{"id":"hyp-au-mlip-escape","title":"Au Escapes the Ribbon Under MLIPs","subtitle":"Confirmed for MACE + CHGNet; Ag escape refuted. Mechanism open.","category":"conjectures","tags":["au","mlip","escape"],"source":"articles/docs/conjectures/au-mlip-escape.md","lang":"en","words":188,"readMinutes":1,"toc":[{"depth":2,"text":"Claim","id":"claim"},{"depth":2,"text":"Evidence so far","id":"evidence-so-far"},{"depth":2,"text":"Why it stays open","id":"why-it-stays-open"},{"depth":2,"text":"Next","id":"next"}],"html":"<h1 id=\"au-escapes-the-ribbon-under-foundation-mlips\">Au Escapes the Ribbon Under Foundation MLIPs</h1><p><strong>Status: Open</strong></p>\n<h2 id=\"claim\">Claim</h2><p>Gold (Au) is a special case: when foundation MLIPs are added, Au&#39;s error vector\n<em>escapes</em> the hyper-ribbon (its participation ratio jumps), unlike the other 14 IMMI\nelements which stay compressed.</p>\n<h2 id=\"evidence-so-far\">Evidence so far</h2><ul>\n<li><strong>MACE-MP-0:</strong> Au escapes (PR 1.02 → 1.67); Pt compresses (1.29 → 1.03).</li>\n<li><strong>CHGNet:</strong> Au escape <strong>confirmed</strong> independently.</li>\n<li><strong>Ag</strong> was hypothesized to escape similarly — <strong>refuted</strong>: CHGNet pulls Ag back onto\nthe ribbon. So the escape is Au-specific, not a noble-metal class effect.</li>\n<li>Reconciliation note: PR-based escape detection and within-style rank-correlation\nauto-eval are <em>orthogonal</em> lenses; both stand. Pearson r at n = 3 with wide property\nspread is ill-posed for escape detection — do not use it as the arbiter.</li>\n</ul>\n<h2 id=\"why-it-stays-open\">Why it stays open</h2><p>The effect is real and reproduced across two MLIPs, but the <em>mechanism</em> is unknown and\nthe noble-vs-refractory split (group means 0.90 vs 0.22) is a competing framing not yet\nresolved. Confidence sits ~0.65 after the auto-eval reconciliation.</p>\n<h2 id=\"next\">Next</h2><p>Add Orb-v3 / further MLIPs to test Au-specificity vs. a broader pattern; pin down a\nmechanistic hypothesis (relativistic d-electron behavior is the leading candidate) and\nstate it falsifiably.</p>\n"}