多组分相对论热化的模拟
Simulations of multicomponent relativistic thermalization
摘要：
多组分相对论性流体已经研究了几十年。然而，模拟这样的混合物中的颗粒和流体的动力学一直是一个挑战，因为这样的模拟在三维空间中计算昂贵。在这里，我们报告的发展和应用的多维相对论蒙特卡罗代码，探索热化过程中的相对论多组分环境中的计算成本低廉的方式。作为一个例子，我们模拟完全相对论性三维布朗运动的解决方案，热化的高质量粒子（质子）在相对论性低质量粒子（电子）浴。我们遵循的热化和最终的平衡分布的布朗粒子可能发生在宇宙等离子体在大爆炸核合成。我们还模拟了注入等离子体的高能粒子的热化，例如，在大爆炸期间大量不稳定粒子的衰变。
英文摘要：
Multicomponent relativistic fluids have been studied for decades. However, simulating the dynamics of the particles and fluids in such a mixture has been a challenge due to the fact that such simulations are computationally expensive in three spatial dimensions. Here, we report on the development and application of a multi dimensional relativistic Monte Carlo code to explore of the thermalization process in a relativistic multicomponent environment in a computationally inexpensive way. As an illustration we simulate the fully relativistic three dimensional Brownian-motion-like solution to the thermalization of a high mass particle (proton) in a bath of relativistic low-mass particles (electrons). We follow the thermalization and ultimate equilibrium distribution of the Brownian-like particle as can happen in the cosmic plasma during big bang nucleosynthesis. We also simulate the thermalization of energetic particles injected into the plasma as can occur, for example, by the decay of massive unstable particles during the big bang.
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