{"artifact_id":"L1-364","layer":"L1","title":"N-body Gravitational Simulation","domain":"Astrophysics","sub_domain":"Orbital dynamics","physics_fingerprint":{"L_DAG":3.0,"title":"N-body Gravitational Simulation","domain":"Astrophysics","carrier":"N/A","primitives":["F.gravity.nbody","S.tree.barnes_hut","O.leapfrog.integrator"],"sub_domain":"Orbital dynamics","noise_model":"observation_gaussian","problem_class":"parameter_estimation","solution_space":"6N_phase_space","difficulty_delta":3,"integration_axis":"time","sensing_mechanism":"gravitational_force_summation"},"observable_profile":{"metric":"orbital_energy_conservation_relative","regime":"Existence of the recovered 6N_phase_space 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); initial_condition_uncertainty dominates the stability cliff; the remaining mismatch parameters contribute higher-order bias terms. Observation gaussian sets the irreducible data-fidelity floor.","secondary":"position_RMSE_AU"},"size_tiers":{"center_spec":{"omega":{"dt_yr":0.01,"N_bodies":100,"t_end_yr":100.0,"softening_AU":0.1},"input_format":"measurement_only","problem_class":"parameter_estimation","forward_operator":"gravitational_force_summation","epsilon_fn_center":"1e-6 orbital_energy_conservation_relative"},"omega_bounds":{"dt_yr":[0.001,0.1],"N_bodies":[10,10000],"t_end_yr":[10,10000],"softening_AU":[0.01,1.0]},"epsilon_bounds":{"orbital_energy_conservation_relative":[1e-10,0.001]},"allowed_problem_classes":["parameter_estimation"],"allowed_omega_dimensions":["N_bodies","dt_yr","softening_AU","t_end_yr"],"allowed_forward_operators":["gravitational_force_summation"]},"hardness_fn":{"type":"epsilon_fn","delta":3,"kappa":100000.0,"metric":"orbital_energy_conservation_relative"},"initiator_dataset":[{"name":"primary","weight":1.0,"ipfs_cid":null,"license_hash":null}],"status":"testnet","staked_pwm":0.0,"chain_hash":"0x63131da3973889de4d4c05e7deab5eac1b2dad7dcb58980a385f24ff7b1e1bd5","chain_tx_hash":"0x7da15624c8618e308950b5083db53d3625dac3b115d254c571f4138589bd2402","chain_block":41555176}