Nuclear pasta in hot and dense matter and its influence on the equation of state for astrophysical simulations
Nuclear pasta in hot and dense matter and its influence on the equation of state for astrophysical simulations
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热致密物质中的核意大利面及其对天体物理模拟状态方程的影响
DOI：
10.1103/physrevc.102.015806
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发表时间：
2020-07
影响因子：
3.1
通讯作者：
Hong Shen
中科院分区：
文献类型：
--
作者：
Fan Ji;Jinniu Hu;Shishao Bao;Hong Shen
我们探讨了超新星物质中出现的核面食的性质，即，物质在有限的温度与。一个固定的质子分数。本文用可压缩液滴（CLD）模型研究了具有一系列几何形状的pasta相，其中核物质分离为核子的稠密液相和核子与α粒子的稀气相。通过最小化总自由能（包括表面和库仑贡献）导出了两个共存相的平衡条件，由于有限尺寸效应，这与Gibbs相平衡条件明显不同。与只考虑球形核的结果相比，pasta相的加入使向均匀物质的转变延迟，并扩大了相图中的非均匀物质区域。用CLD模型计算得到的热力学量与实际天体物理模拟用的状态方程表中的热力学量一致。结果表明，不同形状的面密度范围既取决于温度T，又取决于质子分数Yp。此外，核对称能及其密度依赖性可能在决定pasta相的性质方面起着至关重要的作用。我们的结果表明，pasta相图对对称能斜率L的依赖性最敏感，特别是在低Yp和高T区。
We explore the properties of nuclear pasta appearing in supernova matter, i.e., matter at finite temperature with.a fixed proton fraction. The pasta phases with a series of geometric shapes are studied using the compressible.liquid-drop (CLD) model, where nuclear matter separates into a dense liquid phase of nucleons and a dilute.gas phase of nucleons and α particles. The equilibrium conditions for two coexisting phases are derived by.minimization of the total free energy including the surface and Coulomb contributions, which are clearly different.from the Gibbs conditions for phase equilibrium due to the finite-size effects. Compared to the results considering.only spherical nuclei, the inclusion of pasta phases can delay the transition to uniform matter and enlarge.the region of nonuniform matter in the phase diagram. The thermodynamic quantities obtained in the present.calculation with the CLD model are consistent with those in the realistic equation of state table for astrophysical.simulations using the Thomas-Fermi approximation. It is found that the density ranges of various pasta shapes.depend on both the temperature T and the proton fraction Yp. Furthermore, the nuclear symmetry energy and its.density dependence may play crucial roles in determining the properties of pasta phases. Our results suggest that.the pasta phase diagram is most sensitively dependent on the symmetry energy slope L especially in the low-Yp.and high-T region.
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对称能量对中子星壳中核“面食”的影响
影响因子：
3.1
作者：
Bao S. S.;Shen H.
通讯作者：
Shen H.
影响因子：
3.1
作者：
C. Pethick;Zhaowen Zhang-;D. Kobyakov
通讯作者：
C. Pethick;Zhaowen Zhang-;D. Kobyakov
对称能对中子滴密度附近中子星壳性质的影响
影响因子：
3.1
作者：
Bao S. S.;Hu J. N.;Zhang Z. W.;Shen H.
通讯作者：
Shen H.
DOI：
10.1016/s0375-9474(98)00236-x
发表时间：
1998-05
期刊：
Nuclear Physics
影响因子：
--
作者：
Hong Shen;H. Toki;K. Oyamatsu;K. Sumiyoshi
通讯作者：
Hong Shen;H. Toki;K. Oyamatsu;K. Sumiyoshi
DOI：
10.3847/0004-637x/832/2/167
发表时间：
2016-03
期刊：
The Astrophysical Journal
影响因子：
--
作者：
E. Fonseca;T. Pennucci;J. Ellis;I. Stairs;D. Nice;S. Ransom;P. Demorest;Z. Arzoumanian;K. Crowter-K
通讯作者：
E. Fonseca;T. Pennucci;J. Ellis;I. Stairs;D. Nice;S. Ransom;P. Demorest;Z. Arzoumanian;K. Crowter-K