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SS19 – Abstract
Christof Gattringer
(Graz)
25.4.2019
Lattice field theory with worldlines and worldsheets (PRETALK for students at 15:30 h)
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.
