In the present work we investigate effects of dark matter (DM) on hybrid star properties. We assume that is mixed with both hadronic and quark interact them through exchange a Higgs boson. The properties are obtained from equations state calculated Maxwell prescription. For use NL3* parameter set for matter, MIT bag model vector interaction. see does not influence phase transition points (pressure chemical potential) but shifts discontinuity energy density, which ultimately reduces minimum...

Using the well-known quantum hadrodynamics, we study effects of meson-hyperon coupling constants on onset hyperons in dense nuclear matter. We use SU(3) symmetry group to fix all these constants, constrained experimental matter results and astrophysical observations. While discovery massive pulsars PSR J1614-2230 J0348+0432 points towards a very stiff equation state at large densities, from heavy-ion collisions point opposite direction for densities below 5 times saturation density. some...

In this work, we make a very extensive study on the conditions that allow mass-gap object in GW190814 event to be faced as degenerate star instead of black hole. We begin revisiting some parametrizations Quantum Hadrodynamics (QHD) and then under which hyperons are present such massive star. Afterward, using vector MIT based model, if self-bound quark stars, satisfying Bodmer-Witten conjecture fulfill all observational constraints. Finally, hybrid stars within Maxwell construction check for...

ABSTRACT Motivated by the recent suggestions that very massive pulsar (PSR J0952−0607) and light compact object (HESS J1731−347) exist, in this article, we revisit possibility of such objects being strange stars instead standard hadronic neutron stars. We study possible presence local anisotropy how it affects macroscopic properties compare our results with constraints presented literature. found increases maximum mass, radius canonical star, its tidal deformability for positive values λBL...

In this work, we perform a comparative analysis between the density-dependent quark model and vector MIT bag using Bayesian analysis. We use equations of state generated by these two models to describe stars. impose four recent observational astrophysical constraints on both determine their model-dependent parameters in an optimized manner assuming that compact objects observed are composed entirely self-bound quarks. The restrictions aimed at producing stars with maximum masses...

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...

In this work, we study dark matter (DM) admixed strange quark stars exploring the different possibilities about nature of DM and their effects on macroscopic properties stars, such as maximum masses, radii, well dimensionless tidal parameter. We observe that significantly affects depend its mass, type, fraction inside star.

ABSTRACT Using a quantum hadrodynamics (QHD) and MIT-based models, we construct hybrid stars within the Maxwell criteria of hadron-quark phase transition. We are able to produce star with maximum mass 2.15 M⊙. Furthermore, 2.03-M⊙ quark core corresponding more than $80{{\ \rm per\ cent}}$ both, its total radius, is also possible.

Abstract In this work, we made an extensive study about the possible presence of anisotropies in strange stars. To accomplish task, use three different configurations for matter: unpaired matter, a two-flavor super-conducting (2SC) and fully three-flavor matter (CFL). For each configuration, calculate relevant quantities stars, such as mass-radius relation, dimensionless tidal parameter, moment inertia, surface curvature degrees anisotropies. Whenever possible, compare our results with...

We study how the nuclear symmetry energy slope ($L$) can affect hadron-quark phase transition and neutron star properties. show that main physical quantities as critical chemical potential pressure are strongly influenced by slope. In extreme cases, total amount of deconfined quarks reach up to $99%$ hybrid mass.

Abstract In 2023 December, the Fermi Large Area Telescope Catalog announced discovery of 33 new millisecond pulsars. Motivated by that, in this work, I study how different values symmetry energy slope ( L ) affect properties static and slowly rotating neutron stars. For fixed angular velocity, influences increase maximum mass, radii canonical 1.4 M ⊙ , its eccentricity, as well same quantities for 2.01 show that cause variations not only absolute but also relative ones. Indeed, predict which...

Motivated by the recent gravitational wave detection LIGO-VIRGO observatories, we study Love number and dimensionless tidal polarizability of highly magnetized stars. We also investigate fundamental quasi-normal mode neutron stars subject to high magnetic fields. To perform our calculations use chaotic field approximation consider both nucleonic hyperonic As far as is concerned, conclude that role played constitution more relevant than intensity if massive are considered, ones constituted...

In this work we review the formalism normally used in literature about effects of density-dependent magnetic fields on properties neutron and quark stars, expose some ambiguities that arise propose a way to solve related problem. Our approach explores more deeply concept pressure, yielding so called chaotic field for stress tensor. We also use different introducing variable field, which depends energy density rather than baryonic density, allows us build parameter free model.

Using a extended version of the Quantum Hadrodynamics (QHD), I propose new microscopic equation state (EoS) able to correctly reproduce main properties symmetric nuclear matter at saturation density, as well produce massive neutron stars and satisfactory results for radius tidal parameter $Λ$. show that even when hyperons are present, this EoS is least 2.00 solar masses star. The constraints about $2.00M_\odot$ minimum mass enable direct Urca effect also checked.

Using six different parametrizations of the quantum hadrodynamics (one which is original), I study how values symmetry energy slope ($L)$ affect some microscopic and macroscopic properties neutron stars, such as proton fraction, maximum mass, radius canonical 1.4$M_\odot$ star its dimensionless tidal parameter $\Lambda$. show that while most quantities present same qualitative results, can increase or decrease with slope, depending on model. Moreover, special attention given to minimum mass...

We investigate possible traces of the nuclear symmetry energy slope ($L$) in gravitational wave emission neutron stars. For fixed stellar mass values, we examine how influences radius, compactness, tidal deformability, frequency quadrupole fundamental fluid mode, and damping time mode due to emission. demonstrate that all these physical quantities are sensitive could potentially impose significant constraints on it.

We study how the Λ hyperon threshold influences radius of canonical 1.4 M⊙ neutron star in light measurements found recent literature. show that onset a new degree freedom not only causes well known reduction maximum mass, but also compacts stars with high central density. With help strange mesons ϕ and σ*, we it is possible to simulate very compact keeping realistic potentials, UΛ(n0)= −28 MeV UΛΛ(n0/5) agreement recents measurements. In end generalize these results showing yet dark matter...

Abstract I investigate the use of SU(3) Clebsch–Gordan coefficients in light relations completeness and closure. show that case αV = F/(F + D) ≠ 1, there is an additional interaction: exchange a ρ meson between Λ Σ0 hyperon only affects symmetric coupling. then calculate these coupling constants this recovers closure for all values αV. Besides, it increases symmetry theory, now we can group baryon octet into four doublets. Finally, add new to study numerical results onset dense nuclear...