{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:5RBVH6BGJBFNFLO5MCPVZPY5RD","short_pith_number":"pith:5RBVH6BG","schema_version":"1.0","canonical_sha256":"ec4353f826484ad2addd609f5cbf1d88d2677bc9e57905ec9abd56154a192d8b","source":{"kind":"arxiv","id":"1703.02579","version":3},"attestation_state":"computed","paper":{"title":"Birefringent light propagation on anisotropic cosmological backgrounds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Felipe A. Asenjo, Sergio A. Hojman","submitted_at":"2017-03-07T20:23:13Z","abstract_excerpt":"Exact electromagnetic wave solutions to Maxwell equations on anisotropic Bianchi I cosmological spacetime backgrounds are studied. The waves evolving on Bianchi I spacetimes exhibit birefringence (associated to linear polarization) and dispersion.\n  The particular case of a vacuum--dominated anisotropic Universe, which reproduces a Friedmann-Robertson-Walker Universe (for late times) while for earlier times it matches a Kasner Universe, is studied. The electromagnetic waves do not, in general, follow null geodesics. This produces a modification of the cosmological redshift, which is now depend"},"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":"1703.02579","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-03-07T20:23:13Z","cross_cats_sorted":[],"title_canon_sha256":"0dbd2359621d475c6850896da42fc962b135cbc9ca6d78dec200a15d0caa5d51","abstract_canon_sha256":"bb7c1ebcbbdcdb96db7c4402289f287aaeeb2f7158edb4344f5e46dfa6535e1b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:37:34.212013Z","signature_b64":"Jcc8AzjRTWUM9VMQnnfTcbqxXSf5lhqCr8/2ivESf4vCsH234vPSmawpDIy+HuY/gMvcfMiuceCt18rzzEP0CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ec4353f826484ad2addd609f5cbf1d88d2677bc9e57905ec9abd56154a192d8b","last_reissued_at":"2026-05-18T00:37:34.211604Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:37:34.211604Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Birefringent light propagation on anisotropic cosmological backgrounds","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Felipe A. Asenjo, Sergio A. Hojman","submitted_at":"2017-03-07T20:23:13Z","abstract_excerpt":"Exact electromagnetic wave solutions to Maxwell equations on anisotropic Bianchi I cosmological spacetime backgrounds are studied. The waves evolving on Bianchi I spacetimes exhibit birefringence (associated to linear polarization) and dispersion.\n  The particular case of a vacuum--dominated anisotropic Universe, which reproduces a Friedmann-Robertson-Walker Universe (for late times) while for earlier times it matches a Kasner Universe, is studied. The electromagnetic waves do not, in general, follow null geodesics. This produces a modification of the cosmological redshift, which is now depend"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.02579","kind":"arxiv","version":3},"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":"1703.02579","created_at":"2026-05-18T00:37:34.211668+00:00"},{"alias_kind":"arxiv_version","alias_value":"1703.02579v3","created_at":"2026-05-18T00:37:34.211668+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.02579","created_at":"2026-05-18T00:37:34.211668+00:00"},{"alias_kind":"pith_short_12","alias_value":"5RBVH6BGJBFN","created_at":"2026-05-18T12:31:00.734936+00:00"},{"alias_kind":"pith_short_16","alias_value":"5RBVH6BGJBFNFLO5","created_at":"2026-05-18T12:31:00.734936+00:00"},{"alias_kind":"pith_short_8","alias_value":"5RBVH6BG","created_at":"2026-05-18T12:31:00.734936+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/5RBVH6BGJBFNFLO5MCPVZPY5RD","json":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD.json","graph_json":"https://pith.science/api/pith-number/5RBVH6BGJBFNFLO5MCPVZPY5RD/graph.json","events_json":"https://pith.science/api/pith-number/5RBVH6BGJBFNFLO5MCPVZPY5RD/events.json","paper":"https://pith.science/paper/5RBVH6BG"},"agent_actions":{"view_html":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD","download_json":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD.json","view_paper":"https://pith.science/paper/5RBVH6BG","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1703.02579&json=true","fetch_graph":"https://pith.science/api/pith-number/5RBVH6BGJBFNFLO5MCPVZPY5RD/graph.json","fetch_events":"https://pith.science/api/pith-number/5RBVH6BGJBFNFLO5MCPVZPY5RD/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/action/timestamp_anchor","attest_storage":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/action/storage_attestation","attest_author":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/action/author_attestation","sign_citation":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/action/citation_signature","submit_replication":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/action/replication_record"}},"created_at":"2026-05-18T00:37:34.211668+00:00","updated_at":"2026-05-18T00:37:34.211668+00:00"}