Undergrad What is the reason for density perturbations in the CMB?

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Density perturbations in the Cosmic Microwave Background (CMB) may originate from various sources, including primordial black holes. The discussion highlights the complexity of understanding these perturbations and suggests that existing literature may not provide clear answers. Insights articles, particularly parts 3, 4, and 5, delve into the mechanisms behind these density fluctuations. The quest for a comprehensive explanation continues, as researchers explore multiple theories. Further investigation into the CMB's origins is essential for a deeper understanding of the universe's formation.
timmdeeg
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I could not find an answer by checking the web. Could these perturbations originate from primordial black holes? What else?
 
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