Welcome to my website!

Lars Söderholm
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I am associate professor (universitetslektor) at the Department of Mechanics, KTH, Stockholm, Sweden.
Docent in Theoretical Physics, University of Stockholm. 


My area of research comprises the kinetic theory of gases, continuum mechanics and relativity. 

My recent work is in non-Newtonian phenomena and the kinetic theory of gases . It concerns the area of gases, where the Knudsen number (or mean free path) is so large that the Navier-Stokes equations do not apply, but still small enough that a modified continuum description is possible.

Recently, I have also done some work on nonlinear acoustics, in particular in the study of higher order nonlinearities than those taken into account in the Burgers and Kuznetsov equations. 

I am also working in the relativistic theory of fluid dynamics. For ideal fluids, the situation is quite clear, but for dissipative fluids it is not at present well understood. Relativistic kinetic theory of gases gives a possibility to approach these questions.

The cm-package by Mikael Eriksson and Lars Söderholm is a Maple program for the calculation of tensor fields in arbitrary coordinates in continuum mechanics. It is based on the mapping from reference configuration to present configuration and can handle also two-point tensors like the first Piola-Kirchhoff stress tensor and the deformation  gradient.
It was developed as a Master thesis by Mikael Eriksson.

New: Master Thesis Project

Graduate student: Karl Borg.


Continuum mechanics courses

Continuum mechanics  A fourth year undergraduate course;

General Continuum Mechanics,  is a somewhat extended version of the undergraduate course, which is intended for students who did not take continuum mechanics on the undergraduate level)

Advanced continuum mechanics is a new graduate course. It was given in spring 1999 for the first time.

Mathematical methods of mechanics

This course consists of regular and singular perturbation theory applied to ordinary differential equations, in particular linear and nonlinear oscillations and Green function methods, the method of stationary phase and methods of characteristics applied to linear and nonlinear waves.

Nonlinear Dynamics in Mechanics



Relativity course

 Relativistic continuum mechanics

Kinetic theory of gases

Physics of gases (within the graduate course on fluid dynamics). 

Basic course


A recent popular paper (in Swedish).

The Enskog HeritageA minisymposium which took place in September 1997

A useful link in mechanics is to the IUTAM Newsletter.
(IUTAM is the International Union of Theoretical and Applied Mechanics).
The latest in non-linear sciences.
A useful link in relativity is General Relativity in Sweden.
Physics News

You can reach me by e-mail at: lars.soderholm@mech.kth.se

My address. 


Five pictures from KTH














Art inauguration





Wet weather

Poems (in Swedish)

1   2  3
A new poem, spring 2003







Last updated March 2007.