College of Bioresource Sciences, Nihon University, Kanagawa 252-0880, Japan.
Phys Rev Lett. 2013 Sep 13;111(11):112503. doi: 10.1103/PhysRevLett.111.112503.
Quark mass dependence of the equation of state (EOS) for nucleonic matter is investigated, on the basis of the Brueckner-Hartree-Fock method with the nucleon-nucleon interaction extracted from lattice QCD simulations. We observe saturation of nuclear matter at the lightest available quark mass corresponding to the pseudoscalar meson mass ≃469 MeV. Mass-radius relation of the neutron stars is also studied with the EOS for neutron-star matter from the same nuclear force in lattice QCD. We observe that the EOS becomes stiffer and thus the maximum mass of neutron star increases as the quark mass decreases toward the physical point.
我们基于格点 QCD 模拟提取的核子-核子相互作用的 Brueckner-Hartree-Fock 方法，研究了夸克物质的状态方程（EOS）对夸克质量的依赖性。我们观察到在最轻的可用夸克质量（对应于赝标介子质量≈469 MeV）处，核物质达到饱和。我们还使用相同格点 QCD 核力的中子星物质的 EOS 研究了中子星的质量-半径关系。我们观察到，随着夸克质量向物理点减小，EOS 变得更加刚性，因此中子星的最大质量增加。
