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<p>Prompted by misconceptions in the recent literature, we review the justifications for naturalness arguments and Occam’s razor found in Bayesian statistics. We discuss the automatic Occam’s razor that emerges in Bayesian formalism, bringing together points of view from diverse fields, including statistics, social sciences, physics and machine learning. In pedagogical calculations, we demonstrate that this automatic razor disfavors unnatural models in which predictions must be fine-tuned to agree with observation.</p>

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It’s all in your head—naturalness arguments do not require aleatoric uncertainty

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • Andrew Fowlie

摘要

Prompted by misconceptions in the recent literature, we review the justifications for naturalness arguments and Occam’s razor found in Bayesian statistics. We discuss the automatic Occam’s razor that emerges in Bayesian formalism, bringing together points of view from diverse fields, including statistics, social sciences, physics and machine learning. In pedagogical calculations, we demonstrate that this automatic razor disfavors unnatural models in which predictions must be fine-tuned to agree with observation.