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arXiv 0710.3874astro-phcond-mat.supr-conhep-phnucl-th
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非旋转和快速旋转晶色超导混合星的平衡序列

Equilibrium sequences of non rotating and rapidly rotating crystalline color superconducting hybrid stars

Nicola Ippolito, Marco Ruggieri, Dirk Rischke, Armen Sedrakian, Fridolin Weber

摘要:

量子色动力学(QCD)中的三味结晶色超导(CCS)相是中等密度冷物质基态的候选相,其密度高于退禁闭相变的密度。除了是超流体之外,CCS相还具有固体的性质,例如晶格结构和剪切模量,因此能够在重力平衡中维持多极变形。我们构造了由低密度的核物质和高密度的CCS夸克物质组成的混合星的平衡构型。只有当核物质的状态方程很硬,且在描述CCS状态的Nambu-Jona-Lasinio拉格朗日量中存在大的耦合时,这些相之间才可能达到相平衡。我们确定了一个新的分支的稳定CCS混合恒星在一个广泛的范围内的中心密度,这取决于状态方程的细节,无论是从恒星的核序列分叉时,中心密度超过了解除限制相变或形成一个新的家庭的配置分离的纯核序列的不稳定区域。我们的非旋转的混合配置的最大质量是与目前可用的天文界。发现在质量脱落极限附近旋转的混合配置的序列更紧凑,从而比它们的相同质量的核对应物支持大得多的自旋。

英文摘要:

The three-flavor crystalline color-superconducting (CCS) phase of quantum chromodynamics (QCD) is a candidate phase for the ground state of cold matter at moderate densities above the density of the deconfinement phase transition. Apart from being a superfluid, the CCS phase has properties of a solid, such as a lattice structure and a shear modulus, and hence the ability to sustain multipolar deformations in gravitational equilibrium. We construct equilibrium configurations of hybrid stars composed of nuclear matter at low, and CCS quark matter at high, densities. Phase equilibrium between these phases is possible only for rather stiff equations of state of nuclear matter and large couplings in the effective Nambu--Jona-Lasinio Lagrangian describing the CCS state. We identify a new branch of stable CCS hybrid stars within a broad range of central densities which, depending on the details of the equations of state, either bifurcate from the nuclear sequence of stars when the central density exceeds that of the deconfinement phase transition or form a new family of configurations separated from the purely nuclear sequence by an instability region. The maximum masses of our non-rotating hybrid configurations are consistent with the presently available astronomical bounds. The sequences of hybrid configurations that rotate near the mass-shedding limit are found to be more compact and thus support substantially larger spins than their same mass nuclear counterparts.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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