核心坍缩超新星玻尔兹曼中微子辐射流体动力学模拟中的动量空间分辨率依赖性
Momentum Space Resolution Dependence in Boltzmann Neutrino Radiation Hydrodynamics Simulations of Core-collapse Supernovae
查看机构详情
- Faculty of Science and Engineering, Waseda University（早稻田大学理工学部）
机构由 AI 辅助整理，请以论文原文为准。
浏览论文内容
中文总结 AI 辅助
研究核心坍缩超新星玻尔兹曼中微子辐射流体动力学模拟中动量空间分辨率依赖性，通过二维CCSN模拟及改变天顶角、方位角和能量分辨率探讨对爆炸动力学影响，还研究一维黑洞形成模型，揭示不同分辨率影响规律。
中文摘要 AI 辅助
有限的动量空间分辨率是用离散坐标法求解玻尔兹曼方程时不确定性的主要来源。本文通过一系列二维核心坍缩超新星（CCSN）模拟研究了玻尔兹曼中微子输运的动量空间分辨率依赖性。通过分别改变动量空间中方位角和能量的分辨率来讨论对爆炸动力学的影响。发现天顶角分辨率粗糙会人为促进爆炸，能量分辨率粗糙则会抑制爆炸。还研究了一维黑洞形成模型的分辨率依赖性，其不像爆炸动力学那样有强烈角度依赖性，低能量分辨率会延迟黑洞形成时间。
英文摘要
Finite momentum space resolution is a primary source of uncertainty in solving the Boltzmann equation with the discrete-ordinates method. In this paper, the momentum space resolution dependence of Boltzmann neutrino transport is studied by performing a series of two-dimensional core-collapse supernova (CCSN) simulations. The effects on the explosion dynamics are discussed by individually varying the resolutions of the zenith and azimuth angles in momentum space, and of the energy. It is found that a coarse zenith angle resolution artificially facilitates the explosion, even turning non-exploding models into exploding ones. This is because the coarse zenith angle grid cannot capture the forward-peaked distribution, thereby underestimating the flux factor and making neutrinos stay in the gain region for a longer time. The dependence on the azimuth angle resolution is found to have little effect for the present non-rotating models, which is understandable given the sphericity of the CCSN core. In contrast to the zenith angle resolution, a coarse energy resolution is found to artificially suppress the explosion. This is because the neutrino heating rate at intermediate energies ($\sim30$--$50\,\mathrm{MeV}$) is underestimated in the low-resolution case. Finally, the resolution dependence is studied for a one-dimensional black hole (BH) forming model. Unlike the explosion dynamics, BH formation does not exhibit a strong angular dependence. On the other hand, a coarse energy resolution is found to delay the BH formation time. This is because the momentum feedback is overestimated at low resolution, which allows a more massive neutron star to be supported.
