{"paper":{"title":"Testing a dissipative kinetic k-essence model","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"gr-qc","authors_text":"J. R. Villanueva, N. Cruz, V. H. Cardenas","submitted_at":"2015-03-12T17:43:24Z","abstract_excerpt":"In this work, we present a study of a purely kinetic k-essence model, characterized basically by a parameter $\\alpha$ in presence of a bulk dissipative term, whose relationship between viscous pressure $\\Pi$ and energy density $\\rho$ of the background follows a polytropic type law $\\Pi \\propto \\rho^{\\lambda+1/2}$, where $\\lambda$, in principle, is a parameter without restrictions. Analytical solutions for the energy density of the k-essence field are found in two specific cases: $\\lambda=1/2$ and $\\lambda=(1-\\alpha)/2\\alpha$, and then we show that these solutions posses the same functional for"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1503.03826","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":""},"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"}