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61 papers · 1 filter
Bayesian analysis of hybrid neutron star EOS constraints within an instantaneous nonlocal chiral quark matter model
Alexander Ayriyan, David Blaschke, Juan Pablo Carlomagno +2
We present a physics-informed Bayesian analysis of equation of state constraints using observational data for masses, radii and tidal deformability of pulsars and a generic class o…
Strongly interacting matter in extreme magnetic fields
Prabal Adhikari, Martin Ammon, Sidney S. Avancini +58
Magnetic fields are ubiquitous across different physical systems of current interest; from the early Universe, compact astrophysical objects and heavy-ion collisions to condensed m…
Hybrid isentropic twin stars
Juan Pablo Carlomagno, Gustavo A. Contrera, Ana Gabriela Grunfeld +1
We present a study of hybrid neutron stars with color superconducting quark matter cores at finite temperature that results in sequences of stars with constant entropy per baryon,…
Thermal twin stars within a hybrid equation of state based on a nonlocal chiral quark model compatible with modern astrophysical observations
J. P. Carlomagno, G. A. Contrera, A. G. Grunfeld +1
We investigate the extension to finite temperatures and neutrino chemical potentials of a recently developed nonlocal chiral quark model approach to the equation of state of neutro…
Nuclear response to dark matter signals in Ge and Xe odd-mass targets
M. M. Saez, O. Civitarese, T. Tarutina +1
Abstract: The interaction of dark matter particles (WIMPs) with the odd-mass Ge and Xe target nuclei ,{ {that is the recoil rates corresponding to the elastic scatte…
Influence of hyperon-hyperon interaction on the properties of neutron stars
R. M. Aguirre
The properties of neutron stars are studied in a composite model of the strong interaction. In the regime of low to medium baryonic densities a covariant hadronic model is adopted…
Hyperons, deconfinement and the speed of sound in neutron stars
R. M. Aguirre
The effects of the presence of hyperons and a phase transition to deconfined quark matter on the speed of sound in neutron stars is investigated. For this purpose a composite descr…
Weak pion-production and the second resonance region
D. F. Tamayo Agudelo, A. Mariano, D. E. Jaramillo Arango
In this work we report the calculation of the total cross section for pion-production by the dispersion of neutrinos on nucleons. We use a consistent formalism for the intermediate…
Quark-nuclear hybrid equation of state for neutron stars under modern observational constraints
G. A. Contrera, D. Blaschke, J. P. Carlomagno +2
We study a family of equations of state for hybrid neutron star matter. The hybrid EOS are obtained by a Maxwell construction of the first-order phase transition between a hadronic…
Neutrinoless -Decay in DCEQTDA
C. De Conti, V. dos S. Ferreira, A. R. Samana +2
We have recently developed a nuclear model, which is a natural extension of the -QRPA model, specially designed to describe double charge exchange (DCE) processes generated by…
Asymmetry of the neutrino mean free path in partially spin polarized neutron matter within the Skyrme model
E. Bauer, J. Torres Patiño
The asymmetry in the neutrino mean free path for the absorption reaction , is evaluated within hot neutron matter under a strong magnetic field. We cons…
Vacuum effects on the properties of nuclear matter under an external magnetic field
R. M. Aguirre
The effects of the Dirac sea of the nucleons are investigated within a covariant model of the hadronic interaction. We extend the usual Mean Field Approximation and present a proce…
A Nuclear Structure Model for Double Charge-Exchange Processes
V. dos S. Ferreira, A. R. Samana, F. Krmpotić +1
A new model, based on the BCS approach, is specially designed to describe nuclear phenomena of double-charge exchange (DCE). After being proposed, and…
Hot quark matter and (proto-) neutron stars
G. Malfatti, M. Orsaria, G. A. Contrera +2
In part one of this paper, we use a non-local extension of the 3-flavor Polyakov-Nambu-Jona-Lasinio model, which takes into account flavor-mixing, momentum dependent quark masses,…
Effects of Hadron-Quark Phase Transitions in Hybrid Stars within the NJL Model
Ignacio Francisco Ranea-Sandoval, Milva Gabriela Orsaria, Germán Malfatti +4
We study local and non-local Polyakov Nambu-Jona-Lasinio models and analyze their respective phase transition diagram. We construct hybrid stars using the zero temperature limit of…
Asymmetry of the neutrino mean free path in hot neutron matter under strong magnetic fields
Julio Torres Patiño, Eduardo Bauer, Isaac Vidaña
The neutrino mean free path in neutron matter under a strong magnetic field is evaluated for the inelastic scattering reaction and studied as a function of the neutron matter densi…
In medium properties of and mesons under an external magnetic field
R. M. Aguirre
The one loop polarization insertions for the kaon and the mesons are evaluated in a hadronic medium as functions of the field intensity and the baryonic density. For this purpo…
Neutrino Emissivity in the Quark-Hadron Mixed Phase
William M. Spinella, Fridolin Weber, Milva G. Orsaria +1
In this work we investigate the effect a crystalline quark-hadron mixed phase can have on the neutrino emissivity from the cores of neutron stars. To this end we use relativistic m…
Modification of the masses of the lightest neutral mesons in a hadronic medium under an external magnetic field
R. M. Aguirre
The effective masses of the neutral mesons in a hadronic medium and under an external magnetic field are evaluated as functions of the baryonic density and the field intensity. For…
Nonmesonic weak decay of charmed hypernuclei
C. E. Fontoura, F. Krmpotić, A. P. Galeão +2
We present a study of the nonmesonic weak decay (NMWD) of charmed hypernuclei using a relativistic formalism. We work within the framework of the independent particle shell model a…
Partial restoration of spin-isospin SU(4) Symmetry and the One-QRPA method in Double Beta Decay
V. dos S. Ferreira, F. Krmpotić, C. A. Barbero +1
The one-QRPA method is used to describe simultaneously both double decay beta modes, giving special attention to the partial restoration of spin-isospin SU(4) symmetry. To implemen…
Nonmesonic Weak Decay of Hypernuclei: The Three--Nucleon Induced Mode
E. Bauer, G. Garbarino, C. A. Rodríguez Peña
The nonmesonic weak decay of hypernuclei is studied within a microscopic diagrammatic approach which is extended to include the three--nucleon induced mechanism. We adopt a nuc…
Hadronic matter under an external magnetic field: in medium modification of the pion mass
R. Aguirre
The covariant propagator of a fermion with intrinsic magnetic moment interacting with a uniform external magnetic field is presented for finite temperature and baryonic density. Th…
In-medium covariant propagator of baryons under a strong magnetic field: effect of the intrinsic magnetic moments
R. M. Aguirre, A. L. De Paoli
We obtain the covariant propagator at finite temperature for interacting baryons immersed in a strong magnetic field. The effect of the intrinsic magnetic moments on the Green func…