4 papers
Numerical Evidence for the Haldane Conjecture
B. Alles, A. Papa
The Haldane conjecture, when applied to the Heisenberg O(3) model with a θterm in two dimensions, states that the correlation length ξdiverges when θapproaches π. To verify this co…
Mass gap in the 2D O(3) non-linear sigma model with a theta=pi term
B. Alles, A. Papa
By analytic continuation to real theta of data obtained from numerical simulation at imaginary theta we study the Haldane conjecture and show that the O(3) non-linear sigma model w…
Topology in QCD
G. Boyd, B. Alles, M. D'Elia +1
Topology on the lattice is reviewed. In quenched QCD topological susceptibility chi is fully understood. The Witten-Veneziano mechanism for the eta' mass is confirmed. The topologi…
New results on topological susceptibility in SU(3) gauge theory
B. Alles, G. Boyd, M. D'Elia +1
We survey recent lattice results on QCD topological properties. The behaviour of the topological susceptibility at the deconfining phase transition has been determined. This advanc…