María Florencia Izzo Villafañe

Comisión Nacional de Energía Atómica

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Comisión Nacional de Energía Atómica

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High Energy Physics

Research Interests

María Florencia Izzo Villafañe has a total of 14 co-authors. Here are the top co-authors by number of shared publications:

Daniel Gomez Dumm
Instituto de Fisica La Plata
7 shared publications
N. N. Scoccola
CONICET, Rivadavia 1917, (1033) Buenos Aires, Argentina
5 shared publications
Juan Pablo Carlomagno
CONICET -Departamento de Física Facultad de Ciencias Exactas Instituto de Física La Plata Universidad Nacional de La PLata C.C. 67 1900) La Plata Argentina
2 shared publications
Ana Gabriela Grunfeld
CONICET
1 shared publication
Daniel Gómez Dumm
Departamento de Física, Instituto de Física La Plata, Facultad de Ciencias Exactas, Universidad de La Plata (UNLP), CC. 67, 1900 La Plata, Argentina
1 shared publication
German Lugones
Universidade Federal do ABC
1 shared publication

Latest Publications

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Cited by 3
- 21 January 2025
- Published by MDPI AG in Universe
Surface and Curvature Tensions of Cold, Dense Quark Matter: A Term-by-Term Analysis Within the Nambu–Jona–Lasinio Model
by Ana Gabriela Grunfeld, María Florencia Izzo Villafañe, Germán Lugones
In this paper, we conduct a thorough investigation of the surface and curvature tensions, $σ$ and $γ$ , of three-flavor cold quark matter using the Nambu–Jona–Lasinio (NJL) model with vector interactions. Our approach ensures both local and global electric charge neutrality, as well as chemical equilibrium under weak interactions. By employing the multiple reflection expansion formalism to account for finite size effects, we explore the impact of specific input parameters, particularly the vector coupling constant ratio $η_{V}$ , the radius R of quark matter droplets, as well as the charge-per-baryon ratio $ξ$ of the finite size configurations. We focus on the role of the contributions of each term of the NJL Lagrangian to the surface and curvature tensions in the mean field approximation. We find that the total surface tension exhibits two different density regimes: it remains roughly constant at around $100 MeV {fm}^{- 2}$ up to approximately 2–4 times the nuclear saturation density, and beyond this point, it becomes a steeply increasing function of $n_{B}$ . The total surface and curvature tensions are relatively insensitive to variations in R but are affected by changes in $ξ$ and $η_{V}$ . We observe that the largest contribution to $σ$ and $γ$ comes from the regularized divergent term, making these quantities significantly higher than those obtained within the MIT bag model.
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- 21 January 2025
- Published by MDPI AG in Universe
Open Access
Surface and Curvature Tensions of Cold, Dense Quark Matter: A Term-by-Term Analysis Within the Nambu–Jona–Lasinio Model
by Ana Gabriela Grunfeld, María Florencia Izzo Villafañe, Germán Lugones
In this paper, we conduct a thorough investigation of the surface and curvature tensions, $σ$ and $γ$ , of three-flavor cold quark matter using the Nambu–Jona–Lasinio (NJL) model with vector interactions. Our approach ensures both local and global electric charge neutrality, as well as chemical equilibrium under weak interactions. By employing the multiple reflection expansion formalism to account for finite size effects, we explore the impact of specific input parameters, particularly the vector coupling constant ratio $η_{V}$ , the radius R of quark matter droplets, as well as the charge-per-baryon ratio $ξ$ of the finite size configurations. We focus on the role of the contributions of each term of the NJL Lagrangian to the surface and curvature tensions in the mean field approximation. We find that the total surface tension exhibits two different density regimes: it remains roughly constant at around $100 MeV {fm}^{- 2}$ up to approximately 2–4 times the nuclear saturation density, and beyond this point, it becomes a steeply increasing function of $n_{B}$ . The total surface and curvature tensions are relatively insensitive to variations in R but are affected by changes in $ξ$ and $η_{V}$ . We observe that the largest contribution to $σ$ and $γ$ comes from the regularized divergent term, making these quantities significantly higher than those obtained within the MIT bag model.
Cited by 3
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Cited by 31
- 28 November 2022
- Published by American Physical Society (APS) in Physical Review D
Charged pseudoscalar and vector meson masses in strong magnetic fields in an extended NJL model
by J. P. Carlomagno, D. Gómez Dumm, M. F. Izzo Villafañe, S. Noguera, N. N. Scoccola
The mass spectrum of $π^{+}$ and $ρ^{+}$ mesons in the presence of a static uniform magnetic field $\vec{B}$ is studied within a two-flavor Nambu-Jona-Lasinio-like model. We improve previous calculations, taking into account the effect of Schwinger phases carried by quark propagators and using an expansion of meson fields in terms of the solutions of the corresponding equations of motion for nonzero $B$ . It is shown that the meson polarization functions are diagonal in this basis. Our numerical results for the $ρ^{+}$ meson spectrum are found to disfavor the existence of a meson condensate induced by the magnetic field. In the case of the $π^{+}$ meson, $π$ — $ρ$ mixing effects are analyzed for the meson lowest-energy state. The predictions of the model are compared with available lattice QCD results.
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- 28 November 2022
- Published by American Physical Society (APS) in Physical Review D
Open Access
Charged pseudoscalar and vector meson masses in strong magnetic fields in an extended NJL model
by J. P. Carlomagno, D. Gómez Dumm, M. F. Izzo Villafañe, S. Noguera, N. N. Scoccola
The mass spectrum of $π^{+}$ and $ρ^{+}$ mesons in the presence of a static uniform magnetic field $\vec{B}$ is studied within a two-flavor Nambu-Jona-Lasinio-like model. We improve previous calculations, taking into account the effect of Schwinger phases carried by quark propagators and using an expansion of meson fields in terms of the solutions of the corresponding equations of motion for nonzero $B$ . It is shown that the meson polarization functions are diagonal in this basis. Our numerical results for the $ρ^{+}$ meson spectrum are found to disfavor the existence of a meson condensate induced by the magnetic field. In the case of the $π^{+}$ meson, $π$ — $ρ$ mixing effects are analyzed for the meson lowest-energy state. The predictions of the model are compared with available lattice QCD results.
Cited by 31
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Cited by 14
- 29 June 2020
- Published by American Physical Society (APS) in Physical Review D
Properties of magnetized neutral pions at zero and finite temperature in nonlocal chiral quark models
by D. Gómez Dumm, M. F. Izzo Villafañe, N. N. Scoccola
The behavior of $π^{0}$ meson properties in the presence of a uniform external magnetic field is studied in the context of a nonlocal extension of the Polyakov-Nambu-Jona-Lasinio model. The analysis includes the $π^{0}$ mass, the effective $π^{0}$ -quark coupling and the pion-to-vacuum hadronic form factors, both at zero and finite temperature. Numerical results are compared with previous calculations carried out within the local NJL model, when available. The validity of chiral relations and the features of deconfinement and chiral symmetry restoration transitions are discussed.
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- 29 June 2020
- Published by American Physical Society (APS) in Physical Review D
Open Access
Properties of magnetized neutral pions at zero and finite temperature in nonlocal chiral quark models
by D. Gómez Dumm, M. F. Izzo Villafañe, N. N. Scoccola
The behavior of $π^{0}$ meson properties in the presence of a uniform external magnetic field is studied in the context of a nonlocal extension of the Polyakov-Nambu-Jona-Lasinio model. The analysis includes the $π^{0}$ mass, the effective $π^{0}$ -quark coupling and the pion-to-vacuum hadronic form factors, both at zero and finite temperature. Numerical results are compared with previous calculations carried out within the local NJL model, when available. The validity of chiral relations and the features of deconfinement and chiral symmetry restoration transitions are discussed.
Cited by 14
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Cited by 13
- 14 October 2019
- Published by American Physical Society (APS) in Physical Review D
Properties of vector and axial-vector mesons in a nonlocal SU(2) PNJL model
by J. P. Carlomagno, M. F. Izzo Villafañe
We study the features of a SU(2) Polyakov-Nambu-Jona-Lasinio model that includes wave function renormalization and nonlocal vector interactions. Within this framework we analyze, among other properties, the masses, width, and decay constants of light vector and axial-vector mesons at finite temperature. Then we obtain the corresponding phase diagram in a finite density scenario, after characterizing the deconfinement and chiral restoration transitions.
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- 14 October 2019
- Published by American Physical Society (APS) in Physical Review D
Open Access
Properties of vector and axial-vector mesons in a nonlocal SU(2) PNJL model
by J. P. Carlomagno, M. F. Izzo Villafañe
We study the features of a SU(2) Polyakov-Nambu-Jona-Lasinio model that includes wave function renormalization and nonlocal vector interactions. Within this framework we analyze, among other properties, the masses, width, and decay constants of light vector and axial-vector mesons at finite temperature. Then we obtain the corresponding phase diagram in a finite density scenario, after characterizing the deconfinement and chiral restoration transitions.
Cited by 13
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Cited by 56
- 23 February 2018
- Published by American Physical Society (APS) in Physical Review D
Neutral meson properties under an external magnetic field in nonlocal chiral quark models
by D. Gómez Dumm, M. F. Izzo Villafañe, N. N. Scoccola
We study the behavior of neutral meson properties in the presence of a static uniform external magnetic field in the context of nonlocal chiral quark models. The formalism is worked out introducing Ritus transforms of Dirac fields, which allow to obtain closed analytical expressions for $π^{0}$ and $σ$ meson masses and for the $π^{0}$ decay constant. Numerical results for these observables are quoted for various parametrizations. In particular, the behavior of the $π^{0}$ meson mass with the magnetic field is found to be in good agreement with lattice QCD results. It is also seen that the Goldberger-Treiman and Gell-Mann-Oakes-Renner chiral relations remain valid within these models in the presence of the external magnetic field.
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- 23 February 2018
- Published by American Physical Society (APS) in Physical Review D
Open Access
Neutral meson properties under an external magnetic field in nonlocal chiral quark models
by D. Gómez Dumm, M. F. Izzo Villafañe, N. N. Scoccola
We study the behavior of neutral meson properties in the presence of a static uniform external magnetic field in the context of nonlocal chiral quark models. The formalism is worked out introducing Ritus transforms of Dirac fields, which allow to obtain closed analytical expressions for $π^{0}$ and $σ$ meson masses and for the $π^{0}$ decay constant. Numerical results for these observables are quoted for various parametrizations. In particular, the behavior of the $π^{0}$ meson mass with the magnetic field is found to be in good agreement with lattice QCD results. It is also seen that the Goldberger-Treiman and Gell-Mann-Oakes-Renner chiral relations remain valid within these models in the presence of the external magnetic field.
Cited by 56
Open Access
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- 26 January 2018
- Published by EDP Sciences in EPJ Web of Conferences
Strong magnetic fields in a nonlocal Polyakov chiral quark model
by D. Gómez Dumm, M.F. Izzo Villafañe, S. Noguera, V.P. Pagura, N.N. Scoccola
We study the behavior of strongly interacting matter under an external constant magnetic field in the context of nonlocal chiral quark models that incorporate a coupling to the Polyakov loop. We find that at zero temperature the behavior of the quark condensates shows the expected magnetic catalysis effect, our predictions being in good quantitative agreement with lattice QCD results. On the other hand when the analysis is extended to the case of finite temperature our results show that nonlocal models naturally lead to the Inverse Magnetic Catalysis effect for both the chiral restoration and deconfinement transition temperatures.
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- 26 January 2018
- Published by EDP Sciences in EPJ Web of Conferences
Open Access
Strong magnetic fields in a nonlocal Polyakov chiral quark model
by D. Gómez Dumm, M.F. Izzo Villafañe, S. Noguera, V.P. Pagura, N.N. Scoccola
We study the behavior of strongly interacting matter under an external constant magnetic field in the context of nonlocal chiral quark models that incorporate a coupling to the Polyakov loop. We find that at zero temperature the behavior of the quark condensates shows the expected magnetic catalysis effect, our predictions being in good quantitative agreement with lattice QCD results. On the other hand when the analysis is extended to the case of finite temperature our results show that nonlocal models naturally lead to the Inverse Magnetic Catalysis effect for both the chiral restoration and deconfinement transition temperatures.
Open Access
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Cited by 33
- 13 December 2017
- Published by American Physical Society (APS) in Physical Review D
Strong magnetic fields in nonlocal chiral quark models
by D. Gómez Dumm, M. F. Izzo Villafañe, S. Noguera, V. P. Pagura, N. N. Scoccola
We study the behavior of strongly interacting matter under a uniform intense external magnetic field in the context of nonlocal extensions of the Polyakov–Nambu–Jona-Lasinio model. A detailed description of the formalism is presented, considering the cases of zero and finite temperature. In particular, we analyze the effect of the magnetic field on the chiral restoration and deconfinement transitions, which are found to occur at approximately the same critical temperatures. Our results show that these models offer a natural framework to account for the phenomenon of inverse magnetic catalysis found in lattice QCD calculations.
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- 13 December 2017
- Published by American Physical Society (APS) in Physical Review D
Open Access
Strong magnetic fields in nonlocal chiral quark models
by D. Gómez Dumm, M. F. Izzo Villafañe, S. Noguera, V. P. Pagura, N. N. Scoccola
We study the behavior of strongly interacting matter under a uniform intense external magnetic field in the context of nonlocal extensions of the Polyakov–Nambu–Jona-Lasinio model. A detailed description of the formalism is presented, considering the cases of zero and finite temperature. In particular, we analyze the effect of the magnetic field on the chiral restoration and deconfinement transitions, which are found to occur at approximately the same critical temperatures. Our results show that these models offer a natural framework to account for the phenomenon of inverse magnetic catalysis found in lattice QCD calculations.
Cited by 33
Open Access
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- 1 January 2017
- Published by World Scientific Pub Co Pte Ltd in International Journal of Modern Physics: Conference Series
QCD Phase Diagram in a Nonlocal SU(3) NJL Model with Lattice-Inspired Form Factors
by María Florencia Izzo Villafañe, Juan Pablo Carlomagno, Daniel Gómez Dumm, Norberto N. Scoccola
We study the QCD phase diagram in the framework of a nonlocal three-flavor quark model. We determine the model parameters from vacuum meson phenomenology, considering lattice QCD-inspired nonlocal form factors. Then we analyze the features of the deconfinement and chiral restoration transitions for systems at nonzero temperature and chemical potential.
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- 1 January 2017
- Published by World Scientific Pub Co Pte Ltd in International Journal of Modern Physics: Conference Series
Open Access
QCD Phase Diagram in a Nonlocal SU(3) NJL Model with Lattice-Inspired Form Factors
by María Florencia Izzo Villafañe, Juan Pablo Carlomagno, Daniel Gómez Dumm, Norberto N. Scoccola
We study the QCD phase diagram in the framework of a nonlocal three-flavor quark model. We determine the model parameters from vacuum meson phenomenology, considering lattice QCD-inspired nonlocal form factors. Then we analyze the features of the deconfinement and chiral restoration transitions for systems at nonzero temperature and chemical potential.
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Cited by 15
- 2 September 2016
- Published by American Physical Society (APS) in Physical Review D
Vector and axial vector mesons in a nonlocal chiral quark model
by M. F. Izzo Villafañe, D. Gómez Dumm, N. N. Scoccola
Basic features of nonstrange vector and axial vector mesons are analyzed in the framework of a chiral quark model that includes nonlocal four-fermion couplings. Unknown model parameters are determined from some input values of masses and decay constants, while nonlocal form factors are taken from a fit to lattice QCD results for effective quark propagators. Numerical results show a good agreement with the observed meson phenomenology.
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- 2 September 2016
- Published by American Physical Society (APS) in Physical Review D
Vector and axial vector mesons in a nonlocal chiral quark model
by M. F. Izzo Villafañe, D. Gómez Dumm, N. N. Scoccola
Basic features of nonstrange vector and axial vector mesons are analyzed in the framework of a chiral quark model that includes nonlocal four-fermion couplings. Unknown model parameters are determined from some input values of masses and decay constants, while nonlocal form factors are taken from a fit to lattice QCD results for effective quark propagators. Numerical results show a good agreement with the observed meson phenomenology.
Cited by 15
Open Access
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Cited by 1
- 1 April 2016
- Published by IOP Publishing in Journal of Physics: Conference Series
Vector mesons within nonlocal chiral quark models for strong interactions
by M.F. Izzo Villafañe, D. Gómez Dumm
We analyze meson properties within an SU(2) chiral quark model that includes nonlocal four fermion couplings with wave function renormalization. Model parameters are determined from meson phenomenology, considering different nonlocal form factor shapes. We concentrate in the description of basic features of nonstrange vector and axial vector mesons, considering nonlocal form factors that are based in lattice QCD results for effective quark propagators.
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- 1 April 2016
- Published by IOP Publishing in Journal of Physics: Conference Series
Open Access
Vector mesons within nonlocal chiral quark models for strong interactions
by M.F. Izzo Villafañe, D. Gómez Dumm
We analyze meson properties within an SU(2) chiral quark model that includes nonlocal four fermion couplings with wave function renormalization. Model parameters are determined from meson phenomenology, considering different nonlocal form factor shapes. We concentrate in the description of basic features of nonstrange vector and axial vector mesons, considering nonlocal form factors that are based in lattice QCD results for effective quark propagators.
Cited by 1

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