{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:CXK7DFDYXQ6IEJ4Q5O4IZFFVXS","short_pith_number":"pith:CXK7DFDY","schema_version":"1.0","canonical_sha256":"15d5f19478bc3c822790ebb88c94b5bc8abddffa5603c16a233a4df67a4ca80f","source":{"kind":"arxiv","id":"1805.03503","version":1},"attestation_state":"computed","paper":{"title":"Can the apparent expansion of the Universe be attributed to an increasing vacuum refractive index ?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.gen-ph","authors_text":"A. Djannati-Atai, F. Couchot, M. Urban, X. Sarazin","submitted_at":"2018-05-03T14:48:19Z","abstract_excerpt":"H.A. Wilson, then R.H. Dicke, proposed to describe gravitation by a spatial change of the refractive index of the vacuum around a gravitational mass. Dicke extended this formalism in order to describe the apparent expansion of the Universe by a cosmological time dependence of the global vacuum index. In this paper, we develop Dicke's formalism. The metric expansion in standard cosmology (the time-dependent scale factor of the Friedmann-Lema\\^itre curved spacetime metric) is replaced by a flat and static Euclidean metric with a change with time of the vacuum index. We show that a vacuum index i"},"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":"1805.03503","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.gen-ph","submitted_at":"2018-05-03T14:48:19Z","cross_cats_sorted":[],"title_canon_sha256":"5fa725b77f0a42e930425594716f1c42457d9f86949ffbe8e14c004244c7d46c","abstract_canon_sha256":"5b88a62cd38e60a0eff6a4d4ea6368f9eb46d1b58e38b4cc0178b9df912b2601"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:14:13.642064Z","signature_b64":"EzzVEq4owXj01/BvvvQhmnZZfFaoemwo5fFkdiM5y0wHLvVRbE4xvayA5DDoBLHe1F7xhMFJVr61hW1ZB/tJDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"15d5f19478bc3c822790ebb88c94b5bc8abddffa5603c16a233a4df67a4ca80f","last_reissued_at":"2026-05-18T00:14:13.641383Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:14:13.641383Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Can the apparent expansion of the Universe be attributed to an increasing vacuum refractive index ?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.gen-ph","authors_text":"A. Djannati-Atai, F. Couchot, M. Urban, X. Sarazin","submitted_at":"2018-05-03T14:48:19Z","abstract_excerpt":"H.A. Wilson, then R.H. Dicke, proposed to describe gravitation by a spatial change of the refractive index of the vacuum around a gravitational mass. Dicke extended this formalism in order to describe the apparent expansion of the Universe by a cosmological time dependence of the global vacuum index. In this paper, we develop Dicke's formalism. The metric expansion in standard cosmology (the time-dependent scale factor of the Friedmann-Lema\\^itre curved spacetime metric) is replaced by a flat and static Euclidean metric with a change with time of the vacuum index. We show that a vacuum index i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.03503","kind":"arxiv","version":1},"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":"1805.03503","created_at":"2026-05-18T00:14:13.641496+00:00"},{"alias_kind":"arxiv_version","alias_value":"1805.03503v1","created_at":"2026-05-18T00:14:13.641496+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.03503","created_at":"2026-05-18T00:14:13.641496+00:00"},{"alias_kind":"pith_short_12","alias_value":"CXK7DFDYXQ6I","created_at":"2026-05-18T12:32:19.392346+00:00"},{"alias_kind":"pith_short_16","alias_value":"CXK7DFDYXQ6IEJ4Q","created_at":"2026-05-18T12:32:19.392346+00:00"},{"alias_kind":"pith_short_8","alias_value":"CXK7DFDY","created_at":"2026-05-18T12:32:19.392346+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS","json":"https://pith.science/pith/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS.json","graph_json":"https://pith.science/api/pith-number/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS/graph.json","events_json":"https://pith.science/api/pith-number/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS/events.json","paper":"https://pith.science/paper/CXK7DFDY"},"agent_actions":{"view_html":"https://pith.science/pith/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS","download_json":"https://pith.science/pith/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS.json","view_paper":"https://pith.science/paper/CXK7DFDY","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1805.03503&json=true","fetch_graph":"https://pith.science/api/pith-number/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS/graph.json","fetch_events":"https://pith.science/api/pith-number/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS/action/timestamp_anchor","attest_storage":"https://pith.science/pith/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS/action/storage_attestation","attest_author":"https://pith.science/pith/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS/action/author_attestation","sign_citation":"https://pith.science/pith/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS/action/citation_signature","submit_replication":"https://pith.science/pith/CXK7DFDYXQ6IEJ4Q5O4IZFFVXS/action/replication_record"}},"created_at":"2026-05-18T00:14:13.641496+00:00","updated_at":"2026-05-18T00:14:13.641496+00:00"}