{"paper":{"title":"Additional bounds on the pre Big--Bang--Nucleosynthesis Expansion by means of $\\gamma$-rays from the Galactic Center","license":"","headline":"","cross_cats":["astro-ph"],"primary_cat":"hep-ph","authors_text":"F. Donato, M. Schelke, N. Fornengo","submitted_at":"2006-12-29T17:33:02Z","abstract_excerpt":"The possibility to use $\\gamma$--ray data from the Galactic Center (GC) to constrain the cosmological evolution of the Universe in a phase prior to primordial nucleosyntesis, namely around the time of cold dark matter (CDM) decoupling, is analyzed. The basic idea is that in a modified cosmological scenario, where the Hubble expansion rate is enhanced with respect to the standard case, the CDM decoupling is anticipated and the relic abundance of a given dark matter (DM) candidate enhanced. This implies that the present amount of CDM in the Universe may be explained by a Weakly Interacting Massi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0612374","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"}