front matter notes that he has taught a graduate-level course on the subject at Stuttgart for several years.<sup>[2](https://assets.cambridge.org/97813165/19554/frontmatter/9781316519554_frontmatter.pdf)</sup>

## Recent developments

Seifert has remained active through 2026. In 2023 his group published a framework of Markovian events and snippets in Physical Review Letters (130, 257101), generalized in 2024 to fluctuating coarse-grained entropy production in [Physical Review Research](https://www.edgepedia.org/physical-review-research) (6, 023175).<sup>[13](https://indico.fysik.su.se/event/8135/contributions/13870/attachments/5972/7818/stockholm24.pdf)</sup> A 2024 PNAS paper introduced a fluctuating entropy production for individual trajectories in a coarse-grained description under time-dependent driving, demonstrated on an experimentally verified protein unfolding process and yielding a bound on the distribution of the physical entropy production of individual unfolding events.<sup>[6](https://www.pnas.org/doi/abs/10.1073/pnas.2405371121)</sup> In December 2025 he posted a systematic review of model-free lower bounds on entropy production from coarse-grained data, covering bounds based on coarse-grained states, fluctuating currents, correlation functions, and waiting-time distributions between Markovian events.<sup>[7](https://arxiv.org/html/2512.07772)</sup> A further paper appeared in Physical Review E 113, 014119 in 2026.<sup>[14](https://www.itp2.uni-stuttgart.de/publications/)</sup>

## Representative work

- **"Entropy Production along a Stochastic Trajectory and an Integral Fluctuation Theorem"**, *Physical Review Letters* (2005), [doi:10.1103/physrevlett.95.040602](https://doi.org/10.1103/physrevlett.95.040602).

## References

1. [Prof. Dr. Udo Seifert, II. Institute for Theoretical Physics, University of Stuttgart](https://www.itp2.uni-stuttgart.de/institute/teamlist/Seifert-00001/)
2. [Front matter, Stochastic Thermodynamics, Cambridge University Press](https://assets.cambridge.org/97813165/19554/frontmatter/9781316519554_frontmatter.pdf)
3. [Entropy Production along a Stochastic Trajectory and an Integral Fluctuation Theorem, Physical Review Letters 95, 040602 (2005)](https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.95.040602)
4. [Stochastic thermodynamics, fluctuation theorems and molecular machines, Reports on Progress in Physics 75, 126001 (2012)](https://iopscience.iop.org/article/10.1088/0034-4885/75/12/126001)
5. [Stochastic Thermodynamics, Cambridge University Press](https://www.cambridge.org/core/books/stochastic-thermodynamics/1766FFBF10FCC7A75DAA89C6E09ED0AB)
6. [General theory for localizing the where and when of entropy production meets single-molecule experiments, PNAS (2024)](https://www.pnas.org/doi/abs/10.1073/pnas.2405371121)
7. [Universal bounds on entropy production from fluctuating coarse-grained trajectories, arXiv 2512.07772 (2025)](https://arxiv.org/html/2512.07772)
8. [Fluid membranes: theory of vesicle conformations, habilitation thesis record, University of Stuttgart OPUS](https://doi.org/10.18419/opus-8858)
9. [DFG GEPRIS: Professor Dr. Udo Seifert](https://gepris.dfg.de/person/1816140)
10. [Stochastic thermodynamics: Principles and perspectives, arXiv 0710.1187 (2007)](https://ar5iv.labs.arxiv.org/html/0710.1187)
11. [Verhandlungen der Deutschen Physikalischen Gesellschaft, 2023: Stochastic thermodynamics: From concepts to model-free inference](https://www.dpg-verhandlungen.de/year/2023/conference/skm/part/plv/session/4/contribution/1)
12. [From Stochastic Thermodynamics to Thermodynamic Inference, Annual Review of Condensed Matter Physics 10, 171–192 (2019)](https://www.annualreviews.org/content/journals/10.1146/annurev-conmatphys-031218-013554)
13. [Inference and localization of entropy production beyond the thermodynamic uncertainty relation, Nordita workshop slides (October 2024)](https://indico.fysik.su.se/event/8135/contributions/13870/attachments/5972/7818/stockholm24.pdf)
14. [Publications, II. Institute for Theoretical Physics, University of Stuttgart](https://www.itp2.uni-stuttgart.de/publications/)

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*Topic: Encyclopedia › Physical world and mathematics › Physical and mathematical scientists › Physicists and astronomers › Researchers in soft matter, statistical physics, and biological physics › Active matter and nonequilibrium statistical physics*

*Initially written Sep 21, 2026 · Reviewed: Sep 25, 2026 · Edited: Sep 25, 2026; Oct 15, 2026 · Last review: Sep 25, 2026*

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