{"paper":{"title":"Graduated dark energy: Observational hints of a spontaneous sign switch in the cosmological constant","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","hep-ph","hep-th"],"primary_cat":"astro-ph.CO","authors_text":"J. Alberto Vazquez, John D. Barrow, Luis A. Escamilla, Ozgur Akarsu","submitted_at":"2019-12-18T17:31:25Z","abstract_excerpt":"We study the cosmological constant ($\\Lambda$) in the standard $\\Lambda$CDM model by introducing the \\textit{graduated dark energy} (gDE) characterised by a minimal dynamical deviation from the null inertial mass density of the $\\Lambda$ in the form $\\rho_{\\rm inert}\\propto \\rho^{\\lambda}<0$ with $\\lambda<1$ being a ratio of two odd integers, for which its energy density $\\rho$ dynamically takes negative values in the finite past. For large negative values of $\\lambda$, it creates a phenomenological model described by a smooth function that approximately describes the $\\Lambda$ spontaneously s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.08751","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/1912.08751/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"}