title: Study of CP(N-1) theta-vacua by cluster simulation of SU(N) quantum spin ladders.
abstract: D-theory provides an alternative lattice regularization of the 2D CP(N-1) quantum field theory in which continuous classical fields emerge from the dimensional reduction of discrete SU(N) quantum spins. Spin ladders consisting of n transversely coupled spin chains lead to a CP(N-1) model with a vacuum angle theta=npi. In D-theory no sign problem arises and an efficient cluster algorithm is used to investigate theta-vacuum effects. At theta=pi there is a first order phase transition with spontaneous breaking of charge conjugation symmetry for CP(N-1) models with N>2.
authors.affiliation: Departments of Physics and Mechanical Engineering, Christian Brothers University, Memphis, TN 38104, USA.
authors.forename: B B
authors.initials: BB
authors.lastname: Beard
authors.forename: M
authors.initials: M
authors.lastname: Pepe
authors.forename: S
authors.initials: S
authors.lastname: Riederer
authors.forename: U-J
authors.initials: UJ
authors.lastname: Wiese