{"work":{"id":"579ec65d-57f6-489d-99e4-3ebea93a85cb","openalex_id":null,"doi":null,"arxiv_id":"0911.3380","raw_key":null,"title":"Quasi-Single Field Inflation and Non-Gaussianities","authors":null,"authors_text":"Xingang Chen and Yi Wang","year":2009,"venue":"hep-th","abstract":"In quasi-single field inflation models, massive isocurvature modes, that are coupled to the inflaton and have mass of order the Hubble parameter, can have nontrivial impacts on density perturbations, especially non-Gaussianities. We study a simple example of quasi-single field inflation in terms of turning inflaton trajectory. Large bispectra with a one-parameter family of novel shapes arise, lying between the well-known local and equilateral shape. The trispectra can also be very large and its magnitude tNL can be much larger than fNL squared.","external_url":"https://arxiv.org/abs/0911.3380","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-05-25T10:00:36.950996+00:00","pith_arxiv_id":"0911.3380","created_at":"2026-05-10T11:10:08.929754+00:00","updated_at":"2026-05-25T10:00:36.950996+00:00","title_quality_ok":true,"display_title":"Quasi-Single Field Inflation and Non-Gaussianities","render_title":"Quasi-Single Field Inflation and Non-Gaussianities"},"hub":{"state":{"work_id":"579ec65d-57f6-489d-99e4-3ebea93a85cb","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":16,"external_cited_by_count":null,"distinct_field_count":4,"first_pith_cited_at":"2016-10-31T20:47:42+00:00","last_pith_cited_at":"2026-05-20T17:13:10+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":"2026-06-02T13:24:46.923981+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":7}],"polarity_counts":[{"context_polarity":"background","n":7}],"runs":{},"summary":{},"graph":{},"authors":[]}}