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为什么宇宙微波背景有温度起伏？
宇宙微波背景有温度起伏主要是因为早期宇宙密度不均匀、重子声波振荡以及后期演化中的物质分布变化。
1、早期宇宙密度不均匀。在大爆炸初期，宇宙中的物质分布并非完全均匀，这种密度差异导致光子与物质相互作用时产生了温度的微小变化。
2、重子声波振荡。宇宙早期，重子-光子流体中的声波振荡在再复合时期留下了印记，形成了温度的波动，这些波动反映了早期宇宙物质分布的密度变化。
3、后期演化中的物质分布变化。随着宇宙的演化，星系和星系团的形成进一步影响了微波背景的温度分布，例如通过苏尼亚耶夫-泽尔多维奇效应，星系团中的热气体使背景辐射温度发生微小变化。
总结：宇宙微波背景有温度起伏，是因为早期宇宙密度不均匀、重子声波振荡以及后期演化中的物质分布变化。
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