{"work":{"id":"c23068cf-293d-4b0f-8e7e-8b6c29bb8b64","openalex_id":null,"doi":null,"arxiv_id":"gr-qc/0610130","raw_key":null,"title":"Classical central extension for asymptotic symmetries at null infinity in three spacetime dimensions","authors":null,"authors_text":"G","year":2006,"venue":"gr-qc","abstract":"The symmetry algebra of asymptotically flat spacetimes at null infinity in three dimensions is the semi-direct sum of the infinitesimal diffeomorphisms on the circle with an abelian ideal of supertranslations. The associated charge algebra is shown to admit a non trivial classical central extension of Virasoro type closely related to that of the anti-de Sitter case.","external_url":"https://arxiv.org/abs/gr-qc/0610130","cited_by_count":null,"metadata_source":"pith","metadata_fetched_at":"2026-07-10T20:37:34.208846+00:00","pith_arxiv_id":"gr-qc/0610130","created_at":"2026-05-10T12:30:23.499196+00:00","updated_at":"2026-07-10T20:37:34.208846+00:00","title_quality_ok":true,"display_title":"Classical central extension for asymptotic symmetries at null infinity in three spacetime dimensions","render_title":"Classical central extension for asymptotic symmetries at null infinity in three spacetime dimensions"},"hub":{"state":{"work_id":"c23068cf-293d-4b0f-8e7e-8b6c29bb8b64","tier":"hub","tier_reason":"10+ Pith inbound or 1,000+ external citations","pith_inbound_count":16,"external_cited_by_count":null,"distinct_field_count":2,"first_pith_cited_at":"2025-05-22T09:26:12+00:00","last_pith_cited_at":"2026-07-08T19:17:17+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":"2026-08-20T10:40:08.073646+00:00","tier_text":"hub"},"tier":"hub","role_counts":[{"context_role":"background","n":4}],"polarity_counts":[{"context_polarity":"background","n":4}],"runs":{},"summary":{},"graph":{},"authors":[]}}