Finite temperature calculations for the bulk properties of a strange star using a many-body approach

Bordbar, G. H.; Poostforush, A.; Zamani, Ali

doi:10.1007/s10511-011-9178-5

Cited by 17 publications

(12 citation statements)

References 31 publications

(45 reference statements)

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“…We have calculated the thermodynamic properties and structure of SQS at finite temperature using MIT bag model with the fixed bag constant and density-dependent bag constant [18]. It has been shown that the EOS of the system in both cases (fixed bag constant and density-dependent bag constant) becomes stiffer by increasing temperature.…”

Section: Mass Of Sqsmentioning

confidence: 99%

“…In recent years, we have investigated the thermodynamic properties of SQM and structure of SQS under different conditions using these frameworks. We have computed the structural properties of SQS at zero and finite temperatures, as well as the structure of a magnetized SQS using the MIT bag model with the fixed and density dependent bag constants at zero and finite temperatures in the presence and absence of magnetic fields [17][18][19][20][21]. We have also computed the maximum gravitational mass and other structural properties of a neutron star with a quark core at zero [22] and finite temperatures [23].…”

Section: Introductionmentioning

confidence: 99%

“…Their results show that investigation of the proto-quark star gives different behavior for massradius results as the function of temperature by MIT bag model. Where they have considered the same conditions as in Ref [18],. different behavior has been achieved for mass and radius in the temperature range.…”

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confidence: 99%

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Structure of Hot Strange Quark Stars: an NJL Model Approach at Finite Temperature

et al. 2019

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In this paper, we investigated the thermodynamic properties of strange quark matter using Nambu-Jona-Lasinio (NJL) model at finite temperatures where we considered the dynamical mass as the effective interaction between quarks. By considering the pressure of strange quark matter (SQM) at finite temperatures, we showed that the equation of state of this system gets stiffer by increasing temperature. In addition, we investigated the energy conditions and stability of the equation of state and showed that the equation of state of SQM satisfy the conditions of stability.Finally, we computed the structure properties of hot strange quark stars (SQS) including the gravitational mass, radius, Schwarzschild radius, average density, compactness and gravitational redshift. Our calculations showed that in this model, the maximum mass and radius of SQS increase by increasing temperature. Furthermore it was shown that the average density of SQS is greater than the normal nuclear density, and it is an increasing function of temperature. We also discussed the temperature dependence of the maximum gravitational mass calculated from different methods.

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Section: Mass Of Sqsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure of Hot Strange Quark Stars: an NJL Model Approach at Finite Temperature

et al. 2019

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“…They investigated the thermodynamic properties and structure of cold polarized SQS [21,22] and the magnetized SQS at the finite temperature [23,24]. In addition, Non-polarized SQS using MIT bag model and NJL model have been investigated [25][26][27]. Furthermore, papers have been published to investigate properties of neutron stars with the quark core [28,29].…”

Section: Introductionmentioning

confidence: 99%

Influence of strong magnetic field on the structure properties of strange quark stars

2020

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We investigate the thermodynamic properties of strange quark matter under the strong magnetic field in the framework of the MIT bag model in two cases of bag constants. We consider two cases of the magnetic field, the uniform magnetic field and the density-dependent magnetic field to calculate the equation of state of strange quark matter. For the case of density-dependent magnetic field, we use a Gaussian equation with two free parameters β and θ and use two different sets of the parameters for the magnetic field changes (a slow and a fast decrease of the magnetic field from the center to the surface). Our results show that the energy conditions based on the limitation of the energy-momentum tensor, are satisfied in the corresponding conditions. We also show that the equation of state of strange quark matter becomes stiffer by increasing the magnetic field.In this paper, we also calculate the structure parameters of a pure strange quark star using the equation of state. We investigate the compactification factor (2M/R) and the surface redshift of star in different conditions. The results show that the strange quark star is denser than the neutron star and it is more compact in the presence of the stronger magnetic field. As another result, the compactification factor increases when we use a slow increase of the magnetic field from the surface to the center. Eventually, we compare our results with the observational results for some strange star candidates, and we find that the structure of the strange star candidates is comparable to that of the star in our model.

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“…In recent years, we have applied the MIT bag model to investigate the cold and hot strange quark star. For example we consider MIT bag model with a density dependent bag constant for a hot strange star in [14], and found that the mass and radius of strange star decreases when temperature increases. We have also found that a higher mass and radius will be obtained for a density dependent bag constant compare to a fixed bag constant.…”

Section: Introductionmentioning

confidence: 99%

The Structure of Cold Neutron Star With a Quark Core Within the MIT and NJL Models

Yazdizadeh

Bordbar

2019

Iran J Sci Technol Trans Sci

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Neutron star due to their high interior matter density are expected to be composed of a quark core, a mixed quark-hadron matter, and a layer of hadronic matter. Thus, in this paper, we compute the equation of state of these parts of neutron star to evaluate its structure properties.We use two models for describing EOS of quark matter, NJL and MIT bag models, and employ three approaches in this work. A density dependent bag constant satisfy the quark confinement in the simple MIT bag model. We also study the interaction behavior of quarks, firstly one gluon exchange within MIT bag model and the secondly dynamical mass will be held as effective interaction that roles between particles. Density dependence of quark mass is obtained from NJL self consistent model. NJL model is a effective manner for justify the chiral symmetry. Applying the Gibbs conditions the equation of state of the quarks and hadrons mixed phase is obtained. Since the hadronic matter is under the influence of strong force of nucleons, we calculate the equation of state of this phase using a powerful variational many-body technique. Finally, we calculate the mass and radius of a cold neutron star with a quark core by numerically solving the TOV equation.To check our used EOS, we compare our results with the recent observational data. Our results are in a good agreement with some observed compact objects such as SAXJ1748.9−2021, 4U 1608−52 and V elaX − 1.

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Finite temperature calculations for the bulk properties of a strange star using a many-body approach

Cited by 17 publications

References 31 publications

Structure of Hot Strange Quark Stars: an NJL Model Approach at Finite Temperature

Structure of Hot Strange Quark Stars: an NJL Model Approach at Finite Temperature

Influence of strong magnetic field on the structure properties of strange quark stars

The Structure of Cold Neutron Star With a Quark Core Within the MIT and NJL Models

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