Electrically charged strange quark stars with a non-linear equation-of-state

Panotopoulos, Grigoris; Rincón, Ángel

doi:10.1140/epjc/s10052-019-7042-7

Cited by 32 publications

(25 citation statements)

References 52 publications

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“…In recent progress, Ivanov [71] assumed a linear EoS to study charged perfect fluid solutions. Motivated by this results, several authors have studied electrically charged fluid spheres for linear and non-linear EoS [72][73][74][75][76]. Motivated by MIT bag models of strange stars, charged solutions were studied by some authors [77,78].…”

Section: Introductionmentioning

confidence: 99%

Electrically charged quark stars in 4D Einstein–Gauss–Bonnet gravity

Pretel

Pradhan²,

Banerjee³

2022

Eur. Phys. J. C

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In this work we study the properties of compact spheres made of a charged perfect fluid with a MIT bag model EoS for quark matter. Considering static spherically symmetric spacetime we derive the hydrostatic equilibrium equations in the recently formulated four dimensional Einstein–Gauss–Bonnet (4D EGB) gravity theory. In this setting, the modified TOV equations are solved numerically with the aim to investigate the impact of electric charge on the stellar structure. A nice feature of 4D EGB theory is that the Gauss–Bonnet term has a non-vanishing contribution to the gravitational dynamics in 4D spacetime. We therefore analyse the effects of Gauss–Bonnet coupling constant $$\alpha $$ α and the charge fraction $$\beta $$ β on the mass–radius ($$M{-}R$$ M - R ) diagram and also the mass–central density $$(M{-}\rho _c)$$ ( M - ρ c ) relation of quark stars. Finally, we conclude that depending on the choice of coupling constant one could have larger mass and radius compared with GR and can also be relevant for more massive compact objects due to the effect of the repulsive Coulomb force.

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Section: Introductionmentioning

confidence: 99%

Electrically charged quark stars in 4D Einstein–Gauss–Bonnet gravity

Pretel

Pradhan²,

Banerjee³

2022

Eur. Phys. J. C

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“…[32] using a simplified approach (see also Refs. [31,[33][34][35]). Electrically charged hybrid stars were previously studied in Ref.…”

Section: Introductionmentioning

confidence: 99%

Electrically charged supermassive twin stars

2022

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By assuming that ultra dense hybrid neutron stars are endowed with a distribution of electric charge, we study the corresponding twin star solutions and their properties resulting from a sharp first order transition from confined hadronic to a deconfined quark phase. Two distinct quark matter equations of state with increasing stiffness are considered and the values for the maximum gravitational masses of the hadronic and hybrid twin configurations are obtained for different values of the total electric charge. Interestingly, our calculations indicate that sharp transitions make charged twin hybrid stars more massive than their neutral counterparts, and that the $${2}\,{\hbox {M}_{\odot }}$$ 2 M ⊙ constraint from PSR J0740+6620 is surpassed for standard values of electric charge and can be considered stable only satisfying $$\partial M/\partial \epsilon _0 > 0$$ ∂ M / ∂ ϵ 0 > 0 . In particular, our charged stellar models reach masses even higher than the unknown compact object measured in the GW190814 event.

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“…[29][30][31], the surface of a SQS has a high electric field, which can reach about 1 × 10 21 V=m. The results presented in [30][31][32] using the massless version of the MIT bag model and a nonlinear EoS, respectively, have demonstrated that charged stars are heavier than their neutral counterparts, with the increasing in the maximum mass being dependent of the magnitude of the electric charge. As a consequence, the presence of the electric charge can modify the star compactness, given by the ratio between its mass and radii (M=R), which determines tidal deformability.…”

Section: Introductionmentioning

confidence: 99%

Electrically charged strange stars with an interacting quark matter equation of state

Gonçalves

Lazzari

2020

Phys. Rev. D

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The properties of electrically charged strange quark stars predicted by an interacting quark matter equation of state (EoS) based on cold and dense perturbative quantum chromodynamics (pQCD) are investigated. The stability of strange stars is analyzed considering different models for the electric charge distribution inside the star as well as for distinct values for the total electric charge. A comparison with the predictions derived using the MIT bag model is also presented. We show that the presence of a net electric charge inside strange stars is implied in a larger maximum mass in comparison to their neutral counterparts. Moreover, we demonstrate that the pQCD EoS implies larger values for the maximum mass of charged strange stars, with very heavy charged stars being stable systems against radial oscillations. For an electric charge distribution given by qðrÞ ¼ βr 3 , the pQCD EoS implies unstable configurations for large values of the renormalization scale as well as for large values of β, in contrast to the MIT bag model predictions.

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Electrically charged strange quark stars with a non-linear equation-of-state

Cited by 32 publications

References 52 publications

Electrically charged quark stars in 4D Einstein–Gauss–Bonnet gravity

Electrically charged quark stars in 4D Einstein–Gauss–Bonnet gravity

Electrically charged supermassive twin stars

Electrically charged strange stars with an interacting quark matter equation of state

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