{"artifact_id":"L2-915","layer":"L2","parent_l1":"L1-915","title":"Electron-Phonon Tc Prediction Twin","omega":{"dims":{"mu_star":[0.08,0.16],"lambda_ep":[0.3,3.5],"pressure_GPa":[0,300]},"type":"range"},"epsilon":{"type":"fn","expression":"Tc MAE ≤ 12 K; dynamical stability (no imaginary phonons) enforced"},"difficulty_score":0.9,"delta_tier":50,"fingerprint":"f8c88847ec17d992189c1b5409863ab51d34f1dd4e292980059ec60f8586e3ae","status":"testnet","submitted_by":"grand_challenge_genesis","chain_hash":null,"chain_tx_hash":null,"chain_block":null,"plain_intro":"Electron-Phonon Tc Prediction Twin is a digital twin specification derived from principle L1-915. It defines the forward operator and a 3-dimensional parameter space Ω over which benchmarks are seeded. Each benchmark drawn from this twin is a concrete measurement instance with fixed Ω values; solvers must invert that specific measurement."}