{"paper":{"title":"Newtonian limit of scalar-tensor theories and galactic dynamics: isolated and interacting galaxies","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"J. Klapp, J.L. Cervantes-Cota, M.A. Rodriguez-Meza, R. Gabbasov","submitted_at":"2007-04-19T18:18:39Z","abstract_excerpt":"We use the Newtonian limit of a general scalar-tensor theory around a background field to study astrophysical effects. The gravitational theory modifies the standard Newtonian potential by adding a Yukawa term to it, which is quantified by two theoretical parameters: $\\lambda$, the lenghtscale of the gravitational interaction and its strength, $\\alpha$. Within this formalism we firstly present a numerical study on the formation of bars in isolated galaxies. We have found for positive $\\alpha$ that the modified gravity destabilizes the galactic discs and leads to rapid bar formation in isolated"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0704.2579","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"}