论文标题
中子星星合并中改变陌生的率和超声的散装粘度
Strangeness-changing Rates and Hyperonic Bulk Viscosity in Neutron Star Mergers
论文作者
论文摘要
在本文中，我们介绍了改变陌生的过程的速率，以及在中子恒星合并典型的密度和温度下，最终的物质的散装粘度。为了处理这种环境中的高温，我们超越了费米表面的近似值，并在数值上评估了整个相空间的积分。我们包括在Baryons通过Meson Exchange之间移动的过程：在先前的分析中通常省略了这些过程，但对改变陌生的过程和大量粘度的速度提供了主要的贡献。这些速率的计算是迈向合并中超音速物质中耗散机制的任何计算的重要步骤。作为一种应用，我们在合并模拟中看到的频率下计算密度振荡的耗散时间。我们发现，在这种情况下，可能会忽略MEV制度中温度的超子散装粘度，但与KEV-范围的温度高度相关。
In this paper we present a computation of the rates of strangeness-changing processes and the resultant bulk viscosity in matter at the densities and temperatures typical of neutron star mergers. To deal with the high temperature in this environment we go beyond the Fermi surface approximation in our rate calculations and numerically evaluate the full phase space integral. We include processes where quarks move between baryons via meson exchange: these have generally been omitted in previous analyses but provide the dominant contribution to the rates of strangeness-changing processes and the bulk viscosity. The calculation of these rates is an essential step towards any calculation of dissipation mechanisms in hyperonic matter in mergers. As one application, we calculate the dissipation times for density oscillations at the frequencies seen in merger simulations. We find that hyperon bulk viscosity for temperatures in the MeV regime can probably be neglected in this context, but becomes highly relevant for keV-range temperatures.
