56 citations · 388 across the 40 of their papers we have counts for
39 papers · 1 filter
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…
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…
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…
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…
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…
New proposal for numerical simulations of systems with a theta-vacuum term
Vicente Azcoiti, Giuseppe Di Carlo, Angelo Galante +1
A new approach to perform numerical simulations of systems with a theta-vacuum term is proposed, tested, and applied to CP3 The main new ingredient of this approach is the method u…
New proposal for numerical simulations of theta-vacuum like systems
Vicente Azcoiti, Giuseppe Di Carlo, Angelo Galante +1
We propose a new approach to perform numerical simulations of theta-vacuum like systems, test it in two analytically solvable models, and apply it to CP^3. The main new ingredient…
Probability Distribution Function of the Diquark Condensate in Two Colours QCD
R. Aloisio, V. Azcoiti, G. Di Carlo +2
We consider diquark condensation in finite density lattice SU(2). We first present an extension of Vafa-Witten result, on spontaneous breaking of vector-like global symmetries, tha…
Fermion Condensates in Two Colours Finite Density QCD at Strong Coupling
R. Aloisio, V. Azcoiti, G. Di Carlo +2
We study unquenched lattice SU(2) at nonzero chemical potential at strong coupling and with eight flavours of Kogut-Susskind fermions. Introducing a diquark source term we analyze…
Numerical study of the scaling properties of SU(2) lattice gauge theory in Palumbo non-compact regularization
Giuseppe Di Carlo, Roberto Scimia
In the framework of a non-compact lattice regularization of nonabelian gauge theories we look, in the SU(2) case, for the scaling window through the analysis of the ratio of two ma…
Diquark condensation in two colour QCD
R. Aloisio, V. Azcoiti, G. Di Carlo +2
Unquenched lattice SU(2) is studied at nonzero chemical potential in the strong coupling limit. The topic of diquark condensation is addressed analyzing the probability distributio…
Three and Two Colours Finite Density QCD at Strong Coupling: A New Look
R. Aloisio, V. Azcoiti, G. Di Carlo +2
Simulations in finite density, beta=0 lattice QCD by means of the Monomer-Dimer-Polymer algorithm show a signal of first order transition at finite temporal size. This behaviour ag…
Strongly Coupled QCD at Finite Baryon Density
R. Aloisio, V. Azcoiti, G. Di Carlo +2
The analytical results obtained in the infinite mass and strong coupling limits of QCD are difficult to reconcile with the predictions of the Monomer Dimer Polymer algorithm. We ha…
Finite Density Fat QCD
R. Aloisio, V. Azcoiti, G. Di Carlo +2
Lattice formulation of Finite Baryon Density QCD is problematic from computer simulation point of view; it is well known that for light quark masses the reconstructed partition fun…
Rigorous arguments against current wisdoms in finite density QCD
R. Aloisio, V. Azcoiti, G. Di Carlo +2
QCD at finite chemical potential is analytically investigated in the region of large bare fermion masses. We show that, contrary to the general wisdom, the phase of the fermion det…
Finite density QCD with heavy quarks
R. Aloisio, V. Azcoiti, G. Di Carlo +2
In the large fermion mass limit of QCD at finite density the structure of the partition function greatly simplifies and can be studied analytically. We show that, contrary to gener…
Phase transition(s) in finite density QCD
R. Aloisio, V. Azcoiti, G. Di Carlo +2
The Grand Canonical formalism is generally used in numerical simulations of finite density QCD since it allows free mobility in the chemical potential . We show that special car…
Frustration in Finite Density QCD
R. Aloisio, V. Azcoiti, G. Di Carlo +2
We present a detailed analysis of the QCD partition function in the Grand Canonical formalism. Using the fugacity expansion we find evidence for numerical instabilities in the stan…
Investigation of a Toy Model for Frustration in Abelian Lattice Gauge Theory
V. Azcoiti, G. Di Carlo, E. Follana
We introduce a lattice model with local U(1) gauge symmetry which incorporates explicit frustration in d >2. The form of the action is inspired from the loop expansion of the fermi…
First Order Phase Transition in Finite Density QCD using the modulus of the Dirac Determinant
R. Aloisio, V. Azcoiti, G. Di Carlo +2
We report results of simulations of strong coupling, finite density QCD obtained within a MFA inspired approach where the fermion determinant in the integration measure is replaced…
Finite Density QCD in the Chiral Limit
R. Aloisio, V. Azcoiti, G. Di Carlo +2
We present the first results of an exact simulation of full QCD at finite density in the chiral limit. We have used a MFA (Microcanonical Fermionic Average) inspired approach for t…