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Critical limit and anisotropy in the two-point correlation function of three-dimensional O(N) models
Massimo Campostrini, Andrea Pelissetto, Paolo Rossi +1
In three-dimensional O(N) models, we investigate the low-momentum behavior of the two-point Green's function G(x) in the critical region of the symmetric phase. We consider physica…
Topological charge on the lattice: a field theoretical view of the geometrical approach
Leonardo Rastelli, Paolo Rossi, Ettore Vicari
We construct sequences of ``field theoretical'' (analytical) lattice topological charge density operators which formally approach geometrical definitions in 2-d models a…
The large-N expansion of unitary-matrix models
Paolo Rossi, Massimo Campostrini, Ettore Vicari
The general features of the 1/N expansion in statistical mechanics and quantum field theory are briefly reviewed both from the theoretical and from the phenomenological point of vi…
Decorrelating the topology in full QCD
G. Boyd, B. Allés, M. D'Elia +2
We investigate the performance of the hybrid Monte Carlo algorithm in updating non-trivial global topological structures. We find that the hybrid Monte Carlo algorithm has serious…
Hybrid Monte Carlo and topological modes of full QCD
B. Allés, G. Boyd, M. D'Elia +2
We investigate the performance of the hybrid Monte Carlo algorithm, the standard algorithm used for lattice QCD simulations involving fermions, in updating non-trivial global topol…
Critical behavior of the correlation function of three-dimensional O(N) models in the symmetric phase
Massimo Campostrini, Paolo Rossi, Andrea Pelissetto +1
We present new strong-coupling series for O(N) spin models in three dimensions, on the cubic and diamond lattices. We analyze these series to investigate the two-point Green's func…
Classical improvement of lattice actions and quantum effects: a unified view
Paolo Rossi, Ettore Vicari
The possibility of removing the one-loop perturbative effects of lattice artifacts by a proper choice of the lattice action is explored, and found to depend crucially on the proper…
A strong-coupling analysis of two-dimensional O(N) sigma models with N<=2 on square, triangular and honeycomb lattices
Massimo Campostrini, Andrea Pelissetto, Paolo Rossi +1
The critical behavior of two-dimensional models with on the square, triangular, and honeycomb lattices is investigated by an analysis of the strong-coupl…
A strong-coupling analysis of two-dimensional O(N) sigma models with on square, triangular and honeycomb lattices
Massimo Campostrini, Andrea Pelissetto, Paolo Rossi +1
Recently-generated long strong-coupling series for the two-point Green's functions of asymptotically free lattice models are analyzed, focusing on the evaluation o…