早期中子星和夸克物质

夸克禁闭的解除与夸克物质的存在一直是物理学家极感兴趣的问题。尽管理论上已指出在超高温或超高密的条件下可以有夸克物质存在,但是由于地面实验室的条件所限,目前还不能通过实验证实这一点.宇宙中被观测到的中子星(例如crab和Vela脉冲星)的中心密度大于4倍的核物质密度,其中心温度也可以达到10~8—10~9K,于是人们希

Early Neutron Stars and Quark Matter

There may exist quark matter inside the early ho! neutron stars. By means of the general method used by G. Baym and S. A. Chin, we obtain the pressures and densities of neutronmatter-quark matter phase transition at different temperatures and compare these densitieswith the central densities of the stable hot neution stars at each temperature. We get the following conclusions:1) There is a core of quark matter in the early hot neutron star as long as its tempera-ture is higher than 1010K.2) The bag constant B (the density of volume energy of quark matter) is the most important factor affecting the size of quark core. At a definite temperature the quark core will become larger with B getting smaller.3) According to the conservation of total baryon number, the total energy released by a Star during the cooling process from r = 1010K is about 1053ergs.