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arXiv 2002.00015astro-ph.CO
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用不同的初始条件对重子和暗物质进行更精确的模拟

More accurate simulations with separate initial conditions for baryons and dark matter

Simeon Bird, Yu Feng, Christian Pedersen, Andreu Font-Ribera

摘要:

我们重新审视重子和冷暗物质的宇宙学模拟技术时,每种流体有不同的初始条件,是在辐射时代结束的情况下。大多数模拟都不能再现冷暗物质和重子微扰之间差异的线性预测。我们发现,这是由于在设置粒子初始条件时通常使用偏移规则网格。通过对重子粒子使用拉格朗日玻璃,可以在不损失模拟分辨率的情况下获得正确的行为。我们进一步表明,冷暗物质和重子之间的差异可能会影响预测的莱曼α森林通量功率谱在5%的水平,可能会影响目前的宇宙学约束。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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