{"artifact_id":"L1-376","layer":"L1","title":"Cosmic Ray Propagation Inversion","domain":"Astrophysics","sub_domain":"Cosmic rays","physics_fingerprint":{"L_DAG":3.2,"title":"Cosmic Ray Propagation Inversion","domain":"Astrophysics","carrier":"particle","primitives":["S.diffusion.galactic","G.structured","O.chi2.cr_ratios"],"sub_domain":"Cosmic rays","noise_model":"observation_gaussian","problem_class":"parameter_estimation","solution_space":"CR_spectral_source_distribution","difficulty_delta":3,"integration_axis":"galactic_volume","sensing_mechanism":"diffusion_loss_transport"},"observable_profile":{"metric":"B_over_C_chi2","regime":"Existence of the recovered CR_spectral_source_distribution 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 ~= 50); solar_modulation_uncertainty dominates the stability cliff; the remaining mismatch parameters contribute higher-order bias terms. Observation gaussian sets the irreducible data-fidelity floor.","secondary":"positron_fraction_chi2"},"size_tiers":{"center_spec":{"omega":{"D_0_cm2_s":30000000000000000000000000000,"z_halo_kpc":4.0,"solar_phi_GV":0.5,"delta_diffusion":0.35},"input_format":"measurement_only","problem_class":"parameter_estimation","forward_operator":"diffusion_loss_transport","epsilon_fn_center":"1.3 B_over_C_chi2"},"omega_bounds":{"D_0_cm2_s":[10000000000000000000000000000,100000000000000000000000000000],"z_halo_kpc":[2.0,8.0],"solar_phi_GV":[0.3,1.5],"delta_diffusion":[0.2,0.6]},"epsilon_bounds":{"B_over_C_chi2":[0.8,3.0]},"allowed_problem_classes":["parameter_estimation"],"allowed_omega_dimensions":["D_0_cm2_s","delta_diffusion","z_halo_kpc","solar_phi_GV"],"allowed_forward_operators":["diffusion_loss_transport"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"kappa":1000,"metric":"B_over_C_chi2"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x58d9b143d8d8ae3812b97c7640829efa78025eade0df37cbe9857437fa8c026c","chain_tx_hash":"0xf6dc5c68c3e2e1c4e463c6d2434cd78b52f5036f66f2c9601423f5280ed3827d","chain_block":41555178}