Astrophysics I
Acoustic peaks refer to the distinct oscillation patterns seen in the power spectrum of cosmic microwave background (CMB) radiation, which provide critical information about the early universe. These peaks arise from sound waves propagating through the hot plasma of the early universe before the formation of the cosmic microwave background, leading to variations in temperature and density that we can observe today. The positions and amplitudes of these peaks help cosmologists understand fundamental properties of the universe, including its geometry, composition, and expansion history.
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