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14 papers · 1 filter
Structure factor of dilute ring polymers
Pasquale Calabrese, Andrea Pelissetto, Ettore Vicari
We consider ring polymers in good solvents in the dilute limit. We determine the structure factor and the monomer-monomer distribution function. We compute accurately the asymptoti…
Critical structure factors of bilinear fields in O(N)-vector models
Pasquale Calabrese, Andrea Pelissetto, Ettore Vicari
We compute the two-point correlation functions of general quadratic operators in the high-temperature phase of the three-dimensional O(N) vector model by using field-theoretical me…
Discrete non-Abelian groups and asymptotically free models
Sergio Caracciolo, Andrea Montanari, Andrea Pelissetto
We consider a two-dimensional -model with discrete icosahedral/dodecahedral symmetry. Using the perturbative renormalization group, we argue that this model has a different cont…
Dynamic Critical Behavior of an Extended Reptation Dynamics for Self-Avoiding Walks
Sergio Caracciolo, Mauro Papinutto, Andrea Pelissetto
We consider lattice self-avoiding walks and discuss the dynamic critical behavior of two dynamics that use local and bilocal moves and generalize the usual reptation dynamics. We d…
Spin models on Platonic solids and asymptotic freedom
Sergio Caracciolo, Andrea Montanari, Andrea Pelissetto
We consider a two-dimensional sigma-model with discrete icosahedral/dodecahedral symmetry. We present high-precision finite-size numerical results that show that the continuum limi…
High-accuracy two-loop computation of the critical mass for Wilson fermions
Sergio Caracciolo, Andrea Pelissetto, Antonio Rago
We test an algebraic algorithm based on the coordinate-space method, evaluating with high accuracy the critical mass for Wilson fermions in lattice QCD at two loops. We test the re…
Critical exponents and equation of state of the three-dimensional Heisenberg universality class
M. Campostrini, M. Hasenbusch, A. Pelissetto +2
We improve the theoretical estimates of the critical exponents for the three-dimensional Heisenberg universality class. We find gamma=1.3960(9), nu=0.7112(5), eta=0.0375(5), alpha=…
Irrelevant operators in the two-dimensional Ising model
Michele Caselle, Martin Hasenbusch, Andrea Pelissetto +1
By using conformal-field theory, we classify the possible irrelevant operators for the Ising model on the square and triangular lattices. We analyze the existing results for the fr…
Chiral exponents in frustrated spin models with noncollinear ordering
Andrea Pelissetto, Paolo Rossi, Ettore Vicari
We compute the chiral critical exponents for the chiral transition in frustrated two- and three-component spin systems with noncollinear order, such as stacked triangular antiferro…
Two-loop critical mass for Wilson fermions
Sergio Caracciolo, Andrea Pelissetto, Antonio Rago
We have redone a recent two-loop computation of the critical mass for Wilson fermions in lattice QCD by evaluating Feynman integrals with the coordinate-space method. We present th…
Finite-Size Critical Behavior of the Driven Lattice Gas
Sergio Caracciolo, Andrea Gambassi, Massimiliano Gubinelli +1
We present a detailed Monte Carlo study of the high-temperature phase of the two-dimensional driven lattice gas at infinite driving field. We define a finite-volume correlation len…
Large-n Critical Behavior of O(n)xO(m) Spin Models
Andrea Pelissetto, Paolo Rossi, Ettore Vicari
We consider the Landau-Ginzburg-Wilson Hamiltonian with O(n)x O(m) symmetry and compute the critical exponents at all fixed points to O(n^{-2}) and to O(ε^3) in a ε=4-d expansion.…
Crossover phenomena in spin models with medium-range interactions and self-avoiding walks with medium-range jumps
S. Caracciolo, M. S. Causo, A. Pelissetto +2
We study crossover phenomena in a model of self-avoiding walks with medium-range jumps, that corresponds to the limit of an -vector spin system with medium-range intera…
Asymptotically free models and discrete non-Abelian groups
Sergio Caracciolo, Andrea Montanari, Andrea Pelissetto
We study the two-dimensional renormalization-group flow induced by perturbations that reduce the global symmetry of the O(3) sigma-model to the discrete symmetries of Platonic soli…