{"artifact_id":"L1-371","layer":"L1","title":"Stellar Atmosphere Spectral Inversion","domain":"Astrophysics","sub_domain":"Stellar spectroscopy","physics_fingerprint":{"L_DAG":3.5,"title":"Stellar Atmosphere Spectral Inversion","domain":"Astrophysics","carrier":"photon","primitives":["S.radiative.transfer_lte","G.structured","O.chi2.spectral_lines"],"sub_domain":"Stellar spectroscopy","noise_model":"shot_poisson","problem_class":"nonlinear_inverse","solution_space":"1D_atmospheric_profile","difficulty_delta":5,"integration_axis":"optical_depth","sensing_mechanism":"radiative_transfer_spectral"},"observable_profile":{"metric":"spectral_chi2_reduced","regime":"Existence of the recovered 1D_atmospheric_profile is guaranteed within the declared Omega bounds. Uniqueness holds on the measurement-supported subspace; out-of-support modes are controlled by declared priors. Stability is conditionally stable (kappa_eff ~= 500); continuum_normalization_error dominates the stability cliff; the remaining mismatch parameters contribute higher-order bias terms. Shot poisson sets the irreducible data-fidelity floor.","secondary":"T_eff_RMSE_K"},"size_tiers":{"center_spec":{"omega":{"SNR":100,"T_eff_K":5500,"N_lambda":5000,"log_g_cgs":4.0},"input_format":"measurement_only","problem_class":"nonlinear_inverse","forward_operator":"radiative_transfer_spectral","epsilon_fn_center":"1.15 spectral_chi2_reduced"},"omega_bounds":{"SNR":[10,500],"T_eff_K":[3500,7500],"N_lambda":[1000,50000],"log_g_cgs":[1.0,5.0]},"epsilon_bounds":{"spectral_chi2_reduced":[0.8,5.0]},"allowed_problem_classes":["nonlinear_inverse"],"allowed_omega_dimensions":["N_lambda","T_eff_K","log_g_cgs","SNR"],"allowed_forward_operators":["radiative_transfer_spectral"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":50000.0,"metric":"spectral_chi2_reduced"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x5fb66349c542ef26e19324c512acc166e8899083bdfe422729638d56682f845c","chain_tx_hash":"0x07de7824abdecdaadb29394b675b2c80f0de7f152526d1cca6f6443dc1f6cb15","chain_block":41555177}