论文标题
核面食的热波动
Thermal Fluctuations in Nuclear Pasta
论文作者
论文摘要
尽管具有天体物理相关性，但在高温下，核面食阶段相对未研究。我们提出了对称核物质的分子动力学模拟，其中几种“宽羊岩”的拓扑在一系列温度下研究了面食 - 均匀的过渡。使用Minkowski功能，我们量化了占用体积，表面积，平均广度和Euler特征的趋势。意大利面的表面位移的幅度随温度的增加而增加，这些温度会产生短暂的拓扑缺陷，例如熔化的孔和细丝，从而导致功率定律，以增加表面曲率随温度而增加。我们计算静态结构因子，并报告面食的剪切粘度和导热率，发现在熔化温度下，剪切粘度最小。这些结果可能对核面食的热弹性和有限温度校正对面食密度的状态方程有影响。
Despite their astrophysical relevance, nuclear pasta phases are relatively unstudied at high temperatures. We present molecular dynamics simulations of symmetric nuclear matter with several topologies of `lasagna' at a range of temperatures to study the pasta-uniform transition. Using the Minkowski functionals we quantify trends in the occupied volume, surface area, mean breadth, and Euler characteristic. The amplitude of surface displacements of the pasta increase with temperature which produce short lived topological defects such as holes and filaments near melting, resulting in power laws for increasing surface curvature with temperature. We calculate the static structure factor and report the shear viscosity and thermal conductivity of pasta, finding that the shear viscosity is minimized at the melting temperature. These results may have implications for the thermoelastic properties of nuclear pasta and finite temperature corrections to the equation of state at pasta densities.
