Ettore Vicari

TL;DR: In this paper, the authors consider the two-dimensional uniformly frustrated XY model in the limit of small frustration, which is equivalent to an XY system, for instance a Josephson junction array in a weak uniform magnetic field applied along a direction orthogonal to the lattice, and show that the uniform frustration destabilizes the line of fixed points which characterize the critical behavior of the XY model for T ≤ TKT.

TL;DR: In this paper, the on-shell proton matrix element of the topological charge density in the quenched approximation was computed on the lattice and the spin content of the proton was computed.

TL;DR: In this article, a detailed study of the finite one-dimensional quantum Ising chain in a transverse field in the presence of boundary magnetic fields coupled with the order-parameter spin operator is presented.

TL;DR: For operators in lattice gauge theories linear in the link variables, this article proposed improved estimators, obtained from a microcanonical integration of statistically independent links, and compared the method with the canonical integration based on the multihit technique.

TL;DR: In this paper, the authors report progress in the computation and analysis of strong-coupling series of two-and three-dimensional models, and they show that, through a combination of long strong coupling series and judicious choice of observables, one can compute continuum quantities reliably and with a precision at least comparable with the best available Monte Carlo data.