Proto-strange quark star structure

Bordbar, G. H.; Sadeghi, Fatemeh; Kayanikhoo, Fatemeh; Poostforush, A.

doi:10.1007/s12648-020-01770-y

Cited by 7 publications

(7 citation statements)

References 26 publications

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“…Some of the examples are: MIT bag model [36,37], Dyson-Schwinger equation approach [38][39][40][41], quark meson coupling (QMC) model [42], quark mass density dependent (QMDD) model [43][44][45][46][47], Nambu-Jona-Lasinio (NJL) model [37,48], confined density dependent quark mass (CDDM) model [8,49,50], chiral SU(3) quark mean field (CQMF) model [51,52], Polyakov quark meson coupling (PQMC) model [53,54] and Polyakov extended NJL (PNJL) model [55][56][57]. Many authors have studied the properties of pure SQM in β-equilibrium [58-61], proto-strange quark stars (PSQS) [62][63][64][65][66][67], as well as hybrid star with SQM in the core [68,69] (also, see references therein).…”

Section: (): V-volmentioning

confidence: 99%

“…Their results show that the QMDD model always reproduces massive stars than the MIT bag model due to the additional terms appearing in the thermodynamical potential. Bordbar et al investigated the properties of SQSs considering the impact of finite entropy and temperature using MIT bag model [63] and NJL model [103]. It was concluded that the maximum mass and the radius of stars decreases with an increase in entropy, whereas an increment is observed as a function of temperature.…”

Section: Properties Of Strange Quark Stars (Sqss)mentioning

confidence: 99%

“…Finally, we present the results on the gravitational redshift, Z , defined through the relation [63]…”

Section: Properties Of Strange Quark Stars (Sqss)mentioning

confidence: 99%

“…In Ref. [63], authors have studied the gravitational redshift using the MIT bag model for both fixed and density-dependent bag constant. They found…”

Section: Properties Of Strange Quark Stars (Sqss)mentioning

confidence: 99%

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Properties of strange quark matter and strange quark stars

Kumari

Kumar

2021

Eur. Phys. J. C

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A Polyakov chiral $$\text {SU(3)}$$ SU(3) quark mean-field (PCQMF) model is applied to study the properties of strange quark matter (SQM) and strange quark star (SQS) in $$\beta $$ β -equilibrium. The effect of increasing the strength of vector interactions on the effective constituent quark mass, particle fractions, and the thermodynamical properties such as pressure, energy density, and the speed of sound is investigated. We investigate the above properties for the SQM relevant for various stages of star evolution, i.e., considering with/without trapped neutrinos and zero/finite entropy. The finite lepton fraction and the entropy of the medium is observed to cause the stiffness in the equation of state (EoS). Finally, we calculate the mass-radius relation and the dimensionless tidal deformability within the present model calculations and compare the results to the recent studies.

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Section: (): V-volmentioning

confidence: 99%

Section: Properties Of Strange Quark Stars (Sqss)mentioning

confidence: 99%

“…Finally, we present the results on the gravitational redshift, Z , defined through the relation [63]…”

Section: Properties Of Strange Quark Stars (Sqss)mentioning

confidence: 99%

“…In Ref. [63], authors have studied the gravitational redshift using the MIT bag model for both fixed and density-dependent bag constant. They found…”

Section: Properties Of Strange Quark Stars (Sqss)mentioning

confidence: 99%

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Properties of strange quark matter and strange quark stars

Kumari

Kumar

2021

Eur. Phys. J. C

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“…Therefore it often taken as a free parameter whose value has a wide variation in literature. In the present work, the effective bag constant B(ρ) is considered to have density dependence, following an Gaussian distribution as in [60,61,62,63]. As the density increases, a deconfinement transition from hadron to quarks is expected which will imply the vanishing of the difference between the perturbative and the non-perturbative (true) vacuum and hence the bag pressure B should also vanish.…”

Section: Introductionmentioning

confidence: 99%

Properties of Hybrid Stars with Density Dependent Bag Model

Sen,

Alam,

Chaudhuri

2021

Preprint

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The phenomena of deconfinement of hadronic matter into quark matter at high density, relevant to hybrid star (HS) cores, is studied in the present work. The effective chiral model describes the pure hadronic phase while for the quark phase the MIT bag model is chosen with density dependent bag pressure. Phase transition is achieved using Maxwell construction. The effect of variation of the asymptotic value of the bag pressure (B as ) is analyzed w.r.t to the mass and radius of the HSs. The presence of hyperons in the hadronic sector also has significant effect on the choice of the value of B as . Both the hadronic composition and the choice of B as significantly affect the stability of the star. The gross structural properties of the resultant HS are calculated in static condition and compared with the various constraints on them from different observational and empirical perspectives. The static properties like the maximum gravitational mass of the HS, obtained with B as =80 MeV fm −3 , is consistent with the limits imposed from the observational analysis of PSR J0348+0432 and PSR J0740+6620. The estimates of R 1.4 and R 1.6 of HSs are found to be within the range prescribed from GW170817 analysis. Also the M − R solutions of the HSs are in excellent agreement with the recently obtained NICER data for PSR J0030+0451. The results of maximum surface redshift, obtained with hybrid equation of state, satisfy the constraints from 1E 1207.4-5209 and RX J0720.4-3125. The work is also extended to obtain the tidal deformation properties of the HSs. The obtained value of Λ 1.4 is consistent with the bound obtained from GW170817 data analysis.

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