Claude Fable 5.2 finds the exact 15-year-open limit of modular bootstrapping
claudeai · x · 2026-11-10
Second physics result from Anthropic: Fable 5.2 found the exact limit of the simplest version of "modular bootstrapping," a 15-year-old technique used to rule out candidate quantum gravity theories. The accompanying chart shows the bound was previously only bracketed (8.503 ≤ Λ ≤ 12, best proved 8.503, numerical extrapolation 9.08); this work gives the exact optimum Λ = 12π²/(π² + 4 arcsinh²1) ≈ 9.1266, beyond reach of the spinless bootstrap within the considered functional class.
Related event: Anthropic says Claude Fable 5.2 solved two open black hole physics problems(8 posts)→
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