CFL色超导能隙对混合星性质的影响

Effects of Energy Gap of CFL Color Superconductivity on Properties of Hybrid Stars

用相对论平均场理论(RMFT)描述强子物质,用MIT口袋模型描述色味锁闭(CFL)色超导夸克物质,用GL85,GL1和NL3参数组考察CFL色超导能隙(Δ)对混合星性质的影响.结果表明:随着Δ的增加,混合星的最大质量和半径分布在3个区域,强子星区(Δ<76MeV)、中间相变过渡区域(76 MeV≤Δ<160 MeV)与CFL色超导夸克星区(160MeV≤Δ≤200MeV);随着Δ的增加,混合星内强子-CFL夸克相变的相变密度变小,相变区域变窄,状态方程(EOS)先变软后变硬,星体的最大质量先减小后增加;GL85和GL1参数组研究CFL色超导能隙对混合星性质的影响规律一致;NL3参数组在较小能隙(Δ<30MeV)可获得PSR J1614-2230中子星.

We used relativistic mean field theory(RMFT)to describe hadronic matter,MIT bag model to describe color-flavor-locked(CFL)color superconducting quark matter,and the GL85,GL1,NL3 parameter groups to investigate the effect of the energy gap(Δ)of the CFL color superconductivity on the property of hybrid star.The results show that with the increase of theΔ,the maximum mass and radius of hybrid star is distributed in three regions:hadron star region(Δ<76 MeV)、intermadiate transition region(76 MeV≤Δ<160 MeV)、CFL color superconducting quark star region(160 MeV≤Δ≤200 MeV).With the increase ofΔ,the phase transition density of hardon-CFL quark transition in hybrid stars decreases,and phase transition region narrows,the equation of state(EOS)softens first,then stiffens,and the maximum mass of stars decreases firstly and then increases.The influence of the energy gap of CFL color superconductivity on the properties of hybrid stars studied by GL85 and GL1 parameter groups is consistent.The neutron star PSR J1614-2230 can be obtained by NL3 parameter group in small energy gap(Δ<30 MeV).