Modern compact star observations and the quark matter equation of state
Modern compact star observations and the quark matter equation of state
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DOI：
10.1016/j.physletb.2007.08.048
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发表时间：
2006-09
影响因子：
4.4
通讯作者：
T. Klahn;D. Blaschke;Fredrik Sandin;C. Fuchs;A. Faessler;H. Grigorian;G. Ropke;J. Trumper
中科院分区：
文献类型：
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作者：
T. Klahn;D. Blaschke;Fredrik Sandin;C. Fuchs;A. Faessler;H. Grigorian;G. Ropke;J. Trumper
我们提出了一个稠密物质的混合状态方程(EOS)，它满足现代致密恒星(CS)观测的唯象约束，这些观测表明高最大质量(M∼2M⊙)和大半径(R>；12公里)。相应的同位旋对称状态方程与∼-0.55fm-−3重离子碰撞和退禁闭跃迁的流动数据分析相一致。夸克物质相由一个三味Nambu-Jona-Lasinio模型描述，该模型考虑了标量双夸克凝聚和矢量介子相互作用，而核物质相是在Dirac-Brueckner-Hartree-Fock方法下用波恩-A势得到的。我们证明了纯中子星和具有夸克物质核的中子星与现代CS观测是一致的。在本模型中，具有CFL夸克核的混合星组态是不稳定的。
We present a hybrid equation of state (EoS) for dense matter that satisfies phenomenological constraints from modern compact star (CS) observations which indicate high maximum masses (M∼2M⊙) and large radii (R>12 km). The corresponding isospin symmetric EoS is consistent with flow data analyses of heavy-ion collisions and a deconfinement transition at ∼0.55 fm−3. The quark matter phase is described by a 3-flavor Nambu–Jona-Lasinio model that accounts for scalar diquark condensation and vector meson interactions while the nuclear matter phase is obtained within the Dirac–Brueckner–Hartree–Fock (DBHF) approach using the Bonn-A potential. We demonstrate that both pure neutron stars and neutron stars with quark matter cores are consistent with modern CS observations. Hybrid star configurations with a CFL quark core are unstable within the present model.