强磁场与有限温度下色味锁夸克星的唯象模型研究

初鹏程; 刘玉珩; 刘鹤; 刘宏铭; 杨永杭

doi:10.7498/aps.74.20250451

摘要
本文基于准粒子模型对强磁场和有限温度下色味锁夸克物质与色味锁磁星的性质进行了讨论. 我们发现色味锁夸克物质的每核子自由能、有效质量、每核子熵等物理量受磁场、温度、能隙常数的影响较大, 并且强磁场、有限温度环境中色味锁夸克物质的压强会产生各向异性. 我们进一步研究了不同等熵阶段下的色味锁磁星的性质, 发现色味锁磁星的质量、半径等性质与磁星内部的磁场强度分布、磁场方向分布紧密相关, 磁星内部温度会随着每核子熵的增加而增大. 结论还表明色味锁夸克物质的多方指数会随着色味锁夸克星质量的增大而减少.

关键词:
色味锁态 /

夸克星 /

磁星
Abstract
We investigate the properties of the color-flavor-locked (CFL) quark matter at finite temperature and under strong magnetic fields within quasiparticle model. Our results indicate that the pressure of CFL quark matter may become anisotropic under strong magnetic fields, and the equations of state (EOS) and the equivalent quark mass can be strongly influenced by the temperature, the energy gap constat Δ, and the strong magnetic fields inside the CFL quark matter. The equivalent quark mass of CFL quark matter decreases with the increment of the temperature and magnetic field strength, which implies a inverse magnetic catalysis phenomenon. The results also indicate that the entropy per baryon of the CFL quark matter increases with the temperature and decreases with Δ. Furthermore, we study the properties of the CFL magnetars in different isentropic stages, and the results indicate that the star mass and radius is mainly dependent on the strength and orientation distributions of the magnetic field inside the CFL magnetars. The maximum star mass increases with the entropy per baryon, and the temperature of the star matter increases at the large isentropic stages. Moreover, our results also suggest that the polytropic index of the CFL quark matter decrease with the increment of the star mass.

Keywords:
Color-flavor-locked phase /

Quark star /

Magnetar
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施引文献
图 1 不同温度与能隙常数下色味锁态物质的每核子自由能与横纵向压强随着$ n_B $的变化关系

Fig. 1. The free energy per baryon and pressures of CFL quark matter with $ n_B $ at finite temperature and with different $ \Delta $.

下载: 全尺寸图片幻灯片

图 2 不同温度与能隙常数下u夸克的有效质量随磁感应强度的变化

Fig. 2. The equivalent mass of u quarks as a function of the magnetic field with different temperature and $ \Delta $.

下载: 全尺寸图片幻灯片

图 3 色味锁态下夸克星物质的每核子熵随着不同温度、磁场、能隙常数的变化

Fig. 3. The entropy per baryon of the quark star matter in MCFL state with various temperature, magnetic field, and $ \Delta $.

下载: 全尺寸图片幻灯片

图 4 MCFL下夸克物质的多方指数随磁场、温度、能隙常数的变化规律

Fig. 4. The polytropic index of the MCFL quark star matter as a function of the magnetic field strength, temperature, and $ \Delta $.

下载: 全尺寸图片幻灯片

图 5 不同等熵阶段中的色味锁磁星的质量-半径情况

Fig. 5. The star mass as functions of the radius of the MCFL quark stars along different isentropic stages.

下载: 全尺寸图片幻灯片

图 6 不同等熵阶段下色味锁夸克星内部温度随$ n_B $与磁场的变化

Fig. 6. The temperature of the MCFL quark star matter as functions of $ n_B $ and magnetic field along different isentropic stages.

下载: 全尺寸图片幻灯片

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强磁场与有限温度下色味锁夸克星的唯象模型研究

Properties of color-flavor-locked quark star at finite temperature and under strong magnetic fields

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强磁场与有限温度下色味锁夸克星的唯象模型研究

Properties of color-flavor-locked quark star at finite temperature and under strong magnetic fields

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