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Improved neutrino-nucleon interactions in dense and hot matter for numerical simulations

机译:改善中微子核聚核分相互作用,用于数值模拟

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摘要

Neutrinos play an important role in compact star astrophysics: neutrino heating is one of the main ingredients in core-collapse supernovae, neutrino-matter interactions determine the composition of matter in binary neutron star mergers and have among others a strong impact on conditions for heavy element nucleosynthesis, and neutron star cooling is dominated by neutrino emission except for very old stars. Many works in the last decades have shown that in dense matter medium effects considerably change the neutrino-matter interaction rates, whereas many astrophysical simulations use analytic approximations which are often far from reproducing more complete calculations. In this work we present a scheme which allows to incorporate improved rates for charged current interactions into simulations and show as an example some results for core-collapse supernovae, where a noticeable difference is found in the location of the neutrinospheres of the low-energy neutrinos in the early post-bounce phase.
机译:中微子在致密恒星天体物理学中起着重要作用:中微子加热是核心坍缩超新星的主要成分之一,中微子-物质相互作用决定了二元中子星合并中物质的组成,并对重元素核合成的条件产生了强烈影响,除了非常古老的恒星外,中子星的冷却主要是由中微子发射控制的。过去几十年的许多工作表明,在重物质介质中,效应会显著改变中微子与物质的相互作用速率,而许多天体物理模拟使用的是解析近似,这往往远远不能再现更完整的计算。在这项工作中,我们提出了一个方案,该方案允许将带电电流相互作用的改进速率纳入模拟中,并以核坍缩超新星为例展示了一些结果,其中低能中微子的中微子球在反弹后早期阶段的位置存在显著差异。

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