{"work":{"id":"559f027b-c6cd-4fff-a4e1-dd809aeca291","openalex_id":null,"doi":null,"arxiv_id":"1110.5249","raw_key":null,"title":"Towards singularity and ghost free theories of gravity","authors":null,"authors_text":"Biswas T, Gerwick E, Koivisto T and Mazumdar A","year":2011,"venue":"gr-qc","abstract":"We present the most general covariant ghost-free gravitational action in a Minkowski vacuum. Apart from the much studied f(R) models, this includes a large class of non-local actions with improved UV behavior, which nevertheless recover Einstein's general relativity in the IR.","external_url":"https://arxiv.org/abs/1110.5249","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-05-24T17:19:43.749042+00:00","pith_arxiv_id":"1110.5249","created_at":"2026-05-10T11:30:19.211958+00:00","updated_at":"2026-05-24T17:19:43.749042+00:00","title_quality_ok":true,"display_title":"Biswas, E","render_title":"Biswas, E"},"hub":{"state":{"work_id":"559f027b-c6cd-4fff-a4e1-dd809aeca291","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":11,"external_cited_by_count":null,"distinct_field_count":3,"first_pith_cited_at":"2015-01-28T21:00:11+00:00","last_pith_cited_at":"2026-05-21T17:53:53+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":"2026-05-26T01:46:15.754910+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":[]}}