W7. Fluctuations in Physics

Workshop organized by:
- F. Oliveira
- K.S. Olsen and F. Coghi


Section I

Fluctuation-Dissipation Theorem.

 F. Oliveira 

Although the relationship between fluctuations and dissipation, established in terms of the so-called fluctuation-dissipation theorem (FDT) and formulating links between nonequilibrium phenomena and time correlations of spontaneous fluctuations (at equilibrium), has been widely investigated over the past 50 years, some violations of that casual relation are still often found in literature and present controversial facets calling for further corrections and generalizations. As an example, in generic quantum systems, FDT has been recently shown to be directly related to quantum metrology in systems with non-equilibrium states.
Moreover, with the crescent abilities of experimentalists to work in small scales and at low temperatures those quantum versions of fluctuation-dissipation (FD) relations need to be better understood.

Section II

Fluctuations and First-Passage Problems: Theory and Applications

  K.S. Olsen and F. Coghi

In the last two/three decades, the study of nonequilibrium physical systems have played a major role in the theoretical physics community. In particular, it has been realized that remarkable signatures of nonequilibrium behavior are found in the
study of fluctuations of time-additive observables of these processes. Because of this, nowadays, much effort is drawn towards understanding whether general laws of nonequilibrium physical systems can be formalised with a proper theory of fluctuations. On the one hand, in equilibrium physics, this is possible thanks to the theory of large deviations which has been shown to be a rigorous way to formalise all our understanding of equilibrium system properties. On the other hand, in nonequilibrium physics, there is no conclusive answer yet, opening up to interesting studies.
This workshop focuses on a particular observable, namely the first-passage time, associated to physical processes. Remarkably, differently from time-additive observable, a full understanding of the fluctuations of the first-passage time still lacks (most of the results so far are focused on its mean properties). Nonetheless, it is common belief that first-passage times are excellent indicators of out-of-equilibrium behavior. Therefore, in order to fully understand nonequilibrium systems, it is of timely importance to develop a theory of fluctuations of first-passage times.
This workshop aims to bring together both experts and young researchers in the field to reflect on the current day status of fluctuations of first-passage times, as well as future directions and open problems. The topic of the workshop is certainly narrow, but we believe it is the best format for a short symposium, giving attendees clear problems to think about and discuss.
There are two main topics for the workshop;

(i) Fluctuations.

(ii) First-passage time problems.

During the 2/3 day program, there will be several talks covering these topics. There will also be room for discussion sessions that hopefully can foster new ideas and collaborations. To take full advantage of such discussion sessions, we encourage physical attendance at the SigmaPhi2023 premises in Crete (Greece), although talks and Q&A could in principle also be streamed. Furthermore, we strongly encourage diversity in the scientific panorama. Among the invited speakers, we have made an effort to include both theoreticians and experimentalists, female and male presenters, and to include both young and experienced researchers, all working in the field.


SigmaPhi 2023 Europhysics Conference

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Statistical and Nonlinear

Physics Division 

Politecnico di Torino




Roma, Italy


Technical University of

Crete Chania, Greece


Aristotele University of

Thessaloniki, Greece


N.C.S.R. Demokritos

Athens, Greece


University of Leuven


University of Cagliari



AFEA Company

Athens, Greece




MDPI publisher




edp Scince publisher