A second, distinct notion construes naturalness as a statistical principle requiring that the values of the parameters in an effective field theory be ``likely'' given some appropriately chosen measure on some appropriately circumscribed space of models. I will argue that considerations from the general structure of effective field theory provide justification for the role this notion of naturalness has played in BSM model construction. One notion of naturalness is an ``autonomy of scales'' requirement: it prohibits sensitive dependence of an effective field theory's low-energy observables on precise specification of the theory's description of cutoff-scale physics. My aim in this paper is twofold: (i) to distinguish two notions of naturalness employed in Beyond the Standard Model (BSM) physics and (ii) to argue that recognizing this distinction has methodological consequences.
0 Comments
Leave a Reply. |