3 papers
cond-mat.stat-mech2004
Harmonic crossover exponents in O(n) models with the pseudo-epsilon expansion approach
Pasquale Calabrese, Pietro Parruccini
We determine the crossover exponents associated with the traceless tensorial quadratic field, the third- and fourth-harmonic operators for O(n) vector models by re-analyzing the ex…
cond-mat.stat-mech2003
Critical thermodynamics of three-dimensional chiral model for N > 3
P. Calabrese, P. Parruccini, A. I. Sokolov
The critical behavior of the three-dimensional -vector chiral model is studied for arbitrary . The known six-loop renormalization-group (RG) expansions are resummed using the…
cond-mat.stat-mech2002
On the evaluation of the improvement parameter in the lattice Hamiltonian approach to critical phenomena
Massimo Campostrini, Pietro Parruccini, Paolo Rossi
In lattice Hamiltonian systems with a quartic coupling , a critical value may exist such that, when , the leading irrelevant operator decouples from the Hamiltonian…