1. Anomalous Diffusion

Workshop organized by: S. Abe and J.P. Boon

 

This workshop will bring together experts who have developed various theoretical approaches for the analysis of Anomalous Diffusion and experimentalists who have explored and measured diffusive phenomena and reaction-diffuusion processes in particular in biological systems.


Diffusion is an ubiquitous phenomenon observed in physical, chemical, biological, social, algorithmic systems where "objects" (particles, molecules, cells, individuals, agents, ...) move in a seemingly random sequence of steps in such a way that their mean squared displacement increases linearly in time: <r^2>~t. However there are many instances where the "objects" do not move freely: obstacles, time delays, interactions can modify their trajectories such that the mean squared displacement deviates from the linear law. So more generally, one observes that the characteristic spatial scale varies like  l~t^(γ/2) where for normal diffusion γ=1 while if γ<>1 one talks about anomalous diffusion: when 0<γ<1 the process is said to be sub-diffusive and when γ>1 it is super-diffusive. As a result, there has been considerable interest in developing stochastic models capable of generating such behavior. Diverse microscopic dynamics can give rise to "diffusion" at the macroscopic level, but the underlying mechanisms may be quite different; for instance the distinction should be made between tracer motion where experimentally one follows trajectories of distinguishable particles seeded in an active medium and molecular diffusion where the motion of tagged particles, while identical to the medium particles, is made observable by radioactive or  fluorescent markers.
One class of diffusion models involves the use of memory. Non-Markovian dynamics is the mechanism behind the fractional Brownian motion and the use of correlated noise in the generalized Langevin equation leads to the fractional Fokker-Planck equation describing the phenomenology of anomalous diffusion in large ensembles and for single trajectories. On the other hand a Markovian random walk can also give rise to anomalous diffusion in a nonlinear formulation of the diffusion equation. A description of sub-diffusion based on non-Markovian models gives the fractional Fokker-Planck equation leading to a stretched-exponential distribution while the nonlinear theory gives algebraic power-law distributions. Both approaches have also been extended to the description of nonlinear reaction-diffusion systems. While in most studies the theories have been substantiated by numerical simulations, explicit comparisons between the theoretical results and experimental data are much scarcer. Therefore, new analytic developments in connection with experimental observations will be of considerable interest.

News

SigmaPhi Prizes

The SigmaPhi Prize for 2020 and SigmaPhi Prize for 2023 have been awarded during SigmaPhi2023 Conference to

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SigmaPhi Awards

During the conference, four works selected out of all the oral and poster presentations have been awarded.

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SigmaPhi 2023 Europhysics Conference

The European Physical Society (EPS) has recognized the SigmaPhi 2023 as Europhysics Conference.

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Workshops

W1. Quantum Physics and Machine Learning

Workshop organized by:F. Caruso

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W2. Data Science and Econophysics

Workshop organized by:P. Argyrakis

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W3. Complex Networks: Hidden Geometry and Dynamics

Workshop organized by:N. Gupte, M.M. Dankulov and B. Tadic

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W4. Climate and Environment

Workshop organized by:- D. Hristopulos - S. Blesic

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W5. Statistical physics of biophysical systems

Workshop organized by: A. Deutsch and B. Hatzikirou

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W6. Statistical physics methods for power grids

Workshop organized by:G. Odor and C. Beck

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W7. Fluctuations in Physics

Workshop organized by:F. Oliveira

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W8. Thermalization of Nonintegrable Many-Body Systems

Workshop organized by:S. Flach

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W9. Fifty years of the renormalization group

Workshop organized by:A. Aharony

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W10. Non-Extensive Statistical Mechanics and Kappa Distributions

Workshop organized by:G. Livadiotis, M. Leubner, P. Yoon and K. Dialynas

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Special Sessions

S1. Spin Glass Theory and Beyond

Special Session organized by E. Marinari and G. Parisi

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S2. Entropies and Correlations in Complex Systems

Special Session organized by V. Ilić, J. Korbel and S. Gupta

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S3. Holographic and other cosmologically relevant entropies

Special Session organized by P. Jizba and G. Lambiase

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S4. Quantum Long-Range Systems

Special Session organized by A. Trombettoni, S. Ruffo and D. Mukamel

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Scientific Sponsors 2023

 

Statistical and Nonlinear

Physics Division 

Politecnico di Torino

Italy

 

ISC - CNR

Roma, Italy

 

Technical University of

Crete Chania, Greece

 

Aristotele University of

Thessaloniki, Greece

 

N.C.S.R. Demokritos

Athens, Greece

 

University of Leuven

Belgium

University of Cagliari

Italy

 

AFEA Company

Athens, Greece

 

 

Entropy

MDPI publisher

 

 

EPJ B

edp Scince publisher

 

 

Springer publisher