Naturalness: a useful principle, but not an absolute rule
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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 density,
the total energy of the Hoyle state of carbon-12 being almost exactly equal to the rest ma
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 density,
the total energy of the Hoyle state of carbon-12 being almost exactly equal to the rest ma
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