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Properties of strange quark matter and strange quark stars

The European Physical Journal C, 2021

A Polyakov chiral \text {SU(3)}SU(3)quarkmean−field(PCQMF)modelisappliedtostudythepropertiesofstrangequarkmatter(SQM)andstrangequarkstar(SQS)inSU(3) quark mean-field (PCQMF) model is applied to study the properties of strange quark matter (SQM) and strange quark star (SQS) inSU(3)quarkmean−field(PCQMF)modelisappliedtostudythepropertiesofstrangequarkmatter(SQM)andstrangequarkstar(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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Compact strange stars with a medium dependence in gluons at finite temperature

Astronomy & Astrophysics, 2006

The possible existence of strange stars in the universe will help in the understanding of various properties of quantum chromodynamics, like asymptotic freedom and chiral symmetry restoration, which is otherwise very difficult to prove in laboratory experiments. Strange star properties were calculated using large NcN_cNc approximation with built-in chiral symmetry restoration. A relativistic Hartree Fock calculation was performed using the Richardson potential as an interquark interaction. This potential has the asymptotic freedom and a confinement-deconfinement mechanism built into it and the present calculation employs an application of this potential with modified two scale parameters Lambda\LambdaLambda and Lambdaprime\Lambda^{\prime}Lambdaprime, to find a new set of equations of state for strange quark matter. The linear confinement string tension from lattice calculations is 350 MeVMeVMeV and the Coulomb -like part has the parameter 100 MeVMeVMeV from deep inelastic scattering experiments. We also consider the effect of temperature, TTT, on gluon mass in a simple way, in addition to the usual density dependence, and find that the transition TTT from hadronic matter to strange matter is at 80 MeV, close to the 100 MeV estimated in litarature. Therefore formation of strange stars may be the only signal for formation of quark-gluon plasma with asymptotic freedom and chiral symmetry restoration and this may be observable through many processes -such as for example through delayed gamma\gammagamma ray afterglow.

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Incompressibility of strange matter (original) (raw)

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