论文标题
更准确的模拟，带有针对重子和暗物质的单独初始条件
More accurate simulations with separate initial conditions for baryons and dark matter
论文作者
论文摘要
当每种液体具有不同的初始条件时，我们重新审视用于使用重子和冷暗物质进行宇宙学模拟的技术，就像辐射时代结束时一样。大多数仿真不会重现冷暗物质和重子扰动之间差异的线性预测。我们表明，这是由于设置粒子初始条件时常见的偏移常规网格的常规使用。可以通过使用Lagrangian玻璃作为BARYON颗粒来获得正确的行为，而不会损失任何模拟分辨率。我们进一步表明，冷暗物质和重子之间的差异可能会影响5％水平的Lyman-Alpha森林通量功率谱的预测，从而可能影响当前的宇宙学限制。
We revisit techniques for performing cosmological simulations with both baryons and cold dark matter when each fluid has different initial conditions, as is the case at the end of the radiation era. Most simulations do not reproduce the linear prediction for the difference between the cold dark matter and baryon perturbations. We show that this is due to the common use of offset regular grids when setting up the particle initial conditions. The correct behaviour can be obtained without any loss of simulation resolution by using a Lagrangian glass for the baryon particles. We further show that the difference between cold dark matter and baryons may affect predictions for the Lyman-alpha forest flux power spectrum at the 5% level, potentially impacting current cosmological constraints.
