Crucial Physical Dependencies of the Core-Collapse Supernova Mechanism

Crucial Physical Dependencies of the Core-Collapse Supernova Mechanism
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核心塌缩超新星机制的关键物理依赖性

DOI:
10.1007/s11214-017-0450-9
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发表时间:
2018
影响因子:
10.3
通讯作者:
Radice, D.
Radice, D.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Burrows, A.;Vartanyan, D.;Dolence, J. C.;Skinner, M. A.;Radice, D.

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我们探索与自洽的2D Fornax模拟的结果的依赖崩溃的中微子-核子截面的多体修正,核子-核子韧致辐射率,重核上的电子捕获,崩溃前的种子扰动,和非弹性中微子-电子和中微子-核子散射。重要的是,接近临界状态会放大中微子-物质耦合中即使很小的变化的作用,这些变化加在一起也会产生巨大的影响。当接近临界条件时,一些单独只有适度后果的小效应(包括种子)的累积结果可以将贫血转化为强大的爆炸,甚至将哑弹转化为爆炸。这种敏感性在一个维度上是看不到的,这可能解释了国际上进行的详细模拟结果的明显异质性。一个自然的结论是,不同的小组集体更接近于对核心坍缩超新星机制的现实理解,而不是看起来很明显。
We explore with self-consistent 2D Fornaxsimulations the dependence of the outcome of collapse on many-body corrections to neutrino-nucleon cross sections, the nucleon-nucleon bremsstrahlung rate, electron capture on heavy nuclei, pre-collapse seed perturbations, and inelastic neutrino-electron and neutrino-nucleon scattering. Importantly, proximity to criticality amplifies the role of even small changes in the neutrino-matter couplings, and such changes can together add to produce outsized effects. When close to the critical condition the cumulative result of a few small effects (including seeds) that individually have only modest consequence can convert an anemic into a robust explosion, or even a dud into a blast. Such sensitivity is not seen in one dimension and may explain the apparent heterogeneity in the outcomes of detailed simulations performed internationally. A natural conclusion is that the different groups collectively are closer to a realistic understanding of the mechanism of core-collapse supernovae than might have seemed apparent.
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