Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-06-22
Physics
High Energy Physics
High Energy Physics - Theory
7 pages, 4 figures, Talk presented by J. Nishimura at the 21st Nishinomiya-Yukawa Memorial Symposium on Theoretical Physics:
Scientific paper
10.1143/PTPS.171.178
We study U(1) gauge theory on a 4d non-commutative torus, where two directions are non-commutative. Monte Carlo simulations are performed after mapping the regularized theory onto a U(N) lattice gauge theory in d=2. At intermediate coupling strength, we find a phase in which open Wilson lines acquire non-zero vacuum expectation values, which implies the spontaneous breakdown of translational invariance. In this phase, various physical quantities obey clear scaling behaviors in the continuum limit with a fixed non-commutativity parameter theta, which provides evidence for a possible continuum theory. In the weak coupling symmetric phase, the dispersion relation involves a negative IR-singular term, which is responsible for the observed phase transition.
Bietenholz Wolfgang
Nishimura Jun
Susaki Yoshiaki
Volkholz Jan
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