中微子的BCS-BEC交叉型谱分裂
Spectral splits of neutrinos as a BCS-BEC crossover type phenomenon
摘要：
我们表明，光谱分裂的中微子系综，最初由电子型中微子，是类似的BCS-BEC交叉已经观察到的超冷原子气体实验。这样的中微子系综模拟了核心坍缩超新星的去质子化爆发。虽然这两种现象属于非常不同的物理学领域，但中微子从超新星内部高度相互作用区域到真空的传播让人想起库珀对在交叉期间在弱相互作用和强相互作用区域之间的演变。如果用哈密顿量的中微子同位旋代替多体态的对准自旋，那么哈密顿量和相应的多体态会经历非常相似的变换。
英文摘要：
We show that the spectral split of a neutrino ensemble which initially consists of electron type neutrinos, is analogous to the BCS-BEC crossover already observed in ultra cold atomic gas experiments. Such a neutrino ensemble mimics the deleptonization burst of a core collapse supernova. Although these two phenomena belong to very different domains of physics, the propagation of neutrinos from highly interacting inner regions of the supernova to the vacuum is reminiscent of the evolution of Cooper pairs between weak and strong interaction regimes during the crossover. The Hamiltonians and the corresponding many-body states undergo very similar transformations if one replaces the pair quasispin of the latter with the neutrino isospin of the former.
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