{"paper":{"title":"A new generic evolution for $k$-essence dark energy with $w \\approx -1$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"gr-qc","authors_text":"John Kehayias, Robert J. Scherrer","submitted_at":"2019-05-14T14:14:15Z","abstract_excerpt":"We reexamine $k$-essence dark energy models with a scalar field $\\phi$ and a factorized Lagrangian, $\\mathcal L = V(\\phi)F(X)$, with $X = \\frac{1}{2} \\nabla_\\mu \\phi \\nabla^\\mu \\phi.$ A value of the equation of state parameter, $w$, near $-1$ requires either $X \\approx 0$ or $dF/dX \\approx 0$. Previous work showed that thawing models with $X \\approx 0$ evolve along a set of unique trajectories for $w(a)$, while those with $dF/dX \\approx 0$ can result in a variety of different forms for $w(a)$. We show that if $dV/d\\phi$ is small and $(1/V)(dV/d\\phi)$ is roughly constant, then the latter models"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.05628","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":""},"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"}