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  1. Why Be Natural?Jonathan Bain - 2019 - Foundations of Physics 49 (9):898-914.
    Naturalness, as a guiding principle for effective field theories, requires that there be no sensitive correlations between phenomena at low- and high-energy scales. This essay considers four reasons to adopt this principle: natural EFTs exhibit modest empirical success; unnatural EFTs are improbable; naturalness underwrites what Williams calls a “central dogma” of EFTs; namely, that phenomena at widely separated scales should decouple; and naturalness underwrites a non-trivial notion of emergence. I argue that the first three are not compelling reasons, whereas the (...)
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  • The Practice of Naturalness: A Historical-Philosophical Perspective.Arianna Borrelli & Elena Castellani - 2019 - Foundations of Physics 49 (9):860-878.
    No evidence of “new physics” was found so far by LHC experiments, and this situation has led some voices in the physics community to call for the abandonment of the “naturalness” criterion, while other scientists have felt the need to break a lance in its defense by claiming that, at least in some sense, it has already led to successes and therefore should not be dismissed too quickly, but rather only reflected or reshaped to fit new needs. In our paper (...)
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  • Two Notions of Naturalness.Porter Williams - 2019 - Foundations of Physics 49 (9):1022-1050.
    My aim in this paper is twofold: to distinguish two notions of naturalness employed in beyond the standard model physics and to argue that recognizing this distinction has methodological consequences. 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. I will argue that considerations from the general structure of effective field theory provide justification for the role this notion (...)
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  • Naturalness and Emergence.David Wallace - 2019 - The Monist 102 (4):499-524.
    I develop an account of naturalness in physics which demonstrates that naturalness assumptions are not restricted to narrow cases in high-energy physics but are a ubiquitous part of how interlevel relations are derived in physics. After exploring how and to what extent we might justify such assumptions on methodological grounds or through appeal to speculative future physics, I consider the apparent failure of naturalness in cosmology and in the Standard Model. I argue that any such naturalness failure threatens to undermine (...)
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