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Rapidly Spinning Compact Stars with Deconfinement Phase Transition
The Astrophysical Journal Letters ( IF 8.8 ) Pub Date : 2021-01-29 , DOI: 10.3847/2041-8213/abd853
Tuna Demircik 1, 2 , Christian Ecker 3 , Matti Jrvinen 2, 4
Affiliation  

We study rapidly spinning compact stars with equations of state featuring a first-order phase transition between strongly coupled nuclear matter and deconfined quark matter by employing the gauge/gravity duality. We consider a family of models that allow purely hadronic uniformly rotating stars with masses up to approximately 2.9 M , and are therefore compatible with the interpretation that the secondary component (${2.59}_{-0.09}^{+0.08}\,{M}_{\odot }$) in GW190814 is a neutron star. These stars have central densities that are several times the nuclear saturation density, so that strong coupling and non-perturbative effects become crucial. We construct models where the maximal mass of static (rotating) stars M TOV (M max) is either determined by the secular instability or a phase-transition induced collapse. We find the largest values for M max/M TOV in cases where the phase transition determines M max, which shifts our fit result to ${M}_{\max }/{M}_{\mathrm{TOV}}={1.227}_{-0.016}^{+0.031}$, a value slightly above the Breu–Rezzolla bound ${1.203}_{-0.022}^{+0.022}$ inferred from models without phase transition.



中文翻译:

具有脱限相变的快速自旋恒星

我们通过利用轨距/重力对偶性研究状态方程式快速旋转的紧凑型恒星,该方程式具有强耦合核物质和无约束夸克物质之间的一阶相变。我们认为,一个家庭的模式,使纯粹的强子均匀旋转的恒星与群众多达约2.9中号 ,并因此与解释,即二次成分(兼容$ {2.59} _ {-0.09} ^ {+ 0.08} \,{M} _ {\ odot} $于GW190814)是中子星。这些恒星的中心密度是核饱和密度的几倍,因此强耦合和非扰动效应变得至关重要。我们构建的模型中静态(旋转)恒星的最大质量M TOVM max或由长期不稳定性决定,或由相变引起的坍塌决定。在相变确定M max的情况下,我们找到了M max / M TOV的最大值,这将我们的拟合结果偏移到,该值略高于从没有相变模型推断出的Breu-Rezzolla界。 $ {M} _ {\ max} / {M} _ {\ mathrm {TOV}} = {1.227} _ {-0.016} ^ {+ 0.031} $$ {1.203} _ {-0.022} ^ {+ 0.022} $

更新日期:2021-01-29
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