We investigated the properties of strange quark matter in an external strong magnetic field with both confinement and leading-order perturbative interactions considered. It was found that the leading-order perturbativ...We investigated the properties of strange quark matter in an external strong magnetic field with both confinement and leading-order perturbative interactions considered. It was found that the leading-order perturbative interaction can stiffen the equation of state of magnetized quark matter, while the magnetic field lowers the minimum energy per baryon. By solving the Tolman–Oppenheimer–Volkoff equations, we obtain the internal structure of strange stars. The maximum mass of strange stars can be as large as 2 times the solar mass.展开更多
The properties of color-flavor locked strange quark matter in an external strong magnetic field are investigated in a quark model with density-dependent quark masses.Parameters are determined by stability arguments.It...The properties of color-flavor locked strange quark matter in an external strong magnetic field are investigated in a quark model with density-dependent quark masses.Parameters are determined by stability arguments.It is found that the minimum energy per baryon of the color-flavor locked(MCFL)matter decreases with increasing magnetic-field strength in a certain range,which makes MCFL matter more stable than other phases within a proper magnitude of the external magnetic field.However,if the energy of the field itself is added,the total energy per baryon will increase.展开更多
Since the conjecture of Witten that strange quark matter (SQM) would be more stable than the normal nuclear matterin is got, much theoretical effort has been directed toward the investigation of its properties and app...Since the conjecture of Witten that strange quark matter (SQM) would be more stable than the normal nuclear matterin is got, much theoretical effort has been directed toward the investigation of its properties and applications.Many effective models reflecting the characteristics of the strong interaction are used to study the SQM. They include the MIT bag model,the quark meson coupling(QMO) model,展开更多
Considering the effect of one-gluon-exchange interaction between quarks,the color-flavor locked strange quark matter and strange stars are investigated in a new quark mass density-dependent model.It is found that the ...Considering the effect of one-gluon-exchange interaction between quarks,the color-flavor locked strange quark matter and strange stars are investigated in a new quark mass density-dependent model.It is found that the color-flavor locked strange quark matter can be more stable if the one-gluon-exchange effect is included.The lower density behavior of the sound velocity in this model is different from the previous results.Moreover,the new equation of state leads to a heavier acceptable maximum mass,supporting the recent observation of a compact star mass as large as about 2 times the solar mass.展开更多
The running of the QCD coupling in the effective mass causes thermodynamic inconsistency problem in the conventional quasiparticle model. We provide a novel treatment which removes the inconsistency by an effective ba...The running of the QCD coupling in the effective mass causes thermodynamic inconsistency problem in the conventional quasiparticle model. We provide a novel treatment which removes the inconsistency by an effective bag constant. The chemical potential dependence of the renormalization subtraction point is constrained by the Cauchy condition in the chemical potential space. The stability and microscopic properties of strange quark matter are then studied within the completely self-consistent quasiparticle model, and the obtained equation of state of quark matter is applied to the investigation of strange stars. It is found that our improved model can describe well compact stars with mass about two times the solar mass, which indicates that such massive compact stars could be strange stars.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11135011,11475110,and 11575190)
文摘We investigated the properties of strange quark matter in an external strong magnetic field with both confinement and leading-order perturbative interactions considered. It was found that the leading-order perturbative interaction can stiffen the equation of state of magnetized quark matter, while the magnetic field lowers the minimum energy per baryon. By solving the Tolman–Oppenheimer–Volkoff equations, we obtain the internal structure of strange stars. The maximum mass of strange stars can be as large as 2 times the solar mass.
基金Supported by National Natural Science Foundation of China(Nos.11135011 and 11475110)
文摘The properties of color-flavor locked strange quark matter in an external strong magnetic field are investigated in a quark model with density-dependent quark masses.Parameters are determined by stability arguments.It is found that the minimum energy per baryon of the color-flavor locked(MCFL)matter decreases with increasing magnetic-field strength in a certain range,which makes MCFL matter more stable than other phases within a proper magnitude of the external magnetic field.However,if the energy of the field itself is added,the total energy per baryon will increase.
基金Supported by Chinese Academy of Sciences Knowledge Innovation Project (KJCX2-SW-No2)National Natural Science Foundation of China(1043508010575123)
文摘Since the conjecture of Witten that strange quark matter (SQM) would be more stable than the normal nuclear matterin is got, much theoretical effort has been directed toward the investigation of its properties and applications.Many effective models reflecting the characteristics of the strong interaction are used to study the SQM. They include the MIT bag model,the quark meson coupling(QMO) model,
基金support from the National Natural Science Foundation of China (Grant Nos.11135011 and 11045006)the Key Project of Chinese Academy of Sciences (No.Y12A0A0012)
文摘Considering the effect of one-gluon-exchange interaction between quarks,the color-flavor locked strange quark matter and strange stars are investigated in a new quark mass density-dependent model.It is found that the color-flavor locked strange quark matter can be more stable if the one-gluon-exchange effect is included.The lower density behavior of the sound velocity in this model is different from the previous results.Moreover,the new equation of state leads to a heavier acceptable maximum mass,supporting the recent observation of a compact star mass as large as about 2 times the solar mass.
基金supported by the National Natural Science Foundation of China(Grant Nos.11135011,11475110 and 11575190)
文摘The running of the QCD coupling in the effective mass causes thermodynamic inconsistency problem in the conventional quasiparticle model. We provide a novel treatment which removes the inconsistency by an effective bag constant. The chemical potential dependence of the renormalization subtraction point is constrained by the Cauchy condition in the chemical potential space. The stability and microscopic properties of strange quark matter are then studied within the completely self-consistent quasiparticle model, and the obtained equation of state of quark matter is applied to the investigation of strange stars. It is found that our improved model can describe well compact stars with mass about two times the solar mass, which indicates that such massive compact stars could be strange stars.
