{"paper":{"title":"Supernova Limits on the Cosmic Equation of State","license":"","headline":"","cross_cats":["gr-qc","hep-ph"],"primary_cat":"astro-ph","authors_text":"(10) Univ. Hawaii, (11) UCSB), (2) Univ. Catolica, (3) Univ. Washington, (4) UCB, (5) STScI, (6) ESO, (7) CTIO, (8) MSSSO, (9) Univ. Michigan, A. Clocchiatti (2), A. Diercks (3), A. G. Riess (4), A. V. Filippenko (4), B. Leibundgut (6), B. P. Schmidt (8), C. J. Hogan (3), C. Stubbs (3), D. Reiss (3), J. Spyromilio (6), J. Tonry (10), M.M. Phillips (7), N. B. Suntzeff (7), P. Challis (1), P. M. Garnavich (1), R. A. Schommer (7), R. C. Smith (9), R. L. Gilliland (5), R. P. Kirshner (1), S. Jha (1), S. M. Carroll (11) ((1) CfA","submitted_at":"1998-06-30T19:03:36Z","abstract_excerpt":"We use Type Ia supernovae studied by the High-Z Supernova Search Team to constrain the properties of an energy component which may have contributed to accelerating the cosmic expansion. We find that for a flat geometry the equation of state parameter for the unknown component, alpha_x=P_x/rho_x, must be less than -0.55 (95% confidence) for any value of Omega_m and is further limited to alpha_x<-0.60 (95%) if Omega_m is assumed to be greater than 0.1 . These values are inconsistent with the unknown component being topological defects such as domain walls, strings, or textures. The supernova dat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9806396","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/9806396/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}