http://arxiv.org/abs/1907.12284
Using the very recently reported mass $2.17^{+0.11}{-0.10}M\odot$ 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 $E_{\rm sym}(n)$ 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 mass $2.01 \pm 0.04 M_\odot$ of PSR J0348+0432 cannot rule out the supersoft high-density $E_{\rm sym}(n)$. Furthermore, we find the stiffer high-density $E_{\rm sym}(n)$ based on the existence of $2.17M_\odot$ NSs leads to a strong constraint of $\Lambda_{1.4} \ge 362^{+89}{-58}$ for the dimensionless tidal deformability of the canonical $1.4M\odot$ NS.
Y. Zhou and L. Chen
Tue, 30 Jul 19
58/79
Comments: 6 pages, 2 figures, 1 table
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