Definitions for naturalness
This page provides all possible meanings and translations of the word naturalness
the quality of being natural or based on natural principles
"he accepted the naturalness of death"; "the spontaneous naturalness of his manner"
artlessness, innocence, ingenuousness, naturalness(noun)
the quality of innocent naivete
the likeness of a representation to the thing represented
"engineers strove to increase the naturalness of recorded music"
The state or quality of being natural.
Of a picture or recording, likeness to the original.
the state or quality of being natural; conformity to nature
Naturalness is the property that the free parameters or physical constants appearing in a physical theory should take relative values of order 1. That is, a natural theory would have parameters with values like 2.34 rather than 234000. This is in contrast to current theory like the standard model, where there are a number of parameters that vary by many orders of magnitude, and require extensive "fine-tuning" of those values in order for the theory to predict a universe like the one we live in. The requirement that satisfactory theories should be "natural" in this sense is a current of thought initiated around the 1960s in particle physics. It is an aesthetic criterion, not a physical one, that arises from the seeming non-naturalness of the standard model and the broader topics of the hierarchy problem, fine-tuning, and the anthropic principle. It is not always compatible with Occam's razor, since many instances of "natural" theories have more parameters than "fine-tuned" theories such as the Standard Model.
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