We analyze the impact of several multiquark interaction channels on the properties of hybrid stars. Four and eight vector interactions were included in the $SU(3)$ Nambu–Jona-Lasinio model to describe the quark matter, and all vectorlike interactions were investigated. The hybrid stars were built starting from an hadronic equation of state that satisfy presently accepted nuclear matter properties and considering the quark model constrained by the vacuum properties of several light mesons. The interplay between the eight-quark vector interaction and the four-quark isovector-vector interaction determine the size of the quark core and its strangeness content. The inclusion of a isovector-vector interaction is essential to obtain large $s$-quark contents and a smaller central speed of sound, although this interaction pushes the onset of quarks to larger densities. It is observed that low mass stars, with a mass below $1.4M_{\odot }$, may contain a quark core but with a small strangeness content. It is shown that the presently existing mass and tidal deformability constraints from neutron stars observations allow for the existence of hybrid stars with a large strangeness content and large quark cores for binary mass ratios $q=M_2/M_1\gtrsim 0.85$.

中文翻译：

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由 GW170817 约束的具有大型奇异夸克核的混合星

我们分析了几个多夸克相互作用通道对混合恒星特性的影响。四个和八个矢量相互作用包括在$秒你(3)$Nambu-Jona-Lasinio 模型来描述夸克物质，并研究了所有类似矢量的相互作用。混合星是从满足目前公认的核物质特性的强子状态方程开始构建的，并考虑到受几个轻介子真空特性约束的夸克模型。八夸克矢量相互作用和四夸克等矢量-矢量相互作用之间的相互作用决定了夸克核的大小及其奇异含量。包含同种载体-载体相互作用对于获得大的$秒$-夸克含量和较小的中心声速，尽管这种相互作用将夸克的出现推向更大的密度。据观察，质量低于$1.4{米}_{\odot }$, 可能包含一个夸克核，但具有很小的奇异含量。结果表明，目前中子星观测中存在的质量和潮汐变形性约束允许存在具有大奇异含量和大夸克核的混合星的二元质量比$q={米}_2/{米}_1\gtrsim 0.85$.