Equation 9 · Fine-Tuning Without a Tuner: Selection Effects in Physics
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A measured, rather than merely modeled, dynamical mechanism for the cosmological constant’s smallness — something playing the role for that Peccei-Quinn plays for theta — would do the equivalent for the discipline’s hardest fine-tuning problem, and its absence after decades of serious theoretical effort is itself informative, not neutral; it is part of why the anthropic route retains as many adherents as it does among physicists who would otherwise prefer a dynamical answer.
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