The properties of strangelets at zero temperature with a new quark model that includes both the confinement and one-gluonexchange interactions is studied in a fully self-consistent method.The charge and parameter depe...The properties of strangelets at zero temperature with a new quark model that includes both the confinement and one-gluonexchange interactions is studied in a fully self-consistent method.The charge and parameter dependence of the stability of strangelets are discussed.It is found that the one-gluon-exchange interaction lowers the energy of a strangelet,and consequently allows the strangelet to be absolutely stable.The stable strangelet radius in the present model is smaller in comparison with the absence of one-gluon-exchange interaction,and can thus be much less than that of a normal nucleus with the same baryon number,according to the strength of the confinement and one-gluon-exchange interactions.展开更多
The conventionally separated treatments for strangelets and strange stars are now unified with a more comprehensive theoretical description for objects ranging from strangelets to strange stars. After constraining the...The conventionally separated treatments for strangelets and strange stars are now unified with a more comprehensive theoretical description for objects ranging from strangelets to strange stars. After constraining the model parameter according to the Witten–Bodmer hypothesis and observational mass–radius probability distribution of pulsars, we investigate the properties of this kind of objects. It is found that the energy per baryon decreases monotonically with increasing baryon number and reaches its minimum at the maximum baryon number, corresponding to the most massive strange star. Due to the quark depletion,an electric potential well is formed on the surface of the quarkpart. For a rotational bare strange star, a magnetic field with the typical strength in pulsars is generated.展开更多
We study the properties of strangelets at finite temperature T,employing an equivparticle model that incorporates both linear confinement and leading-order perturbative interactions with density-dependent quark masses...We study the properties of strangelets at finite temperature T,employing an equivparticle model that incorporates both linear confinement and leading-order perturbative interactions with density-dependent quark masses.The shell effects are analyzed by solving the Dirac equations for quarks within the mean-field approximation.As temperature increases,these effects weaken due to the occupation probability of single-particle levels being governed by the Fermi-Dirac statistics,a phenomenon known as shell dampening.Surprisingly,the surface tension,derived from a liquid-drop formula,does not decrease with temperature but instead rises until it peaks at T≈20-40MeV.At this temperature,shell corrections become negligible,and the formula provides a reasonable approximation for the free energy per baryon of strangelets.However,the curvature term decreases with T despite the presence of shell effects.The neutron and proton emission rates are determined microscopically by the external nucleon gas densities that are in equilibrium with strangelets.These emission rate generally increases with T for stable strangelets,but decrease for those that are unstable to nucleon emission at T=0.The other properties ofβ-stable strangelets obtained with various parameter sets are presented as well.The results indicated in this work are useful for understanding the products of binary compact star mergers and heavy-ion collisions.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.11135011 and 11045006)by the Chinese Academy Sciences Key Project(Grant No.Y12A0A0012)
文摘The properties of strangelets at zero temperature with a new quark model that includes both the confinement and one-gluonexchange interactions is studied in a fully self-consistent method.The charge and parameter dependence of the stability of strangelets are discussed.It is found that the one-gluon-exchange interaction lowers the energy of a strangelet,and consequently allows the strangelet to be absolutely stable.The stable strangelet radius in the present model is smaller in comparison with the absence of one-gluon-exchange interaction,and can thus be much less than that of a normal nucleus with the same baryon number,according to the strength of the confinement and one-gluon-exchange interactions.
基金supported by the National Natural Science Foundation of China (11135011, 11120101005, 11275248, 11475110,11475115, 11575190 and 11525524)the National Key Basic Research Program of China (2013CB834400)+1 种基金the Knowledge Innovation Project of the Chinese Academy of Sciences (KJCX2-EW-N01)supported by the HPC Cluster of SKLTP/ITP-CAS and the Supercomputing Center, CNIC of CAS
文摘The conventionally separated treatments for strangelets and strange stars are now unified with a more comprehensive theoretical description for objects ranging from strangelets to strange stars. After constraining the model parameter according to the Witten–Bodmer hypothesis and observational mass–radius probability distribution of pulsars, we investigate the properties of this kind of objects. It is found that the energy per baryon decreases monotonically with increasing baryon number and reaches its minimum at the maximum baryon number, corresponding to the most massive strange star. Due to the quark depletion,an electric potential well is formed on the surface of the quarkpart. For a rotational bare strange star, a magnetic field with the typical strength in pulsars is generated.
文摘We study the properties of strangelets at finite temperature T,employing an equivparticle model that incorporates both linear confinement and leading-order perturbative interactions with density-dependent quark masses.The shell effects are analyzed by solving the Dirac equations for quarks within the mean-field approximation.As temperature increases,these effects weaken due to the occupation probability of single-particle levels being governed by the Fermi-Dirac statistics,a phenomenon known as shell dampening.Surprisingly,the surface tension,derived from a liquid-drop formula,does not decrease with temperature but instead rises until it peaks at T≈20-40MeV.At this temperature,shell corrections become negligible,and the formula provides a reasonable approximation for the free energy per baryon of strangelets.However,the curvature term decreases with T despite the presence of shell effects.The neutron and proton emission rates are determined microscopically by the external nucleon gas densities that are in equilibrium with strangelets.These emission rate generally increases with T for stable strangelets,but decrease for those that are unstable to nucleon emission at T=0.The other properties ofβ-stable strangelets obtained with various parameter sets are presented as well.The results indicated in this work are useful for understanding the products of binary compact star mergers and heavy-ion collisions.
