Ruling out the supersoft high-density symmetry energy from the discovery of PSR J0740+6620 with mass $2.17^{+0.11}_{-0.10}M_odot$. (arXiv:1907.12284v1 [nucl-th])
<a href="http://arxiv.org/find/nucl-th/1/au:+Zhou_Y/0/1/0/all/0/1">Ying Zhou</a>, <a href="http://arxiv.org/find/nucl-th/1/au:+Chen_L/0/1/0/all/0/1">Lie-Wen Chen</a>
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.
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.
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