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Non-perturbative Renormalization Group Approach to Some Out-of-Equilibrium Systems

Diffusive Epidemic Process and Fully Developed Turbulence

  • Book
  • © 2020

Overview

Authors:
  1. Malo Tarpin

    1. Institut für Theoretische Physik der Universität Heidelberg, Heidelberg, Germany

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  • Nominated as an outstanding PhD thesis by the University of Grenobles Alpes
  • A valuable contribution to our understanding of critical stationary states in out-of-equilibrium systems
  • Presents new mathematical insights including exact analytical descriptions of physically relevant regimes

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (6 chapters)

  1. Front Matter

    Pages i-xv
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  2. General Introduction

    • Malo Tarpin
    Pages 1-5

  3. Universal Behaviors in the Diffusive Epidemic Process and in Fully Developed Turbulence

    • Malo Tarpin
    Pages 7-44

  4. Introduction to Non-perturbative Renormalization Group for Out-of-Equilibrium Field Theories

    • Malo Tarpin
    Pages 45-77

  5. Study of the Absorbing Phase Transition in DEP

    • Malo Tarpin
    Pages 79-109

  6. Breaking of Scale Invariance in Correlation Functions of Turbulence

    • Malo Tarpin
    Pages 111-140

  7. General Conclusion

    • Malo Tarpin
    Pages 141-144

  8. Back Matter

    Pages 145-207
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Keywords

About this book

This thesis presents the application of non-perturbative, or functional, renormalization group to study the physics of critical stationary states in systems out-of-equilibrium. Two different systems are thereby studied. The first system is the diffusive epidemic process, a stochastic process which models the propagation of an epidemic within a population. This model exhibits a phase transition peculiar to out-of-equilibrium, between a stationary state where the epidemic is extinct and one where it survives. The present study helps to clarify subtle issues about the underlying symmetries of this process and the possible universality classes of its phase transition. The second system is fully developed homogeneous isotropic and incompressible turbulence. The stationary state of this driven-dissipative system shows an energy cascade whose phenomenology is complex, with partial scale-invariance, intertwined with what is called intermittency. In this work, analytical expressions for the space-time dependence of multi-point correlation functions of the turbulent state in 2- and 3-D are derived. This result is noteworthy in that it does not rely on phenomenological input except from the Navier-Stokes equation and that it becomes exact in the physically relevant limit of large wave-numbers. The obtained correlation functions show how scale invariance is broken in a subtle way, related to intermittency corrections.

Authors and Affiliations

  • Institut für Theoretische Physik der Universität Heidelberg, Heidelberg, Germany

    Malo Tarpin

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