{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:WH27BZNPNF3LJZDSKVYPVTRWNW","short_pith_number":"pith:WH27BZNP","schema_version":"1.0","canonical_sha256":"b1f5f0e5af6976b4e4725570face366dabfab7c6f9a9763fd073ebf00d295953","source":{"kind":"arxiv","id":"2603.17654","version":2},"attestation_state":"computed","paper":{"title":"Modified Friedmann equations and non-singular cosmologies in $d=4$ non-polynomial quasi-topological gravities","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"gr-qc","authors_text":"Jo\\~ao Magueijo, Johanna Borissova","submitted_at":"2026-03-18T12:19:14Z","abstract_excerpt":"Quasi-topological theories of gravity are known to resolve black-hole singularities. We investigate whether the same mechanism can remove cosmological singularities. Focusing on non-polynomial curvature quasi-topological gravities in $d=4$ dimensions, we find three generic scenarios with the correct infrared limit but without a Big-Bang singularity, for universes filled with pure radiation or other standard matter. The first scenario yields a universe emerging from a de Sitter phase, a case for which the curvature invariants remain finite but the matter density diverges, albeit only at infinit"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2603.17654","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2026-03-18T12:19:14Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"27abddb9e2f4cec7b787e135b6b577668563ca8b4cec78944b3899672ceee4ff","abstract_canon_sha256":"82c031073ec1dce33486701ecd59d8d8c76289de643c69f95903a406821bfc81"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-15T01:20:57.930501Z","signature_b64":"44HRs13To8tXwDhBY++Uu2h2HXByHBqH67ikq/lzmAllrmw0f5hZOtxGpPAsC0G1n18hpErVuCjeXqEo6gqyAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b1f5f0e5af6976b4e4725570face366dabfab7c6f9a9763fd073ebf00d295953","last_reissued_at":"2026-07-15T01:20:57.929600Z","signature_status":"signed_v1","first_computed_at":"2026-07-15T01:20:57.929600Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Modified Friedmann equations and non-singular cosmologies in $d=4$ non-polynomial quasi-topological gravities","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"gr-qc","authors_text":"Jo\\~ao Magueijo, Johanna Borissova","submitted_at":"2026-03-18T12:19:14Z","abstract_excerpt":"Quasi-topological theories of gravity are known to resolve black-hole singularities. We investigate whether the same mechanism can remove cosmological singularities. Focusing on non-polynomial curvature quasi-topological gravities in $d=4$ dimensions, we find three generic scenarios with the correct infrared limit but without a Big-Bang singularity, for universes filled with pure radiation or other standard matter. The first scenario yields a universe emerging from a de Sitter phase, a case for which the curvature invariants remain finite but the matter density diverges, albeit only at infinit"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2603.17654","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2603.17654/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2603.17654","created_at":"2026-07-15T01:20:57.930032+00:00"},{"alias_kind":"arxiv_version","alias_value":"2603.17654v2","created_at":"2026-07-15T01:20:57.930032+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2603.17654","created_at":"2026-07-15T01:20:57.930032+00:00"},{"alias_kind":"pith_short_12","alias_value":"WH27BZNPNF3L","created_at":"2026-07-15T01:20:57.930032+00:00"},{"alias_kind":"pith_short_16","alias_value":"WH27BZNPNF3LJZDS","created_at":"2026-07-15T01:20:57.930032+00:00"},{"alias_kind":"pith_short_8","alias_value":"WH27BZNP","created_at":"2026-07-15T01:20:57.930032+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":8,"internal_anchor_count":8,"sample":[{"citing_arxiv_id":"2606.22404","citing_title":"Null geodesic defocusing in dynamical black-hole-to-white-hole transitions","ref_index":48,"is_internal_anchor":true},{"citing_arxiv_id":"2606.17784","citing_title":"Quasi-topological gravity for 4-dimensional Taub-NUT, near-horizon extreme Kerr, and swirling symmetries","ref_index":41,"is_internal_anchor":true},{"citing_arxiv_id":"2603.06786","citing_title":"All $2D$ generalised dilaton theories from $d\\geq 4$ gravities","ref_index":79,"is_internal_anchor":true},{"citing_arxiv_id":"2604.02631","citing_title":"Proca-Maxwell System in an Infinite Tower of Higher-Derivative Gravity","ref_index":101,"is_internal_anchor":true},{"citing_arxiv_id":"2604.26166","citing_title":"Scattering of electromagnetic field in quasi-topological gravity","ref_index":18,"is_internal_anchor":true},{"citing_arxiv_id":"2604.13002","citing_title":"Cosmologically viable non-polynomial quasi-topological gravity: explicit models, $\\Lambda$CDM limit and observational constraints","ref_index":80,"is_internal_anchor":true},{"citing_arxiv_id":"2604.04601","citing_title":"Cosmic Inflation From Regular Black Holes","ref_index":47,"is_internal_anchor":true},{"citing_arxiv_id":"2604.13613","citing_title":"From Ringdown to Lensing: Analytic Eikonal Modes of Quasi-Topological Regular Black Holes","ref_index":13,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/WH27BZNPNF3LJZDSKVYPVTRWNW","json":"https://pith.science/pith/WH27BZNPNF3LJZDSKVYPVTRWNW.json","graph_json":"https://pith.science/api/pith-number/WH27BZNPNF3LJZDSKVYPVTRWNW/graph.json","events_json":"https://pith.science/api/pith-number/WH27BZNPNF3LJZDSKVYPVTRWNW/events.json","paper":"https://pith.science/paper/WH27BZNP"},"agent_actions":{"view_html":"https://pith.science/pith/WH27BZNPNF3LJZDSKVYPVTRWNW","download_json":"https://pith.science/pith/WH27BZNPNF3LJZDSKVYPVTRWNW.json","view_paper":"https://pith.science/paper/WH27BZNP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2603.17654&json=true","fetch_graph":"https://pith.science/api/pith-number/WH27BZNPNF3LJZDSKVYPVTRWNW/graph.json","fetch_events":"https://pith.science/api/pith-number/WH27BZNPNF3LJZDSKVYPVTRWNW/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/WH27BZNPNF3LJZDSKVYPVTRWNW/action/timestamp_anchor","attest_storage":"https://pith.science/pith/WH27BZNPNF3LJZDSKVYPVTRWNW/action/storage_attestation","attest_author":"https://pith.science/pith/WH27BZNPNF3LJZDSKVYPVTRWNW/action/author_attestation","sign_citation":"https://pith.science/pith/WH27BZNPNF3LJZDSKVYPVTRWNW/action/citation_signature","submit_replication":"https://pith.science/pith/WH27BZNPNF3LJZDSKVYPVTRWNW/action/replication_record"}},"created_at":"2026-07-15T01:20:57.930032+00:00","updated_at":"2026-07-15T01:20:57.930032+00:00"}