Vidushi Maillart
(University of Bern and Regensburg)
15/06/2010, 17:00
Theoretical developments
We study the lattice O(N) Gross-Neveu model with Wilson fermions in the
loop gas formulation. Employing the Prokof'ev-Svistunov worm algorithm
we can simulate fluctuating fermionic boundary conditions and use them
to tune the system exactly to the critical point. We show how the worm
algorithm can be extended to sample directly the correlation functions
of fermion bound states involving...
David Baumgartner
(University of Bern)
15/06/2010, 17:20
Theoretical developments
We discuss the formulation of supersymmetric quantum mechanics on the lattice as an interacting gas of bosonic and fermionic loops and its simulation using the Prokof'ev-Svistunov worm algorithm. In the case
of unbroken supersymmetry we can simulate different lattice discretisations, including Q-exact actions, in the weak and strong coupling regime, and we find that the expected mass...
Urs Wenger
(Institute for Theoretical Physics, University of Bern)
15/06/2010, 17:40
Theoretical developments
We review the construction of twisted supersymmetry and Q-exact
actions on the lattice in low dimensions and discuss the formulation
of such supersymmetric lattice models as an interacting gas of bosonic
and fermionic loops. We comment on the relevance of the fermion sign
problem for the vanishing of the Witten index and show how this sign
problem can be solved by employing the...
