###### Inhaltsbereich

# F, T6: Self-organisation and nonequilibrium physics – Overview

## Lecturer

## Organization of the Lecture

The lecture takes place on:

- Wednesday, 10:00 c.t. - 12:00,
- Thursday, 10:00 c.t. - 12:00,

starting on 17.04.2024.

Credits: 4 SWS lecture + 2 SWS exercise class, 9 ECTS

More detailed information and all relevant course material will be shared on **Moodle [course link]**. The key to enroll in the Moodle course will be sent out via email to all participants registered in the LSF after the first lecture, so please register there in advance:

If there are problems or questions regarding the organization of the lecture, please contact Florian Raßhofer ( Florian.Rasshofer@physik.uni-muenchen.de ).

## Central tutorial:

- Wednesdays from 14:00 c.t.—16:00, A348 (Theresienstr. 37)

There will be no central tutorial in the first week of lectures. The first central tutorial takes place on 24.04.2024.

For more information about the central tutorial, please check the Moodle page.

## Overview of Lecture Content

How would one design a physical theory of the processes in a living cell, the collective dynamics of a group of interacting agents (cells, organisms), or other complex systems such as financial markets? Is this even possible given the "complexity" of these systems? Despite the obvious differences between the constituents of these systems (proteins, cells, financial brokers, ...), are there some common principles underlying the emergent behaviour of these systems at the system level? Does "complex" necessarily mean "too complicated", so that any attempt to design a physical theory is doomed to failure?

There is a way to understand these systems if you approach them with the right perspective and ask the right questions. The big challenge is to find ways to describe the tendency of these systems to "self-organize" or "self-assemble" into complex structures or to explain the emergence of spatio-temporal patterns. In this set of lectures, I will give an introduction to this area of complex systems and discuss new conceptual frameworks that show how these systems can be understood in a unified way, as well as some of the essential mathematical and computational tools.

The main themes of the lecture will be:

- Phase space analysis: a unifying geometric view of system dynamics (flows, fixed points, attractors, stability, excitability, synchronization, catastrophes, bifurcations, chaos)
- Pattern formation and self-organisation: a physical theory of spatially extended systems (phase separation, interface dynamics, reaction-diffusion systems, fronts and waves, neuronal networks, collective phenomena, active systems, hydrodynamic instabilities, turbulence)
- Non-equilibrium dynamics and self-assembly: broken detailed balance and its consequences (non-equilibrium steady states and phase transitions, generic scale invariance, self-assembly)

There are lecture notes for the first part of the lecture already available to download at ArXiv:2012.01797. This is based on a set of lectures that I gave at a Les Houches Summer School in 2018. In addition, the ideas of nonlinear dynamics can be applied to evolutionary game theory; see Physica A 389 (2010) 4265–4298.