79 citations · 1.2k across the 123 of their papers we have counts for
36 papers · 1 filter
Yukawa theory in non-perturbative regimes: towards confinement, exact -function and conformal phase
Marco Frasca, Anish Ghoshal
We study possible hints towards confinement in a Z-invariant Yukawa system with massless fermions and a real scalar field in the strongly-coupled regime. Using the tools develo…
Effective potential in non-perturbative gauge theories
Gianluca Calcagni, Marco Frasca, Anish Ghoshal
We consider a formalism to describe the false-vacuum decay of a scalar field in gauge theories in non-perturbative regimes. We find that the larger the gauge coupling with respect…
Confining complex ghost degrees of freedom
Marco Frasca, Anish Ghoshal, Alexey S. Koshelev
We show a theorem proving that a non-local bosonic field upon a covariant interaction with a confining gauge field undergoes the confinement of its degrees of freedom present in th…
Quintessence Dark Energy from strongly-coupled Higgs mass gap: Local and Non-local higher-derivative non-perturbative scenarios
Marco Frasca, Anish Ghoshal, Alexey Koshelev
We entertain the possibility that dark energy arises from the Higgs field of quintessence type in the non-perturbative regimes. For this purpose we utilize a set of exact solutions…
Fate of False Vacuum in Non-perturbative Regimes
Marco Frasca, Anish Ghoshal, Nobuchika Okada
We use some exact results in the scalar field theory to revise the analysis by Coleman and Callan about the false vacuum decay and propose a simple non-perturbative formalism. We i…
Confinement and Renormalization Group Equations in String-inspired Non-local Gauge Theories
Marco Frasca, Anish Ghoshal, Nobuchika Okada
As an extension of the weak perturbation theory obtained in recent analysis on infinite-derivative non-local non-Abelian gauge theories motivated from p-adic string field theory, a…
Strongly Coupled String-inspired Infinite Derivative Non-local Yang-Mills: Diluted Mass Gap
Marco Frasca, Anish Ghoshal
We investigate the non-perturbative regimes in the class of non-Abelian theories that have been proposed as an ultraviolet completion 4-D Quantum Field Theory (QFT) generalizing th…
Mass Gap in Infinite Derivative Non-local Higgs: Dyson-Schwinger Approach
Marco Frasca, Anish Ghoshal
We investigate the non-perturbative degrees of freedom in the class of non-local Higgs theories that have been proposed as an ultraviolet completion 4-D Quantum Field Theory (QFT)…
Condition for confinement in non-Abelian gauge theories
Masud Chaichian, Marco Frasca
We show that a criterion for confinement, based on the BRST invariance, holds in four dimensions, by solving a non-Abelian gauge theory with a set of exact solutions. The confineme…
Confinement in a three-dimensional Yang-Mills theory
Marco Frasca
We show that, starting from known exact classical solutions of the Yang-Mills theory in three dimensions, the string tension is obtained and the potential is consistent with a marg…
Numerical study of the Dyson-Schwinger equations for the Wess-Zumino model
Marco Frasca
Supersymmetric models, in most cases, suffer from the lack of non-perturbative techniques. Recently, an approach based on Dyson-Schwinger equations has been proposed for the massle…
Classical solutions of a massless Wess-Zumino model
Marco Frasca
We provide a current expansion for the classical equations of motion of the massles Wess-Zumino model. In the low-energy limit, there appears a massive behavior for bosonic degrees…
Chiral Wess-Zumino model and breaking of supersymmetry
Marco Frasca
We prove that the Wess-Zumino model breaks supersymmetry in the low-energy limit. The mechanism is identical to the breaking of chiral symmetry in quantum chromodynamics as the low…
Mapping theorem and Green functions in Yang-Mills theory
Marco Frasca
It is shown how, starting from a mapping theorem recently proved between massless quartic scalar field theory and Yang-Mills theory, both two-point functions and spectrum of the Ya…
Mass generation and supersymmetry
Marco Frasca
Using a recent understanding of mass generation for Yang-Mills theory and a quartic massless scalar field theory mapping each other, we show that when such a scalar field theory is…
Exact solution of Dyson-Schwinger equations for a scalar field theory
Marco Frasca
We exactly solve Dyson-Schwinger equations for a massless quartic scalar field theory. n-point functions are computed till n=4 and the exact propagator computed from the two-point…
Exact Massive Solutions of Classical Massless Field Theories
Marco Frasca
We give the exact solution of classical equation of motion of a quartic scalar massless field theory showing that this is massive and is represented by a superposition of free part…
Infrared QCD
Marco Frasca
We prove that Nambu-Jona-Lasinio model is an exact description of infrared QCD deriving it from QCD Lagrangian. The model we obtain is renormalizable and confining but, taking very…
Infrared behavior of the running coupling in scalar field theory
Marco Frasca
We compute the Green function of the massless scalar field theory in the infrared till the next-to-leading order, providing a fully covariant strong coupling expansion. Applying Ca…
Källen-Lehman Representation and the Gluon Propagator
Marco Frasca
We exploit the Kallen-Lehman representation of the two-point Green function to prove that the gluon propagator cannot go to zero in the infrared limit. We are able to derive also t…
Infrared Gluon and Ghost Propagators
Marco Frasca
We derive the form of the infrared gluon propagator by proving a mapping in the infrared of the quantum Yang-Mills and theories. The equivalence is complete at a classical l…
Spectrum of Yang-Mills Theory in D=3+1
Marco Frasca
We give a comparison of the spectrum of Yang-Mills theory in , recently derived with a strong coupling expansion, with lattice data. We verify excellent agreement also for 2…
Green functions and nonlinear systems: Short time expansion
Marco Frasca
We show that Green function methods can be straightforwardly applied to nonlinear equations appearing as the leading order of a short time expansion. Higher order corrections can b…
Spectrum in the broken phase of a theory
Marco Frasca
We derive the spectrum in the broken phase of a theory, in the limit , showing that this goes as even integers of a renormalized mass in agreement with recent la…