Simulations in full QCD are extremely slow, and are still carried out far from the continuum limit. A possible solution for this problem is the use of improved actions, for which the simulation gives the continuum limit at higher values of the cutoff a, reducing computational costs. An important step in the improvement program was taken recently by the Alpha collaboration, with the nonperturbat...

A fourth-order nonlinear evolution equation is derived from a microscopic model for surface diffusion, namely, the continuum solid-on-solid model. We use the method developed by Varadhan for the computation of the hydrodynamic scaling limit of nongradient models. What distinguishes our model from other models discussed so far is the presence of two conservation laws for the dynamics in a nonper...

We investigate the continuum limit of the low lying static-light meson spectrum using Wilson twisted mass lattice QCD with Nf = 2 dynamical quark flavours. We consider three values of the lattice spacing a ≈ 0.051 fm , 0.064 fm , 0.080 fm and various values of the pion mass in the range 280MeV ∼mPS ∼ 640MeV. We present results in the continuum limit for light cloud angular momentum j = 1/2 , 3/...

We investigate the continuum limit of the gauge-ball spectrum in the four-dimensional pure U(1) lattice gauge theory. In the confinement phase we identify various states scaling with the correlation length exponent ν ≃ 0.35. The square root of the string tension also scales with this exponent, which agrees with the non-Gaussian fixed point exponent recently found in the finite size studies of t...