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arXiv 1801.04620nucl-thastro-ph.HEnucl-ex
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核对称能对中子星潮汐形变的影响

Imprints of the nuclear symmetry energy on the tidal deformability of neutron stars

Plamen G. Krastev, Bao-An Li

摘要:

应用状态方程(EOS)及其对称核物质(SNM)贡献和重离子反应数据约束的低密度对称能$E_{sym}(ρ)$,计算了并合双星系统中中子星的无量纲潮汐形变能$Λ$.对应于部分约束状态方程,以前预测的半径为11.5公里$\leq R_{1.4} \leq$ 13.6公里的典型中子星配置,$Λ$被发现是在292 $\leqΛ_{1.4}\leq$ 680的范围内,与最近观察到的GW170817事件。我们研究了$E_{sym}(ρ)$的高密度行为对中子星潮汐性质的影响,发现虽然$Λ$强烈地依赖于对称能的细节,但$E_{sym}(ρ)$的不同趋势导致$Λ$非常相似的值。特别地,从硬/软到软/硬$E_{sym}(ρ)$的转变可以产生相同的$Λ$。因此,单独测量$Λ$不能完全确定对称能的密度依赖性。因此,有必要对核实验室实验和天体物理观测所依据的致密富中子核物质状态方程进行相干分析,以打破这种简并精确确定$E_{sym}(ρ)$的细节。

英文摘要:

Applying an equation of state (EOS) with its symmetric nuclear matter (SNM) contribution and low-density symmetry energy $E_{sym}(ρ)$ constrained by heavy-ion reaction data, we calculate the dimensionless tidal deformability $Λ$ of neutron stars in coalescing binary systems. Corresponding to the partially constrained EOS that previously predicted a radius of 11.5 km $\leq R_{1.4} \leq$ 13.6 km for canonical neutron-star configurations, $Λ$ is found to be in the range of 292 $\leqΛ_{1.4}\leq$ 680, consistent with the very recent observation of the GW170817 event. We investigate the effect of the high-density behavior of $E_{sym}(ρ)$ on the tidal properties of neutron stars and find that while $Λ$ depends strongly on the details of the symmetry energy, different trends of $E_{sym}(ρ)$ lead to very similar values of $Λ$. In particular, the transition from stiff/soft to soft/stiff $E_{sym}(ρ)$ could yield the same $Λ$. Thus, measuring $Λ$ alone may not determine completely the density dependence of the symmetry energy. Coherent analyses of the dense neutron-rich nuclear matter EOS underlying both nuclear laboratory experiments and astrophysical observations are therefore necessary to break this degeneracy and determine precisely the details of the $E_{sym}(ρ)$.

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