{"paper":{"title":"No evidence for the evolution of mass density power-law index $\\gamma$ from strong gravitational lensing observation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc"],"primary_cat":"astro-ph.CO","authors_text":"Hai-Li Li, Jing-Lei Cui, Xin Zhang","submitted_at":"2017-04-25T10:21:00Z","abstract_excerpt":"In this paper, we consider the singular isothermal sphere lensing model that has a spherically symmetric power-law mass distribution $\\rho_{tot}(r)\\sim r^{-\\gamma}$. We investigate whether the mass density power-law index $\\gamma$ is cosmologically evolutionary by using the strong gravitational lensing (SGL) observation, in combination with other cosmological observations. We also check whether the constraint result of $\\gamma$ is affected by the cosmological model, by considering several simple dynamical dark energy models. We find that the constraint on $\\gamma$ is mainly decided by the SGL "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.07614","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"}