{"paper":{"title":"Reconstructing the Cosmic Equation of State from Supernova distances","license":"","headline":"","cross_cats":["gr-qc","hep-ph"],"primary_cat":"astro-ph","authors_text":"(2) Landau Institute, 3) ((1) IUCAA, (3) MPIfA, A. A. Starobinsky (2, Garching), Moscow, Pune, Somak Raychaudhury (1), Tarun Deep Saini (1), Varun Sahni (1)","submitted_at":"1999-10-13T14:48:24Z","abstract_excerpt":"Observations of high-redshift supernovae indicate that the universe is accelerating. Here we present a {\\em model-independent} method for estimating the form of the potential $V(\\phi)$ of the scalar field driving this acceleration, and the associated equation of state $w_\\phi$. Our method is based on a versatile analytical form for the luminosity distance $D_L$, optimized to fit observed distances to distant supernovae and differentiated to yield $V(\\phi)$ and $w_\\phi$. Our results favor $w_\\phi\\simeq -1$ at the present epoch, steadily increasing with redshift. A cosmological constant is consi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/9910231","kind":"arxiv","version":4},"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/9910231/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"}