Understanding the equation of state of cold dense matter,i.e.,those inside neutron stars,is a key problem in the multi-messenger astronomical era.In order to facilitate the scientific discussions between different com...Understanding the equation of state of cold dense matter,i.e.,those inside neutron stars,is a key problem in the multi-messenger astronomical era.In order to facilitate the scientific discussions between different commu-nities in the relevant fields,particularly between nuclear physicists and astrophysicists,we have organized the Dialo-gue at the Dream Field(DDF2024).The participants explored topics of various fields such as pulsar astrophysics,transient phenomena,hadronic and nuclear matter,supra-nuclear matter with quark degree of freedom,numerical relativity.This involved discussions on the mechanisms,model constructions,observational impacts,and introduc-tions of new facilities.In-depth exchanges were carried out through invited talks and free discussions,as well as a visit to view the FAST telescope.展开更多
Based on the relativistic mean field(RMF)model with Thomas-Fermi approximation,we investigate the elastic properties of neutron star matter.The elastic constants are estimated by introducing deformations on the nuclea...Based on the relativistic mean field(RMF)model with Thomas-Fermi approximation,we investigate the elastic properties of neutron star matter.The elastic constants are estimated by introducing deformations on the nuclear pasta structures inβ-equilibrium,where various crystalline configurations are considered in a fully three-dimensional geometry without the Wigner-Seitz approximation.Two scenarios with different symmetry energy slope(L=41.34 and 89.39 MeV)are examined,where the the elastic constants can vary by ten times.By fitting to the numerical results,we improve the analytic formulae for the elastic properties of nuclear pasta by introducing damping factors.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
文摘Understanding the equation of state of cold dense matter,i.e.,those inside neutron stars,is a key problem in the multi-messenger astronomical era.In order to facilitate the scientific discussions between different commu-nities in the relevant fields,particularly between nuclear physicists and astrophysicists,we have organized the Dialo-gue at the Dream Field(DDF2024).The participants explored topics of various fields such as pulsar astrophysics,transient phenomena,hadronic and nuclear matter,supra-nuclear matter with quark degree of freedom,numerical relativity.This involved discussions on the mechanisms,model constructions,observational impacts,and introduc-tions of new facilities.In-depth exchanges were carried out through invited talks and free discussions,as well as a visit to view the FAST telescope.
文摘Based on the relativistic mean field(RMF)model with Thomas-Fermi approximation,we investigate the elastic properties of neutron star matter.The elastic constants are estimated by introducing deformations on the nuclear pasta structures inβ-equilibrium,where various crystalline configurations are considered in a fully three-dimensional geometry without the Wigner-Seitz approximation.Two scenarios with different symmetry energy slope(L=41.34 and 89.39 MeV)are examined,where the the elastic constants can vary by ten times.By fitting to the numerical results,we improve the analytic formulae for the elastic properties of nuclear pasta by introducing damping factors.
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.
