退耦(英语:decoupling),在宇宙学中,指各种粒子彼此脱离热平衡的时期。由于宇宙的膨胀,粒子间的平均自由程增加,相互作用频率降低,因此脱离热平衡而发生退耦。目前普遍认为大爆炸后有两种主要的退耦,分别是光子退耦中微子退耦,且它们分别导致了宇宙微波背景辐射宇宙中微子背景辐射

光子退耦

微中子退耦

大质量弱相互作用粒子:非相对论脱耦

参见

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