With the first multi‐messenger observation of a binary neutron star merger (GW170817), new constraints became available for masses and radii of neutron stars. We introduce a class of hybrid EoS that fulfills all these constraints and predicts a region in the mass‐radius diagram that could be populated only by hybrid neutron stars with quark matter cores. A confirmation of this conjecture would be provided when the NICER radius measurement for the high‐mass pulsar PSR J0740 + 6620 yields a radius significantly less than 11 km. Would this radius measurement yield a result in excess of 12 km, this would allow for both, a purely hadronic and a hybrid nature of this star. In the latter case, the maximum mass could reach 2.6 M_⊙ so that the lighter object in the asymmetric binary merger GW190814 could have been a hybrid star. We demonstrate that this high mass can be compatible with an early onset of deconfinement for stars with masses below 1 M_⊙ and the occurrence of low‐mass twin stars. In such a case, the remnant of GW170817 could be a long‐lived hypermassive pulsar.

中文翻译：

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用中子星的多信使天文研究解除conf陷的开始

随着对双星中子星合并（GW170817）的首次多信使观测，对中子星的质量和半径提供了新的约束。我们引入一类混合EoS，它可以满足所有这些约束条件，并在质量半径图中预测一个区域，该区域只能由具有夸克物质核的混合中子星构成。当高质量脉冲星PSR J0740 + 6620的NICER半径测量得出的半径明显小于11 km时，将提供这一推测的证实。半径测量结果是否会超过12 km，这将使该恒星具有纯强子和混合性质。在后一种情况下，最大质量可达到2.6 中号_⊙因此，非对称双星合并GW190814中的较轻物体可能是混合星。我们表明，这种高的质量可与禁闭的早期发生的恒星低于群众兼容1 中号_⊙和低质量双星的发生。在这种情况下，GW170817的残留物可能是长寿命的超大规模脉冲星。