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Critical mass renormalization in renormalized phi4 theories in two and three dimensions
Andrea Pelissetto, Ettore Vicari
We consider the O(N)-symmetric phi4 theory in two and three dimensions and determine the nonperturbative mass renormalization needed to obtain the phi4 continuum theory. The requir…
A large N phase transition in the continuum two dimensional SU(N) X SU(N) principal chiral model
R. Narayanan, H. Neuberger, E. Vicari
It is established by numerical means that the continuum large N principal chiral model in two dimensions has a phase transition in a smoothed two point function at a critical dista…
Theta dependence of SU(N) gauge theories in the presence of a topological term
Ettore Vicari, Haralambos Panagopoulos
We review results concerning the theta dependence of 4D SU(N) gauge theories and QCD, where theta is the coefficient of the CP-violating topological term in the Lagrangian. In part…
High-order perturbative expansions of multi-parameter Phi^4 quantum field theories
Andrea Pelissetto, Ettore Vicari
We present high-order pertubative expansions of multi-parameter Phi^4 quantum field theories with an N-component fundamental field, containing up to 4th-order polynomials of the fi…
The spectrum of SU(N) gauge theories at nonzero theta
Luigi Del Debbio, Gian Mario Manca, Haralambos Panagopoulos +2
We study the theta dependence of the spectrum of four-dimensional SU(N) gauge theories, where theta is the coefficient of the topological term in the Lagrangian, for N>=3 and in th…
Theta-dependence of the spectrum of SU(N) gauge theories
Luigi Del Debbio, Gian Mario Manca, Haralambos Panagopoulos +2
We study the theta dependence of the spectrum of four-dimensional SU(N) gauge theories, where theta is the coefficient of the topological term in the Lagrangian, for N>=3 and in th…
Quantum Field Theories and Critical Phenomena on Defects
Davide Fichera, Mihail Mintchev, Ettore Vicari
We construct and investigate quantum fields induced on a d-dimensional dissipationless defect by bulk fields propagating in a (d+1)-dimensional space. All interactions are localize…
The finite-temperature chiral transition in QCD with adjoint fermions
Francesco Basile, Andrea Pelissetto, Ettore Vicari
We study the nature of the finite-temperature chiral transition in QCD with N_f light quarks in the adjoint representation (aQCD). Renormalization-group arguments show that the tra…
Interacting N-vector order parameters with O(N) symmetry
Andrea Pelissetto, Ettore Vicari
We consider the critical behavior of the most general system of two N-vector order parameters that is O(N) invariant. We show that it may a have a multicritical transition with enl…
Topological susceptibility of SU(N) gauge theories at finite temperature
Luigi Del Debbio, Haralambos Panagopoulos, Ettore Vicari
We investigate the large-N behavior of the topological susceptibility in four-dimensional SU(N) gauge theories at finite temperature, and in particular across the finite-temperatur…
Field-theory results for three-dimensional transitions with complex symmetries
Pasquale Calabrese, Andrea Pelissetto, Paolo Rossi +1
We discuss several examples of three-dimensional critical phenomena that can be described by Landau-Ginzburg-Wilson theories. We present an overview of field-theoretical resu…
Theta dependence of SU(N) gauge theories
Luigi Del Debbio, Haralambos Panagopoulos, Ettore Vicari
We study the dependence of four-dimensional SU() gauge theories, for and in the large-N limit. We use numerical simulations of the Wilson lattice formulation of ga…
Spectrum of confining strings in SU(N) gauge theories
Luigi Del Debbio, Haralambos Panagopoulos, Paolo Rossi +1
We study the spectrum of the confining strings in four-dimensional SU(N) gauge theories. We compute, for the SU(4) and SU(6) gauge theories formulated on a lattice, the string tens…
k-string tensions in SU(N) gauge theories
Luigi Del Debbio, Haralambos Panagopoulos, Paolo Rossi +1
In the context of four-dimensional SU(N) gauge theories, we study the spectrum of the confining strings. We compute, for the SU(6) gauge theory formulated on a lattice, the three i…
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.…
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…
Critical Behavior of Simplicial Chiral Models
R. C. Brower, M. Campostrini, K. Orginos +3
The large-N saddle-point equations for the principal chiral models defined on a d-1 dimensional simplex are derived from the external field problem for unitary integrals. The saddl…