Naturalness: a useful principle, but not an absolute rule

Big Think ·
Health

There are two classes of problems that physicists often talk about that might leave you thinking, “geez, a physicist can never be satisfied, can they?” The first is called a coincidence problem: where things that have no apparent reason for being close together actually are close together. Examples include: the normal matter and dark matter densities, the cosmic matter density and the dark energy…

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