Naturalness is an old idea; it dates back at least to the 16th century and captures the intuition a useful description shouldn’t rely on improbable coincidences. Typical good examples for such coincidences, also known as “conspiracies,” are two independent parameters that almost cancel one another seemingly, or a small yet nonzero number extremely. Physicists believe that theories which do not have such coincidences, and are natural in this specific sense, are more promising than theories that are unnatural. Naturalness has its roots in human being experience.
If you go for a walk and encounter a delicately well-balanced stack of rocks, you conclude someone constructed it. This summary is dependent on your knowledge that rocks distributed throughout landscapes by erosion, weathering, deposition, and other geological procedures aren’t likely to end up on neat hemorrhoids. You know this reliably, because you have observed a great deal of rocks quite, meaning you have figures from which you can extract a likelihood. As the example ideally illustrates, naturalness is an excellent criterion in certain circumstances, when you yourself have statistics namely or at least means to derive statistics.
A solar system with ten planets in almost the same orbit is unlikely. A solar system with ten planets in almost the same plane isn’t. We know this both because we’ve noticed a complete lot of solar systems, and also because we can derive their likely distribution using the laws of nature discovered so far, and initial conditions that people can draw out from yet other … Read the rest