ITP |
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Teilchentee SS 2019
Seminar at the Institute for Theoretical Physics, Heidelberg University
on Thursdays, 4 pm
organizers: Juergen Berges and Joerg Jaeckel
Before each seminar, the speaker gives an informal Pre-Talk, introducing the MSc and PhD students at the ITP to the broader context of the topic of the seminar.
Pre-Talks start at 3:30 pm
Date: 25.4.2019
Speaker: Christof Gattringer
Title: Lattice field theory with worldlines and worldsheets
Abstract
In recent years many lattice field theories were exactly rewritten in terms of worldlines and worldsheets. Such a change of the degrees of freedom puts emphasis on different aspects of the theory. In particular some quantities such as the particle number or also theta terms appear as topological invariants (winding numbers) of the new degrees of freedom, and in several cases the transformation solves the complex action problem from such terms. In the talk we give an introduction to the newly developed techniques and discuss several examples of physical systems in the worldline- / worldsheet representation.
