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arXiv 1104.4031hep-phastro-ph.SR
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在超新星吸积阶段没有集体中微子味转换

No collective neutrino flavor conversions during the supernova accretion phase

Sovan Chakraborty, Tobias Fischer, Alessandro Mirizzi, Ninetta Saviano, Ricard Tomas

摘要:

在反弹后的吸积阶段,从核心坍缩超新星(SNe)发出的大中微子通量具有不同的味道层次,提供了最好的机会来检测中微子味道振荡的影响。我们执行一个专门的研究SN中微子的味道在吸积阶段的演变,使用最近的中微子辐射流体动力学模拟的结果。与仅存在中微子-中微子相互作用时的预期相反,我们发现与致密普通物质相关的多角度效应抑制了集体振荡。这与大质量铁核祖先的核塌缩SNe的吸积阶段的高物质密度有关。物质抑制意味着中微子振荡将在中微子输运区之外开始,因此对中微子加热和爆炸动力学的影响可以忽略不计。此外,在混合角$θ_{13}$不是很小的情况下,基于通常的SN地幔中的Mikheyev-Smirnov-Wolfenstein效应和地球物质效应,可能探测到来自吸积阶段的下一个银河SN中微子信号,可以揭示中微子质量等级。

英文摘要:

The large neutrino fluxes emitted with a distinct flavor hierarchy from core-collapse supernovae (SNe) during the post-bounce accretion phase, offer the best opportunity to detect effects from neutrino flavor oscillations. We perform a dedicated study of the SN neutrino flavor evolution during the accretion phase, using results from recent neutrino radiation hydrodynamics simulations. In contrast to what expected in the presence of only neutrino-neutrino interactions, we find that the multi-angle effects associated with the dense ordinary matter suppress collective oscillations. This is related to the high matter densities during the accretion phase in core-collapse SNe of massive iron-core progenitors. The matter suppression implies that neutrino oscillations will start outside the neutrino transport region and therefore will have a negligible impact on the neutrino heating and the explosion dynamics. Furthermore, the possible detection of the next galactic SN neutrino signal from the accretion phase, based on the usual Mikheyev- Smirnov-Wolfenstein effect in the SN mantle and Earth matter effects, can reveal the neutrino mass hierarchy in the case that the mixing angle $θ_{13}$ is not very small.

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