色味锁夸克物质与夸克星  

Quark matter and quark star in color-flavor-locked phase

作　　者：初鹏程 刘鹤 杜先斌 Chu Peng-Cheng;Liu He;Du Xian-Bin(School of Science,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学理学院,青岛266033

出　　处：《物理学报》2024年第5期75-84,共10页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11975132,12205158,11505100);山东省自然科学基金(批准号:ZR2022JQ04,ZR2021QA037,ZR2019YQ01)资助的课题.

摘　　要：讨论了零温、强磁场下基于准粒子模型的奇异夸克物质、色味锁夸克物质的热力学性质.结果表明色味锁夸克物质比奇异夸克物质更稳定,压强会随着色味锁态能隙常数的增大而增加.并且发现强磁场下磁星的最大质量会随着色味锁夸克物质的能隙常数的增加而增加,磁星的潮汐形变率会随着能隙常数的增加而增加,磁星最大质量的中心密度会随着能隙常数的增加而降低.结果还说明考虑色味锁态得到的磁星质量半径关系可以满足最近实验观测PSR J0740+6620,PSR J0030+0451,和HESS J1731-347所给出的质量半径约束.In this work,we investigate the thermodynamical properties of strange quark matter(SQM)and color-flavor-locked(CFL)quark matter under strong magnetic fields by using a quasiparticle model.We calculate the energy density and the corresponding anisotropic pressure of both SQM and CFL quark matter.Our results indicate that CFL quark matter exhibits greater stability than the SQM,and the pressure of CFL quark matter increases with the energy gap constantΔincreasing.We also observe that the oscillation effects coming from the lowest Landau level can be reduced by increasing the energy gap constantΔ,which cannot be observed in SQM under a similar strong magnetic field.The equivalent quark mass for u,d,and s quark and the chemical potential for each flavor of quarks decrease with the energy gap constantΔincreasing,which matches the conclusion that CFL quark matter is more stable than SQM.From the calculations of the magnetars with SQM and CFL quark matter,we find that the maximum mass of magnetars increases with the energy gap constantΔincreasing for both the longitudinal and the transverse orientation distribution of magnetic field.Additionally,the tidal deformability of the magnetars increases with theΔincreasing.On the other hand,the central baryon density of the maximum mass of the magnetars decreases with theΔincreasing.The results also indicate that the mass-radius lines of the CFL quark star can also satisfy the new estimates of the mass-radius region from PSR J0740+6620,PSR J0030+0451,and HESS J1731-347.

关 键 词：夸克物质 夸克星 磁星 

分 类 号：O572.33[理学—粒子物理与原子核物理]