{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:JRJZE34KOQNRQCG5JP74MPAWF2","short_pith_number":"pith:JRJZE34K","schema_version":"1.0","canonical_sha256":"4c53926f8a741b1808dd4bffc63c162e9fadab7279556b13d2e19055d224a904","source":{"kind":"arxiv","id":"1809.04501","version":2},"attestation_state":"computed","paper":{"title":"Primordial gravitational waves and the H0-tension problem","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Jailson S. Alcaniz, Leila L. Graef, Micol Benetti","submitted_at":"2018-09-12T14:56:37Z","abstract_excerpt":"We analyse the H0-tension problem in the context of models of the early universe that predict a blue tilted spectrum of primordial gravitational waves (GW's). By considering the GW's contribution, Neff^GW, to the effective number of relativistic degrees of freedom, Neff, and assuming standard particle physics, we discuss the effects of Neff^GW on the background expansion, especially the constraints on the Hubble parameter H0. We analyse three scenarios which take into account the contribution of Neff^GW and perform a statistical study using recent data of cosmic microwave background, baryon ac"},"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":"1809.04501","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-09-12T14:56:37Z","cross_cats_sorted":[],"title_canon_sha256":"8b6267343ac39de773e37dcf8ea65e9ef45226f25bf613cd0f3fb22477c418fd","abstract_canon_sha256":"2d6fb16c00de20228ad91254ce8de669f700849ea1153abc683b7c0254cb8102"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:53:50.811108Z","signature_b64":"kT435Ag4A/hzfW4oRboys5ujEmS3HdZATG/4rGIjkfjYNv/qlEZSfJPk1rsnq83/C6ygGif6C5gierTOdF1zAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4c53926f8a741b1808dd4bffc63c162e9fadab7279556b13d2e19055d224a904","last_reissued_at":"2026-05-17T23:53:50.810357Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:53:50.810357Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Primordial gravitational waves and the H0-tension problem","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Jailson S. Alcaniz, Leila L. Graef, Micol Benetti","submitted_at":"2018-09-12T14:56:37Z","abstract_excerpt":"We analyse the H0-tension problem in the context of models of the early universe that predict a blue tilted spectrum of primordial gravitational waves (GW's). By considering the GW's contribution, Neff^GW, to the effective number of relativistic degrees of freedom, Neff, and assuming standard particle physics, we discuss the effects of Neff^GW on the background expansion, especially the constraints on the Hubble parameter H0. We analyse three scenarios which take into account the contribution of Neff^GW and perform a statistical study using recent data of cosmic microwave background, baryon ac"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1809.04501","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":""},"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":"1809.04501","created_at":"2026-05-17T23:53:50.810476+00:00"},{"alias_kind":"arxiv_version","alias_value":"1809.04501v2","created_at":"2026-05-17T23:53:50.810476+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1809.04501","created_at":"2026-05-17T23:53:50.810476+00:00"},{"alias_kind":"pith_short_12","alias_value":"JRJZE34KOQNR","created_at":"2026-05-18T12:32:31.084164+00:00"},{"alias_kind":"pith_short_16","alias_value":"JRJZE34KOQNRQCG5","created_at":"2026-05-18T12:32:31.084164+00:00"},{"alias_kind":"pith_short_8","alias_value":"JRJZE34K","created_at":"2026-05-18T12:32:31.084164+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":2,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2512.04011","citing_title":"Freeze-out and spectral running of primordial gravitational waves in viscous cosmology","ref_index":16,"is_internal_anchor":true},{"citing_arxiv_id":"2604.25813","citing_title":"Geometric Constraints on the Pre-Recombination Expansion History from the Hubble Tension","ref_index":18,"is_internal_anchor":false}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/JRJZE34KOQNRQCG5JP74MPAWF2","json":"https://pith.science/pith/JRJZE34KOQNRQCG5JP74MPAWF2.json","graph_json":"https://pith.science/api/pith-number/JRJZE34KOQNRQCG5JP74MPAWF2/graph.json","events_json":"https://pith.science/api/pith-number/JRJZE34KOQNRQCG5JP74MPAWF2/events.json","paper":"https://pith.science/paper/JRJZE34K"},"agent_actions":{"view_html":"https://pith.science/pith/JRJZE34KOQNRQCG5JP74MPAWF2","download_json":"https://pith.science/pith/JRJZE34KOQNRQCG5JP74MPAWF2.json","view_paper":"https://pith.science/paper/JRJZE34K","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1809.04501&json=true","fetch_graph":"https://pith.science/api/pith-number/JRJZE34KOQNRQCG5JP74MPAWF2/graph.json","fetch_events":"https://pith.science/api/pith-number/JRJZE34KOQNRQCG5JP74MPAWF2/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/JRJZE34KOQNRQCG5JP74MPAWF2/action/timestamp_anchor","attest_storage":"https://pith.science/pith/JRJZE34KOQNRQCG5JP74MPAWF2/action/storage_attestation","attest_author":"https://pith.science/pith/JRJZE34KOQNRQCG5JP74MPAWF2/action/author_attestation","sign_citation":"https://pith.science/pith/JRJZE34KOQNRQCG5JP74MPAWF2/action/citation_signature","submit_replication":"https://pith.science/pith/JRJZE34KOQNRQCG5JP74MPAWF2/action/replication_record"}},"created_at":"2026-05-17T23:53:50.810476+00:00","updated_at":"2026-05-17T23:53:50.810476+00:00"}