Publications (64)
External Fields and Color Confinement
P. Cea, L. Cosmai
U(1), SU(2), and SU(3) lattice gauge theories in presence of external fields are investigated both in (3+1) and (2+1) dimensions. The free energy of gauge systems has been measured…
Dynamics of the Scalar Condensate in thermal 4D self-interacting Scalar Field Theory on the Lattice
P. Cea, M. Consoli, L. Cosmai
We simulate a four dimensional self-interacting scalar field theory on the lattice at finite temperature. By varying temperature, the system undergoes a phase transition from broke…
Lattice effective potential of : nature of the phase transition and bounds on the Higgs mass
P. Cea, L. Cosmai, M. Consoli +1
We present a detailed discussion of Spontaneous Symmetry Breaking (SSB) in . In the usual approach, inspired by perturbation theory, one predicts a second-order phase t…
A gauge invariant study of the monopole condensation in non Abelian lattice gauge theories
P. Cea, L. Cosmai
We investigate the Abelian monopole condensation in finite temperature SU(2) and SU(3) pure lattice gauge theories. To this end we introduce a gauge invariant disorder parameter bu…
Dynamics of Ferromagnetic Walls: Gravitational Properties
L. Campanelli, P. Cea, G. L. Fogli +1
We discuss a new mechanism which allows domain walls produced during the primordial electroweak phase transition. We show that the effective surface tension of these domain walls c…
Dual Meissner Effect and String Tension in SU(2) Lattice Gauge Theory
P. Cea, L. Cosmai
We study the distribution of the color fields due to a static quark-antiquark pair in SU(2) lattice gauge theory. We find that the London penetration length measured after Abelian…
Testing the Isotropy of the Universe with Type Ia Supernovae
L. Campanelli, P. Cea, G. L. Fogli +1
We analyze the magnitude-redshift data of type Ia supernovae included in the Union and Union2 compilations in the framework of an anisotropic Bianchi type I cosmological model and…
Generalized Gaussian Effective Potential: Low Dimensional Scalar Fields
P. Cea, L. Tedesco
We study a generalization of the Gaussian effective potential for self-interacting scalar fields in one and two spatial dimensions. We compute the two-loop corrections and discuss…
Analytical continuation from imaginary to real chemical potential in 2-color QCD under scrutiny
P. Cea, L. Cosmai, M. D'Elia +1
The method of analytical continuation from imaginary to real chemical potential is tested in 2-color QCD. In comparison to previous studies in the same theory, an exact updating al…
Hints for string breaking in QCD
P. Cea, V. Chelnokov, L. Cosmai +1
We present results for the chromo-electric field generated by a static quark-antiquark pair at nearly zero temperature in lattice QCD with 2+1 dynamical staggered fermions at physi…
Dynamical Symmetry Breaking in Planar QED
P. Cea, L. Tedesco
We investigate (2+1)-dimensional QED coupled with Dirac fermions both at zero and finite temperature. We discuss in details two-components (P-odd) and four-components (P-even) ferm…
Investigations on the deconfining phase transition in QCD
P. Cea, L. Cosmai, M. D'Elia
We investigate the deconfining phase transition in SU(3) pure gauge theory and in full QCD with two flavors of staggered fermions by means of a gauge invariant thermal partition fu…
The confining color field in SU(3) gauge theory
M. Baker, P. Cea, V. Chelnokov +3
We extend a previous numerical study of SU(3) Yang-Mills theory in which we measured the spatial distribution of all components of the color fields surrounding a static quark-antiq…
Lattice effective potential of massless : `triviality' and spontaneous symmetry breaking
P. Cea, M. Consoli, L. Cosmai +1
We present a precise lattice computation of the slope of the effective potential for massless theory in the region of bare parameters indicated by the Brahm's analysis…
Isolating the confining color field in the SU(3) flux tube
M. Baker, P. Cea, V. Chelnokov +3
Using lattice Monte Carlo simulations of SU(3) pure gauge theory, we determine the spatial distribution of all components of the color fields created by a static quark and antiquar…
Exploring the Dynamics of Three-Dimensional Lattice Gauge Theories by External Fields
P. Cea, L. Cosmai
We investigate the dynamics of three-dimensional lattice gauge theories by means of an external Abelian magnetic field. For the SU(2) lattice gauge theory we find evidence of the u…
Dual Superconductor Mechanism of Confinement on the Lattice
P. Cea, L. Cosmai
We investigate the dual superconductor mechanism of confinement for pure SU(2) lattice gauge theory in the maximally abelian gauge. We focus on the the dual Meissner effect. We fin…
Gravitational Field of Static Thin Planar Walls in Weak-Field Approximation
L. Campanelli, P. Cea, G. L. Fogli +1
We investigate gravitational properties of thin planar wall solutions of the Einstein's equations in the weak field approximation. We find the general metric solutions and discuss…
Large rescaling of the Higgs condensate: theoretical motivations and lattice results
P. Cea, M. Consoli, L. Cosmai
In the Standard Model the Fermi constant is associated with the vacuum expectation value of the Higgs field, `the condensate', usually believed to be a cutoff-independent quantity.…
The Trivial Higgs at LHC
P. Cea, L. Cosmai
We further elaborate on our proposal for the Trivial Higgs that within the Standard Model is the unique possibility to implement the spontaneous symmetry breaking of the local gaug…
The theory on the lattice: effective potential and triviality
A. Agodi, G. Andronico, P. Cea +2
We compute numerically the effective potential for the theory on the lattice. Three different methods were used to determine the critical bare mass for the chosen bare…
Analytic continuation in two-color QCD: new results on the critical line
P. Cea, L. Cosmai, M. D'Elia +1
We test the method of analytic continuation from imaginary to real chemical potential in two-color QCD, which is free from the sign problem. In particular, we consider the analytic…
Influence of the Magnetic Field on the Fermion Scattering off Bubble and Kink Walls
P. Cea, G. L. Fogli, L. Tedesco
We investigate the scattering of fermions off domain walls at the electroweak phase transition in presence of a magnetic field. We consider both the bubble wall and the kink domain…
Phase diagram of QCD with two degenerate staggered quarks
P. Cea, L. Cosmai, M. D'Elia +2
We present preliminary results about the critical line of QCD with two degenerate staggered quarks at nonzero temperature and chemical potential, obtained by the method of analytic…
(lambda Phi^4)_4 theory on the lattice: evidence for a non-trivial rescaling of the scalar condensate
P. Cea, M. Consoli, L. Cosmai
A lattice simulation in the broken phase of four-dimensional (lambda Phi^4) theory in the Ising limit suggests that, in the continuum limit, the scalar condensate rescales by a fac…
Large logarithmic rescaling of the scalar condensate: new lattice evidences
P. Cea, M. Consoli, L. Cosmai
Using two different methods, we have determined the rescaling of the scalar condensate near the critical line of a 4D Ising model. Our lattice data, in agreement wit…
Two-flavor QCD at finite quark or isospin density
P. Cea, L. Cosmai, M. D'Elia +2
We exploit analytic continuation to prolongate to the region of real chemical potentials the (pseudo)critical lines of QCD with two degenerate staggered fermions at nonzero tempera…
The Lattice Schrodinger Functional and the Background Field Effective Action
P. Cea, L. Cosmai, A. D. Polosa
We propose a new method that by using the lattice Schrödinger functional allows to investigate the effective action for external background fields in lattice gauge theories. We sh…
Ellipsoidal Universe Can Solve The CMB Quadrupole Problem
L. Campanelli, P. Cea, L. Tedesco
The recent three-year WMAP data have confirmed the anomaly concerning the low quadrupole amplitude compared to the best-fit ÎCDM prediction. We show that, allowing the large-scale…
New indications on the Higgs boson mass from lattice simulations
P. Cea, M. Consoli, L. Cosmai
The `triviality' of has been traditionally interpreted within perturbation theory where the prediction for the Higgs boson mass depends on the magnitude of the ultraviolet…
Lattice measurement of the energy-gap in a spontaneously broken phase
P. Cea, M. Consoli, L. Cosmai
Using lattice simulations of a one-component theory, we have measured the energy spectrum in the broken phase at various lattice sizes. Our data sho…
Abelian monopole condensation in lattice gauge theories
P. Cea, L. Cosmai
We investigate the dynamics of lattice gauge theories in an Abelian monopole background field. By means of the gauge-invariant lattice Schrodinger functional we study the Abelian m…
Lattice measurement of the scalar propagator near the symmetry breaking phase transition
P. Cea, M. Consoli, L. Cosmai
Recent lattice simulations of theories in the broken phase show that : a) the shifted field propagator is well reproduced by the simple 2-parameter form ${Z_{\rm prop}…
Unveiling the flux tube structure in full QCD
M. Baker, P. Cea, V. Chelnokov +2
We present lattice Monte Carlo results on the chromoelectric field created by a static quark-antiquark pair in the vacuum of QCD with 2+1 dynamical staggered fermions at physical m…
Flux tubes in QCD with (2+1) HISQ fermions
P. Cea, L. Cosmai, F. Cuteri +1
We investigate the transverse profile of the chromoelectric field generated by a quark-antiquark pair in the vacuum of (2+1) flavor QCD. Monte Carlo simulations are performed adopt…
Flux-tube structure in finite temperature QCD
M. Baker, P. Cea, V. Chelnokov +2
We present a study of the structure of the chromoelectrical field created by a static quark-antiquark pair in lattice QCD with 2+1 flavours of dynamical quarks, where the quark mas…
The critical line of QCD with four degenerate quarks
P. Cea, L. Cosmai, M. D'Elia +1
We determine the pseudo-critical couplings at imaginary chemical potentials by high-statistics Monte Carlo simulations of QCD with four degenerate quarks at non-zero temperature an…
Unstable Modes in Three-Dimensional SU(2) Gauge Theory
P. Cea, L. Cosmai
We investigate SU(2) gauge theory in a constant chromomagnetic field in three dimensions both in the continuum and on the lattice. Using a variational method to stabilize the unsta…
Large logarithmic rescaling of the scalar condensate: a subtlety with substantial phenomenological implications
P. Cea, M. Consoli, L. Cosmai
Lattice data, taken since 1998 near the critical line of a 4D Ising model, have been supporting the large logarithmic rescaling of the scalar condensate predicted in the alternativ…
The critical line of two-flavor QCD at finite isospin or baryon densities from imaginary chemical potentials
P. Cea, L. Cosmai, M. D'Elia +2
We determine the (pseudo)critical lines of QCD with two degenerate staggered fermions at nonzero temperature and quark or isospin density, in the region of imaginary chemical poten…
Cosmic Microwave Background Quadrupole and Ellipsoidal Universe
L. Campanelli, P. Cea, L. Tedesco
Recent Wilkinson Microwave Anisotropy Probe (WMAP) data confirm the Cosmic Microwave Background (CMB) quadrupole anomaly. We further elaborate our previous proposal that the quadru…
Abelian chromomagnetic background field at finite temperature on the lattice
P. Cea, L. Cosmai
The vacuum dynamics of SU(2) and SU(3) lattice gauge theories is studied by means of a gauge-invariant effective action defined using the lattice Schrödinger functional at finite…
Magnetic condensation and confinement in lattice gauge theory
P. Cea, L. Cosmai
We investigate Abelian monopoles and Abelian vortices condensation in finite temperature SU(2) and SU(3) pure lattice gauge theories.
Inflation-Produced Magnetic Fields in Nonlinear Electrodynamics
L. Campanelli, P. Cea, G. L. Fogli +1
We study the generation of primeval magnetic fields during inflation era in nonlinear theories of electrodynamics. Although the intensity of the produced fields strongly depends on…
Time Variation of the Fine Structure Constant in the Spacetime of a Domain Wall
L. Campanelli, P. Cea, L. Tedesco
The gravitational field produced by a domain wall acts as a medium with spacetime-dependent permittivity ε. Therefore, the fine structure constant α= e^2/4 Ïεwill be a time-dep…
Lattice measurement of the rescaling of the scalar condensate
P. Cea, M. Consoli, L. Cosmai
We have determined the rescaling of the scalar condensate near the critical line of a 4D Ising model. Our lattice data, supporting previous numerical indications, co…
Cosmic Parallax in Ellipsoidal Universe
L. Campanelli, P. Cea, G. L. Fogli +1
The detection of a time variation of the angle between two distant sources would reveal an anisotropic expansion of the Universe. We study this effect of "cosmic parallax" within t…
Lorentz Symmetry Violation and Galactic Magnetism
L. Campanelli, P. Cea, G. L. Fogli
We analyze the generation of primordial magnetic fields during de Sitter inflation in a Lorentz-violating theory of Electrodynamics containing a Chern-Simons term which couples the…
Comment on ``Savvidy Ferromagnetic Vacuum in Three-Dimensional Latice Gauge Theory''
P. Cea, L. Cosmai
We analyze SU(2) gauge theory in a constant chromomagnetic field in three dimensions. Our analysis instead of supporting the existence of a non-trivial minimum in the effective pot…
Charged Domain Walls
L. Campanelli, P. Cea, G. L. Fogli +1
In this paper we investigate Charged Domain Walls (CDW's), topological defects that acquire surface charge density induced by fermion states localized on the walls. The presenc…
Inflation-Produced Magnetic Fields in R^n F^2 and I F^2 models
L. Campanelli, P. Cea, G. L. Fogli +1
We re-analyze the production of seed magnetic fields during Inflation in (R/m^2)^n F_{μν}F^{μν} and I F_{μν}F^{μν} models, where n is a positive integer, R the Ricci scalar…
A lattice test of alternative interpretations of ``triviality'' in theory
A. Agodi, G. Andronico, P. Cea +4
There are two physically different interpretations of ``triviality'' in theories. The conventional description predicts a second-order phase transition and that the Hi…
Analytic continuation in QCD-like theories at finite density and finite isospin
P. Cea, L. Cosmai, M. D'Elia +1
The method of analytic continuation is one of the most powerful tools to circumvent the sign problem in lattice QCD. The present study is part of a larger project which, based on t…
On the Meissner effect in SU(2) lattice gauge theory
P. Cea, L. Cosmai
We investigate the dual superconductor model of color confinement in SU(2) lattice gauge theory. We find that the transverse distribution of the longitudinal chromoelectric field b…
Indications on the Higgs boson mass from lattice simulations
P. Cea, M. Consoli, L. Cosmai
The `triviality' of has been traditionally interpreted within perturbation theory where the prediction for the Higgs boson mass depends on the magnitude of the ultraviolet…
Anisotropic dark energy and ellipsoidal universe
L. Campanelli, P. Cea, G. L. Fogli +1
A cosmological model with anisotropic dark energy is analyzed. The amount of deviation from isotropy of the equation of state of dark energy, the skewness δ, generates an anisotro…
Comment on "No Primordial Magnetic Field from Domain Walls"
P. Cea, L. Tedesco
We comment on the recent preprint hep-ph/0007123 by M.B. Voloshin, claiming that domain walls are diamagnetic. We show that the results presented therein are based on an incorrect…
Dynamics of Walls: Fermion Scattering in Magnetic Field
L. Campanelli, P. Cea, G. L. Fogli +1
We investigate the scattering of fermions off walls in the presence of a magnetic field. We consider both the bubble wall and the kink domain wall. By solving the Dirac equation fo…
Monopole Condensation in full QCD using the Schroedinger Functional
P. Cea, L. Cosmai, M. D'Elia
We use a lattice thermal partition functional to study Abelian monopole condensation in full QCD with staggered fermions. We present preliminary results on an…
Maxwell-Kostelecký Electromagnetism and Cosmic Magnetization
L. Campanelli, P. Cea
The Lorentz violating term in the photon sector of Standard Model Extension, $\mathcal{L}_K = -{$\frac14$} (k_F)_{αβμν} F^{αβ} F^{μν}$ (here referred to as the Kostelecký…
The trivial Higgs boson: first evidences from LHC
P. Cea, L. Cosmai
We further elaborate on the triviality and spontaneous symmetry breaking scenario where the Higgs boson without self-interaction coexists with spontaneous symmetry breaking. The tr…
On the Primordial Magnetic Field from Domain Walls
P. Cea, L. Tedesco
In this paper we discuss once more the zero mode contribution to the vacuum energy density. We show that a careful treatment of the zero modes leads to the conclusion that domain w…
Further lattice evidence for a large re-scaling of the Higgs condensate
P. Cea, M. Consoli, L. Cosmai +1
Using a high-statistics lattice simulation of the Ising limit of theory, we have measured the susceptibility and propagator in the broken phase. We confirm our earlier…
First lattice evidence for a non-trivial renormalization of the Higgs condensate
P. Cea, M. Consoli, L. Cosmai
General arguments related to ``triviality'' predict that, in the broken phase of theory, the condensate re-scales by a factor different from the conventi…