56 citations · 804 across the 77 of their papers we have counts for
72 papers · 1 filter
Spectral density of the Dirac-Ginsparg-Wilson operator, chiral anomaly, and analyticity in the high temperature phase of
Vicente Azcoiti
Using general properties of the topological sector we previously argued that a vector-like theory, with chiral anomaly, and exact non-Abelian chiral symmetry, should…
Axial Anomaly: a New Mechanism to Generate Massless Bosons
Vicente Azcoiti
Prior to the establishment of as the correct theory describing hadronic physics, it was realized that the essential ingredients of the hadronic world at low energies are chir…
Interplay between chiral symmetry, axial anomaly and massless bosons
Vicente Azcoiti
The standard wisdom on the origin of massless bosons in the spectrum of a Quantum Field Theory describing the interaction of gauge fields coupled to matter fields is based…
Topology in the chiral symmetry restored phase of unquenched QCD and axion cosmology
Vicente Azcoiti
The axion is one of the more interesting candidates to make the dark matter of the universe, and the axion potential plays a fundamental role in the determination of the dynamics o…
Massive Schwinger model at finite
Vicente Azcoiti, Giuseppe Di Carlo, Eduardo Follana +2
Using the approach developed in [V. Azcoiti, G. Di Carlo, A. Galante, V. Laliena, \textit{Phys. Lett.} \textbf{B563}, (2003) 117], we are able to reconstruct the behavior of the ma…
Topology in the SU(N_f) chiral symmetry restored phase of unquenched QCD and axion cosmology II
Vicente Azcoiti
We investigate the physical consequences of the survival of the effects of the U(1)_A anomaly in the chiral symmetric phase of QCD, and show that the free energy density is a singu…
Antiferromagnetic Ising model in an imaginary magnetic field
Vicente Azcoiti, Giuseppe Di Carlo, Eduardo Follana +1
We study the two-dimensional antiferromagnetic Ising model with a purely imaginary magnetic field, which can be thought of as a toy model for the usual physics. Our motivation…
Topology in the SU(Nf) chiral symmetry restored phase of unquenched QCD and axion cosmology
Vicente Azcoiti
We investigate the topological properties of unquenched on the basis of numerical results of simulations at fixed topological charge, recently reported by Borsanyi et al.. We…
Topological Index Theorem on the Lattice through the Spectral Flow of Staggered Fermions
V. Azcoiti, G. Di Carlo, E. Follana +1
We investigate numerically the spectral flow introduced by Adams for the staggered Dirac operator on realistic (quenched) gauge configurations. We obtain clear numerical evidence t…
and Antiferromagnetic Ising Model with topological term at
Vicente Azcoiti, Gennaro Cortese, Eduardo Follana +1
We study the two and three-dimensional Antiferromagnetic Ising Model with an imaginary magnetic field at . We use a new geometric algorithm which does not present a sign…
A Geometric Monte Carlo Algorithm for the Antiferromagnetic Ising model with "Topological" Term at
V. Azcoiti, G. Cortese, E. Follana +1
In this work we study the two and three-dimensional antiferromagnetic Ising model with an imaginary magnetic field at . In order to perform numerical simulations of the s…
Phase structure of a generalized Nambu Jona-Lasinio model with Wilson fermions in the mean field or large -expansion
V. Azcoiti, G. Di Carlo, E. Follana +2
We analyze the vacuum structure of a generalized lattice Nambu--Jona-Lasinio model with two flavors of Wilson fermions, such that its continuum action is the most general four-ferm…
Geometric representation of the 2D Antiferromagnetic Ising Model with topological term at θ=π
V. Azcoiti, G. Cortese, E. Follana +1
We study the two-dimensional Antiferromagnetic Ising Model with an imaginary magnetic field iθat θ=π. We use a new geometric algorithm which does not present a sign problem. This a…
Elucidating the Vacuum Structure of the Aoki Phase
Vicente Azcoiti, Giuseppe Di Carlo, Eduardo Follana +1
In this paper, we discuss the vacuum structure of QCD with two flavors of Wilson fermions, inside the Aoki phase. We provide numerical evidence, coming from HMC simulations in $4^4…
Critical behaviour of the O(3) nonlinear sigma model with topological term at theta=pi from numerical simulations
Vicente Azcoiti, Giuseppe Di Carlo, Eduardo Follana +1
We investigate the critical behaviour at theta=pi of the two-dimensional O(3) nonlinear sigma model with topological term on the lattice. Our method is based on numerical simulatio…
Spectral Flow and Index Theorem for Staggered Fermions
E. Follana, V. Azcoiti, G. Di Carlo +1
We investigate numerically the spectral flow introduced by Adams for the staggered Dirac operator on realistic gauge configurations. We study both the unimproved and the HISQ Dirac…
Progress in numerical simulations of systems with a vacuum like term: The two and three-dimensional Ising model within an imaginary magnetic field
Vicente Azcoiti, Eduardo Follana, Alejandro Vaquero
Using the approach developed in \cite{REFVIC2}, we succeeded in reconstructing the behaviour of the antiferromagnetic Ising model with imaginary magnetic field for two and thr…
The Aoki phase revisited
V. Azcoiti, G. Di Carlo, E. Follana +1
In order to elucidate the vacuum structure of the Aoki phase, we carried out a numerical investigation of QCD with two flavours of Wilson fermions, within the p.d.f. framework and…
Parity Realization in Lattice QCD with Ginsparg-Wilson Fermions
V. Azcoiti, G. Di Carlo, E. Follana +1
The Vafa-Witten arguments on the realization of parity and flavour symmetries in the QCD vacuum do not apply to two lattice regularizations of QCD which are able to reproduce the c…
Understanding the Aoki phase
V. Azcoiti, G. Di Carlo, E. Follana +1
The vacuum structure of QCD with two degenerated flavours of Wilson fermions is discussed by means of the p.d.f. (probability distribution function) formalism. Under certain assump…
QCD with two flavors of Wilson fermions: The QCD vacuum, the Aoki vacuum and other vacua
V. Azcoiti, G. Di Carlo, A. Vaquero
We discuss the vacuum structure of QCD with two flavors of Wilson fermions. We derive two possible scenarios: (i) If the spectral density of the overlap hamiltonian in a…
Critical Behavior of CP^1 at theta = pi, Haldane's Conjecture and the Universality Class
V. Azcoiti, G. Di Carlo, A. Galante
Using an approach to analyze the theta dependence of systems with a theta-term we recently proposed, the critical behavior of CP^1 at theta=pi is studied. We find a region outside…
Phase structure of four flavor QCD in the T μplane from a new method for simulations of lattice gauge theories at non zero baryon density
Vicente Azcoiti, Giuseppe Di Carlo, Angelo Galante +1
We review a method for numerical simulations of lattice gauge theories at non-zero baryonic chemical potential we recently proposed. We first report on a test of the method using a…
Phase diagram of QCD with four quark flavors at finite temperature and baryon density
Vicente Azcoiti, Giuseppe Di Carlo, Angelo Galante +1
We analyze the phase diagram of QCD with four staggered flavors in the (mu, T) plane using a method recently proposed by us. We explore the region T > 0.7 Tc and mu <1.4 Tc, where…