We calculate the baryon-meson coupling constants for spin-$1/2$ baryonic octet and spin-$3/2$ decuplet in a unified approach relying on symmetry arguments such as fact that Yukawa couplings, present Lagrangian density of Walecka-type models, must be an invariant under SU(3) SU(6) group transformations. The baryon with scalar $\ensuremath{\sigma}$ meson are fixed to reproduce known potential depths hyperons $\mathrm{\ensuremath{\Delta}}$ resonances, can extended all particles. then apply...

Abstract We study radial oscillations of hybrid neutron stars composed hadronic external layers followed by a quark matter core. employ density-dependent relativistic mean-field model including hyperons and Δ baryons to describe matter, for matter. obtain the ten lowest eigenfrequencies corresponding oscillation functions N, N+Δ, N+H, N+H+Δ equations-of-state with phase transition at 1.4 1.8 M ⊙ , focusing on effects slow hadron-quark interface. observe that maximum mass is reached before...

We investigate the effect of $\Delta$ baryons on radial oscillations neutron and hyperon stars, employing a density-dependent relativistic mean-field model. The spin-$3/2$ are described by Rarita-Schwinger Lagrangian density. baryon-meson coupling constants for spin-3/2 decuplet spin-1/2 baryonic octet calculated using unified approach relying fact that Yukawa couplings present in density models must be invariant under SU(3) SU(6) group transformations. calculate 20 lowest eigenfrequencies...

This study investigates the radial oscillations of hybrid neutron stars, characterized by a composition hadronic external layers and quark matter core. Utilizing density-dependent relativistic mean-field model that incorporates hyperons baryons for describing matter, we analyze ten lowest eigenfrequencies their corresponding oscillation functions. Our focus lies on stars with equations-of-state involving N, N + $\Delta$, H, H featuring phase transition to matter. Emphasizing effects slow at...

For the first time, we use relativistic mean-field approximation with density-dependent couplings, adjusted by Density-Dependent Meson-Exchange 2 (DDME2) parameterization, to investigate effects of dark matter on supernova remnants. We calculate nuclear equation state for and separately, under thermodynamic conditions related evolution A mirrored model is adopted matter, its effect remnant studied using a two-fluid scenario. At each stage evolution, assume that ordinary have same entropy...

Strong magnetic fields can modify the microscopic composition of matter affecting also properties and evolution massive objects such as compact stars. This paper explores combined effect heavy baryons---hyperons $\mathrm{\ensuremath{\Delta}}$'s---on structure neutron stars with strong fields, so-called magnetars. The authors show that $\mathrm{\ensuremath{\Delta}}$'s are favored over hyperons contrary to expectations they do not make nuclear equation state softer.

ABSTRACT We study the nuclear isentropic equation of state for a stellar matter composed nucleons, hyperons, and Δ-resonances. investigate different snapshots evolution neutron star, from its birth as lepton-rich proto-neutron star in aftermath supernova explosion to lepton-poor regime when starts cooling catalysed configuration. use relativistic model within mean-field approximation describe hot adopt density-dependent couplings adjusted by DDME2 parameterization. baryon–meson spin-1/2...

By applying a relativistic mean-field description of neutron star matter with density dependent couplings, we analyze the properties two different compositions: nucleonic $\mathrm{\ensuremath{\Delta}}$ baryons and hyperons baryons. The $\mathrm{\ensuremath{\Delta}}$-meson couplings are allowed to vary within wide range values obtained by experimental data, while hyperon-meson fitted hypernuclear properties. Neutron no deconfinement phase transition studied. It is verified that many models...

We have revisited the nucleation process based on Lifshitz-Kagan theory, which is underlying mechanism of conversion a pulsar constituted hadronic matter to quark star. selected appropriate models that been tested against experimental and observational constraints restrict model arbitrariness present in previous investigations. The phase transition pressures chemical potentials identified afterwards, tunneling probabilities time were computed. critical for half life metastable one year...

In the present work we use modified versions of MIT bag model, on which both a vector field and self-interacting term are introduced, to obtain hot quark matter investigate QCD phase diagram. We first analyze two-flavored constrained freeze-out liquid-gas transition at hadronic phase. Later, three-flavored subject $β$ equilibrium charge neutrality is used compute star macroscopic properties, confronted with recent observational massive canonical radius results. Finally, comparison diagrams...

Different extensions of the Nambu-Jona-Lasinio model, known to satisfy expected QCD chiral symmetry aspects, are used investigate a possible hadron-quark phase transition at zero temperature and build corresponding binodal sections. We have shown that point is very sensitive model parameters both pressure chemical potential increase drastically with vector interaction strength in quark sector. Within same framework, possibility hybrid star formation analyzed. The conclusions drawn before...

We study radial oscillations of hybrid neutron stars composed hadronic external layers followed by a quark matter core. employ density-dependent relativistic mean-field model including hyperons and ${\Delta}$ baryons to describe matter, for matter. obtain the ten lowest eigenfrequencies corresponding oscillation functions N, N+${\Delta}$, N+H, N+H+${\Delta}$ equations-of-state with phase transition at 1.4 1.8 ${M_{\odot}}$, focusing on effects slow hadron-quark interface. observe that...

A microscopic nuclear matter formalism with explicit chiral symmetry based on the Nambu Jona-Lasinio model is considered to describe matter. To reproduce properties adequately at saturation density, four-point and eight-point interactions are introduced. Within a Bayesian inference approach, parameters of determined by imposing matter, both experimental from {\it ab-initio} calculations, neutron star observational constraints. Nuclear well reproduced an effective mass 0.75 0.8 nucleon...

This study investigates the radial oscillations of hybrid neutron stars, characterized by a composition hadronic external layers and quark matter core. Utilizing density-dependent relativistic mean-field model that incorporates hyperons baryons for describing matter, we analyze ten lowest eigenfrequencies their corresponding oscillation functions. Our focus lies on stars with equations-of-state involving N, N + $\Delta$, H, H featuring phase transition to matter. Emphasizing effects slow at...

We study the effects of hyperons, delta baryons, and quark matter phase transitions on f-mode oscillations in neutron stars. Using density-dependent relativistic mean-field model (DDME2) for hadronic mass (DDQM) phase, we construct hybrid equations state (EoSs) consistent with astrophysical constraints. Including hyperons baryons soften EoS, reducing maximum masse, while transition to further softens decreasing speed sound hence mass. frequencies, calculated using both Cowling approximation...

For the first time, we use relativistic mean-field (RMF) approximation with density-dependent couplings, adjusted by DDME2 parameterization, to investigate effects of dark matter on supernova remnants. We calculate nuclear equation state for and separately, under thermodynamic conditions related evolution A mirrored model is adopted matter, its effect remnant studied using a two-fluid scenario. At each stage evolution, assume that ordinary have same entropy lepton fraction, fixed proportion...

We study the nuclear isentropic equation of state for a stellar matter composed nucleons, hyperons, and $Δ$-resonances. investigate different snapshots evolution neutron star, from its birth as lepton-rich protoneutron star in aftermath supernova explosion to lepton-poor regime when starts cooling catalyzed configuration. use relativistic model within mean-field approximation describe hot adopt density-dependent couplings adjusted by DDME2 parameterization. baryon-meson spin-$1/2$ baryonic...

We investigate the effect of $Δ$ baryons on radial oscillations neutron and hyperon stars, employing a density-dependent relativistic mean-field model. The spin-$3/2$ are described by Rarita-Schwinger Lagrangian density. baryon-meson coupling constants for spin-3/2 decuplet spin-1/2 baryonic octet calculated using unified approach relying fact that Yukawa couplings present in density models must be invariant under SU(3) SU(6) group transformations. calculate 20 lowest eigenfrequencies...

The phenomenon that originates gamma ray bursts (GRBs) remains undefined. In this work the conversion of a hadronic star into quark is discussed as one possible causes GRBs. Effective models are used to describe compact stars and obtain their equations state. Macroscopic properties, such baryonic gravitational masses, both types then obtained from solution hydrostatic equilibrium equations. relation between values allows calculate amount energy possibly released in process. results compared...