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High-precision estimates of critical quantities by means of improved Hamiltonians
M. Campostrini, M. Hasenbusch, A. Pelissetto +2
Three-dimensional spin models of the Ising and XY universality classes are studied by a combination of high-temperature expansions and Monte Carlo simulations applied to improved H…
Nonanalyticity of the beta-function and systematic errors in field-theoretic calculations of critical quantities
M. Caselle, A. Pelissetto, E. Vicari
We consider the fixed-dimension perturbative expansion. We discuss the nonanalyticity of the renormalization-group functions at the fixed point and its consequences for the numeric…
High-precision estimate of g4 in the 2D Ising model
Michele Caselle, Martin Hasenbusch, Andrea Pelissetto +1
We compute the renormalized four-point coupling in the 2d Ising model using transfer-matrix techniques. We greatly reduce the systematic uncertainties which usually affect this typ…