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arXiv 2207.04058astro-ph.HEhep-ph
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中微子味转换、平流与碰撞:迈向完整解

Neutrino Flavor Conversion, Advection, and Collisions: Towards the Full Solution

Shashank Shalgar, Irene Tamborra

AI总结:

在球对称假设下,首次模拟了中微子-中微子前向散射、碰撞与平流共存时的味转换,发现味均分非普遍结果,快慢转换可同时发生,且电子中微子轻子数交叉诊断法具局限性。

摘要:

在致密天体源的高密度条件下,中微子间的相干前向散射导致味演化呈非线性。在球对称假设下,我们首次模拟了在存在中微子-中微子前向散射、与物质背景的中性和带电流碰撞,以及中微子平流时的味转换。我们发现,尽管味均分可能是一种解,但它并非文献中常假设的普遍结果。有趣的是,味转换、碰撞与平流间的强烈相互作用,导致味转换在中微子角分布和相邻空间区域中扩散。模拟表明慢速与快速味转换可同时发生。鉴于此,将电子中微子轻子数的交叉作为高密度区域味转换发生的诊断工具是一种有局限的方法。

英文摘要:

At high densities in compact astrophysical sources, the coherent forward scattering of neutrinos onto each other is responsible for making the flavor evolution non-linear. Under the assumption of spherical symmetry, we present the first simulations tracking flavor transformation in the presence of neutrino-neutrino forward scattering, neutral and charged current collisions with the matter background, as well as neutrino advection. We find that, although flavor equipartition could be one of the solutions, it is not a generic outcome, as often postulated in the literature. Intriguingly, the strong interplay between flavor conversion, collisions, and advection leads to a spread of flavor conversion across the neutrino angular distributions and neighboring spatial regions. Our simulations show that slow and fast flavor transformation can occur simultaneously. In the light of this, looking for crossings in the electron neutrino lepton number as a diagnostic tool of the occurrence of flavor transformation in the high-density regime is a limiting method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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