Ruling Out the Supersoft High-density Symmetry Energy from the Discovery of PSR J0740+6620 with Mass
Ruling Out the Supersoft High-density Symmetry Energy from the Discovery of PSR J0740+6620 with Mass
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DOI：
10.3847/1538-4357/ab4adf
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发表时间：
2019-07
期刊：
影响因子：
--
通讯作者：
Ying Zhou;Lie-Wen Chen
中科院分区：
文献类型：
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作者：
Ying Zhou;Lie-Wen Chen
Using the very recently reported mass of PSR J0740+6620 together with the data of finite nuclei and the constraints on the equation of state of symmetric nuclear matter at suprasaturation densities from flow data in heavy-ion collisions, we show that the symmetry energy Esym(n) cannot be supersoft so that it becomes negative at suprasaturation densities in neutron stars (NSs) and thus may make the NS have a pure neutron matter core. This is in contrast to the fact that using the mass 2.01 ± 0.04M⊙ of PSR J0348+0432 as the NS maximum mass cannot rule out the supersoft high-density Esym(n). Furthermore, we find the stiffer high-density Esym(n) based on the existence of 2.14M⊙ NSs leads to a strong constraint of for the dimensionless tidal deformability of the canonical 1.4M⊙ NS.
