{"id":"W3100585134","doi":"","title":"All spacetimes with vanishing curvature invariants","year":2002,"lang":"en","type":"article","venue":"CERN Document Server (European Organization for Nuclear Research)","topic":"Black Holes and Theoretical Physics","field":"Physics and Astronomy","cited_by":88,"is_retracted":false,"has_abstract":true,"ca_institutions":"Dalhousie University","funders":"","keywords":"Physics; Covariant transformation; Riemann curvature tensor; Mathematical physics; Curvature; Riemann hypothesis; Tensor (intrinsic definition); Classical mechanics; Pure mathematics; Geometry","routes":{"ca_aff":true,"ca_fund":false,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"codex-gemma-dda1882f352a","candidate_categories":["insufficient_payload"],"consensus_categories":["insufficient_payload"],"category_scores_codex":[0.0002892602,0.0001683199,0.0001423707,0.00005270592,0.0005270909,0.0006693482,0.0005035043,0.00003246988,0.01486456],"category_scores_gemma":[0.00002193315,0.0001444762,0.00005025976,0.0003638726,0.0001268804,0.000457134,0.000367606,0.0003060051,0.002506337],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.00004857827,"about_ca_system_score_gemma":0.000004889543,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.00002450696,"about_ca_topic_score_gemma":3.416009e-7,"domain_scores_codex":[0.9985511,0.0001758804,0.0001630515,0.0003478719,0.0003573771,0.0004047145],"domain_scores_gemma":[0.9990882,0.00003168073,0.0000730262,0.000373747,0.0002550956,0.0001782962],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"theoretical_or_conceptual","study_design_gemma":"theoretical_or_conceptual","study_design_scores_codex":[0.00001811411,0.000143394,0.00036652,0.00002007639,0.00009336675,0.000003470026,0.0006221454,0.00003645674,0.00002474853,0.9906049,0.0075677,0.0004990913],"study_design_scores_gemma":[0.003520143,0.0006403746,0.002728351,0.00019254,0.0001439745,0.00000992867,0.001403199,0.0001190844,0.002503554,0.8223709,0.1653096,0.001058277],"study_design_candidate":"theoretical_or_conceptual","study_design_consensus":"theoretical_or_conceptual","genre_codex":"empirical","genre_gemma":"empirical","genre_scores_codex":[0.8858943,0.00005757332,0.0004744081,0.005277689,0.000155,0.001039522,0.00001712338,0.0004095851,0.1066748],"genre_scores_gemma":[0.9967037,0.000008477418,0.00004084659,0.0002181847,0.0002665991,5.379792e-7,0.0001556016,0.0002786459,0.002327397],"genre_candidate":"empirical","genre_consensus":"empirical","teacher_disagreement_score":0.168234,"threshold_uncertainty_score":0.9982703,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.02088738899425369,"score_gpt":0.2425612112968558,"score_spread":0.2216738223026021,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). Scores rank; they never assert a category."}}