{"work":{"id":"de94094e-705f-4706-9e93-ce985ef85cf0","openalex_id":null,"doi":null,"arxiv_id":"hep-ph/0110002","raw_key":null,"title":"Generating the curvature perturbation without an inflaton","authors":null,"authors_text":"D","year":2001,"venue":"hep-ph","abstract":"We present a mechanism for the origin of the large-scale curvature perturbation in our Universe by the late decay of a massive scalar field, the curvaton. The curvaton is light during a period of cosmological inflation, when it acquires a perturbation with an almost scale-invariant spectrum. This corresponds initially to an isocurvature density perturbation, which generates the curvature perturbation after inflation when the curvaton density becomes a significant fraction of the total. The isocurvature density perturbation disappears if the curvaton completely decays into thermalised radiation. Any residual isocurvature perturbation is 100% correlated with the curvature. The same mechanism can also generate the curvature perturbation in pre big bang/ekpyrotic models, provided that the curvaton has a suitable non-canonical kinetic term so as to generate a flat spectrum.","external_url":"https://arxiv.org/abs/hep-ph/0110002","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-05-24T23:55:07.226518+00:00","pith_arxiv_id":"hep-ph/0110002","created_at":"2026-05-10T23:20:50.440232+00:00","updated_at":"2026-06-05T21:23:00.469572+00:00","title_quality_ok":true,"display_title":"Generating the curvature perturbation without an inflaton","render_title":"Generating the curvature perturbation without an inflaton"},"hub":{"state":{"work_id":"de94094e-705f-4706-9e93-ce985ef85cf0","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":10,"external_cited_by_count":null,"distinct_field_count":4,"first_pith_cited_at":"2019-07-10T01:01:01+00:00","last_pith_cited_at":"2026-05-11T18:00:03+00:00","author_build_status":"not_needed","summary_status":"needed","contexts_status":"needed","graph_status":"needed","ask_index_status":"not_needed","reader_status":"not_needed","recognition_status":"not_needed","updated_at":"2026-05-26T14:36:46.321091+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":6}],"polarity_counts":[{"context_polarity":"background","n":6}],"runs":{},"summary":{},"graph":{},"authors":[]}}