5 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…
The critical line from imaginary to real baryonic chemical potentials in two-color QCD
Paolo Cea, Leonardo Cosmai, Massimo D'Elia +1
The method of analytic continuation from imaginary to real chemical potentials is one of the few available techniques to study QCD at finite temperature and baryon density. One…
Numerical study of the mass spectrum in the 2D O(3) sigma model with a theta term
B. Alles, A. Papa
It has been conjectured that the mass spectrum of the O(3) non-linear sigma model with a theta term in 2 dimensions may possess an excited state, which decays when theta is lowered…
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…
Analytic continuation of the critical line in 2-color QCD at nonzero temperature and density
Paolo Cea, Leonardo Cosmai, Massimo D'Elia +1
We determine the pseudo-critical line in the temperature - chemical potential plane of 2-color QCD by direct Monte Carlo simulations and by analytic continuation from imaginary che…