CMB: Sound Waves in the Early Universe
CMB: Sound Waves in the Early Universe
CMB: Sound Waves in the Early Universe
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Acoustic Oscillations <strong>in</strong> <strong>the</strong> <strong>CMB</strong><br />
Temperature map of<br />
<strong>the</strong> cosmic microwave<br />
background radiation<br />
<br />
Although <strong>the</strong>re are fluctuations on all scales, <strong>the</strong>re is a characteristic angular<br />
scale, ~ 1 degree on <strong>the</strong> sky, set by <strong>the</strong> distance sound waves <strong>in</strong> <strong>the</strong> photonbaryon<br />
fluid can travel just before recomb<strong>in</strong>ation: sound horizon ~ c s t ls
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