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Do we need fine-tuning to create primordial black holes? · Around

2018

Do we need fine-tuning to create primordial black holes?

Nakama, Tomohiro, Wang, Yi

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Recently, the formation of primordial black holes (PBHs) from the collapse of primordial fluctuations has received much attention.

The abundance of PBHs formed during radiation domination is sensitive to the tail of the probability distribution of primordial fluctuations.
We quantify the level of fine-tuning due to this sensitivity.
For example, if the main source of dark matter is PBHs with mass $10^{-12}M_\odot$, then anthropic reasoning suggests that the dark matter to baryon ratio should range between 1 and 300.

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