We model a compact black hole-accretion disk system in the collapsar scenario with full transport, frequency dependent, general relativistic radiation magnetohydrodynamics. We examine whether or not winds from a collapsar disk can undergo rapid neutron capture (r-process) nucleosynthesis and significantly contribute to solar r-process abundances. We find the inclusion of accurate transport has significant effects on outflows, raising the electron fraction above $Y_{\rm e} \sim 0.3$ and preventing third peak r-process material from being synthesized. We analyze the time-evolution of neutrino processes and electron fraction in the disk and present a simple one-dimensional model for the vertical structure that emerges. We compare our simulation to semi-analytic expectations and argue that accurate neutrino transport and realistic initial and boundary conditions are required to capture the dynamics and nucleosynthetic outcome of a collapsar.

中文翻译：

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坍缩星核合成的全输运广义相对论辐射磁流体动力学

我们在塌陷场景中模拟了一个紧凑的黑洞吸积盘系统，具有完全传输、频率相关、一般相对论辐射磁流体动力学。我们研究了来自塌陷盘的风是否可以进行快速中子捕获（r 过程）核合成并显着促进太阳 r 过程丰度。我们发现包含精确传输对流出具有显着影响，将电子分数提高到 $Y_{\rm e} \sim 0.3 $ 以上，并防止合成第三个峰值 r-process 材料。我们分析了盘中中微子过程和电子分数的时间演化，并为出现的垂直结构提供了一个简单的一维模型。