{"artifact_id":"L1-375","layer":"L1","title":"Accretion Disk Structure Inversion","domain":"Astrophysics","sub_domain":"Accretion physics","physics_fingerprint":{"L_DAG":4.0,"title":"Accretion Disk Structure Inversion","domain":"Astrophysics","carrier":"photon","primitives":["S.disk.relxill_reflection","F.fourier.power_spectrum","O.chi2.x_ray_spectrum"],"sub_domain":"Accretion physics","noise_model":"shot_poisson","problem_class":"nonlinear_inverse","solution_space":"1D_disk_emissivity_profile","difficulty_delta":5,"integration_axis":"radial_disk","sensing_mechanism":"x_ray_spectral_timing"},"observable_profile":{"metric":"spin_constraint_sigma","regime":"Existence of the recovered 1D_disk_emissivity_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); pile_up_contamination dominates the stability cliff; the remaining mismatch parameters contribute higher-order bias terms. Shot poisson sets the irreducible data-fidelity floor.","secondary":"spectral_chi2_reduced"},"size_tiers":{"center_spec":{"omega":{"SNR_per_bin":20,"spin_a_star":0.7,"N_counts_total":1000000.0,"inclination_deg":40},"input_format":"measurement_only","problem_class":"nonlinear_inverse","forward_operator":"x_ray_spectral_timing","epsilon_fn_center":"1.1 spectral_chi2_reduced"},"omega_bounds":{"SNR_per_bin":[5,100],"spin_a_star":[0.0,0.998],"N_counts_total":[10000.0,100000000.0],"inclination_deg":[5,80]},"epsilon_bounds":{"spectral_chi2_reduced":[0.8,3.0]},"allowed_problem_classes":["nonlinear_inverse"],"allowed_omega_dimensions":["N_counts_total","spin_a_star","inclination_deg","SNR_per_bin"],"allowed_forward_operators":["x_ray_spectral_timing"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":10000.0,"metric":"spin_constraint_sigma"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0xda64759d65ad666578c30849ca0830255f49522683040122a3dd95cdff3ba7cd","chain_tx_hash":"0xf0cbfede7c123078bbf410e26c6cbbfa5aa4997af7e4567074cd08595556984c","chain_block":41555178}