Fast pairwise conversions of neutrinos may affect the flavor distribution in the core of neutrino-dense sources. We explore the interplay between collisions and fast conversions within a simplified framework that assumes angle-independent, direction-changing collisions in a neutrino gas that has no spatial inhomogeneity. Counter to expectations, we find that collisions may enhance fast flavor conversions instead of damping them. Our work highlights the need to take into account the feedback of collisions on the neutrino angular distributions self-consistently, in order to predict the flavor outcome in the context of fast pairwise conversions reliably.

中文翻译：

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成对中微子转换物理学中方向的变化：碰撞的影响

中微子的快速成对转换可能会影响中微子密集源核心中的风味分布。我们在一个简化的框架内探索碰撞与快速转换之间的相互作用，该框架假设在没有空间不均匀性的中微子气体中，角度无关，方向改变的碰撞。与预期相反，我们发现碰撞可能会促进快速的风味转换，而不是抑制它们。我们的工作强调需要自洽地考虑中微子角度分布上的碰撞反馈，以便在快速成对转换的情况下可靠地预测风味结果。