{"paper":{"title":"Testing dark energy beyond the cosmological constant barrier","license":"","headline":"","cross_cats":["gr-qc","hep-th"],"primary_cat":"astro-ph","authors_text":"J. S. Alcaniz (Univ. Fed. do Rio Grande do Norte)","submitted_at":"2003-12-16T17:56:07Z","abstract_excerpt":"Although well motivated from theoretical arguments, the cosmological constant \\emph{barrier}, i.e., the imposition that the equation-of-state parameter of dark energy ($\\omega_x \\equiv p_x/\\rho_x$) is $\\geq -1$, seems to introduce bias in the parameter determination from statistical analyses of observational data. In this regard, \\emph{phantom} dark energy or \\emph{superquintessence} has been proposed in which the usual imposition $\\omega \\geq -1$ is relaxed. Here, we study possible observational limits to the \\emph{phantom} behavior of the dark energy from recent distance estimates of galaxy "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0312424","kind":"arxiv","version":2},"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/0312424/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"}