{"artifact_id":"L1-365","layer":"L1","title":"Cosmological N-body (Large-Scale Structure)","domain":"Astrophysics","sub_domain":"Cosmological simulation","physics_fingerprint":{"L_DAG":3.5,"title":"Cosmological N-body (Large-Scale Structure)","domain":"Astrophysics","carrier":"N/A","primitives":["F.fourier.pm_gravity","S.tree.force_softening","O.leapfrog.comoving"],"sub_domain":"Cosmological simulation","noise_model":"cosmic_variance","problem_class":"parameter_estimation","solution_space":"3D_dark_matter_density","difficulty_delta":5,"integration_axis":"comoving_time","sensing_mechanism":"pm_tree_gravity"},"observable_profile":{"metric":"matter_power_spectrum_P_k_chi2","regime":"Existence of the recovered 3D_dark_matter_density 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 ~= 10000.0); cosmological_parameter_uncertainty dominates the stability cliff; the remaining mismatch parameters contribute higher-order bias terms. Cosmic variance sets the irreducible data-fidelity floor.","secondary":"halo_mass_function_error"},"size_tiers":{"center_spec":{"omega":{"Omega_m":0.3,"sigma_8":0.8,"N_particles":134217728,"box_size_Mpc_h":250.0},"input_format":"measurement_only","problem_class":"parameter_estimation","forward_operator":"pm_tree_gravity","epsilon_fn_center":"1.02 matter_power_spectrum_P_k_chi2"},"omega_bounds":{"Omega_m":[0.2,0.5],"sigma_8":[0.6,1.0],"N_particles":[262144,8589934592],"box_size_Mpc_h":[50,2000]},"epsilon_bounds":{"matter_power_spectrum_P_k_chi2":[0.9,1.5]},"allowed_problem_classes":["parameter_estimation"],"allowed_omega_dimensions":["N_particles","box_size_Mpc_h","Omega_m","sigma_8"],"allowed_forward_operators":["pm_tree_gravity"]},"hardness_fn":{"type":"epsilon_fn","delta":5,"kappa":100000000.0,"metric":"matter_power_spectrum_P_k_chi2"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x5eaf872422d70c8c95f19857af65a6a30c2ca15580c7ffbe8f8e2fd5740a8e78","chain_tx_hash":"0x287c23d7c0934b4ae7f925e4e0ad660ae6ca5ba15542041f1afd30a62d551832","chain_block":41555176}