{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:5RBVH6BGJBFNFLO5MCPVZPY5RD","short_pith_number":"pith:5RBVH6BG","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"},"canonical_sha256":"ec4353f826484ad2addd609f5cbf1d88d2677bc9e57905ec9abd56154a192d8b","source":{"kind":"arxiv","id":"1703.02579","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.02579","created_at":"2026-05-18T00:37:34Z"},{"alias_kind":"arxiv_version","alias_value":"1703.02579v3","created_at":"2026-05-18T00:37:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.02579","created_at":"2026-05-18T00:37:34Z"},{"alias_kind":"pith_short_12","alias_value":"5RBVH6BGJBFN","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"5RBVH6BGJBFNFLO5","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"5RBVH6BG","created_at":"2026-05-18T12:31:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:5RBVH6BGJBFNFLO5MCPVZPY5RD","target":"record","payload":{"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"},"canonical_sha256":"ec4353f826484ad2addd609f5cbf1d88d2677bc9e57905ec9abd56154a192d8b","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"},"source_kind":"arxiv","source_id":"1703.02579","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:37:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"262lWK4pdLAvnlApWMxBmwVEinkI6Y1Ux/qjzSyp8XFOjW6sUpd3c3Lqcrw9Wd+zb768RpDyaXl5pSJAjbguAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T00:22:00.641575Z"},"content_sha256":"12d46567db2ef0e0ebf85edab3295401fbf34e46ee965f494c76d2118965df2b","schema_version":"1.0","event_id":"sha256:12d46567db2ef0e0ebf85edab3295401fbf34e46ee965f494c76d2118965df2b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:5RBVH6BGJBFNFLO5MCPVZPY5RD","target":"graph","payload":{"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:37:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oIV0WdLX4VHe2IXa8O3ING0RbiJwkgdsQvgA4OQ5ZIDQFBfZIHCup71uNnQ+zNebZrX4NkdQH0NuhoBkbEy5Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T00:22:00.641922Z"},"content_sha256":"3c57d041f6fc6c76efe1fb5ad4ec8071a529b10daa1659c0b12f1c341eec4588","schema_version":"1.0","event_id":"sha256:3c57d041f6fc6c76efe1fb5ad4ec8071a529b10daa1659c0b12f1c341eec4588"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/bundle.json","state_url":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-03T00:22:00Z","links":{"resolver":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD","bundle":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/bundle.json","state":"https://pith.science/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5RBVH6BGJBFNFLO5MCPVZPY5RD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:5RBVH6BGJBFNFLO5MCPVZPY5RD","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"bb7c1ebcbbdcdb96db7c4402289f287aaeeb2f7158edb4344f5e46dfa6535e1b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-03-07T20:23:13Z","title_canon_sha256":"0dbd2359621d475c6850896da42fc962b135cbc9ca6d78dec200a15d0caa5d51"},"schema_version":"1.0","source":{"id":"1703.02579","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1703.02579","created_at":"2026-05-18T00:37:34Z"},{"alias_kind":"arxiv_version","alias_value":"1703.02579v3","created_at":"2026-05-18T00:37:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1703.02579","created_at":"2026-05-18T00:37:34Z"},{"alias_kind":"pith_short_12","alias_value":"5RBVH6BGJBFN","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_16","alias_value":"5RBVH6BGJBFNFLO5","created_at":"2026-05-18T12:31:00Z"},{"alias_kind":"pith_short_8","alias_value":"5RBVH6BG","created_at":"2026-05-18T12:31:00Z"}],"graph_snapshots":[{"event_id":"sha256:3c57d041f6fc6c76efe1fb5ad4ec8071a529b10daa1659c0b12f1c341eec4588","target":"graph","created_at":"2026-05-18T00:37:34Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"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","authors_text":"Felipe A. Asenjo, Sergio A. Hojman","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-03-07T20:23:13Z","title":"Birefringent light propagation on anisotropic cosmological backgrounds"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1703.02579","kind":"arxiv","version":3},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:12d46567db2ef0e0ebf85edab3295401fbf34e46ee965f494c76d2118965df2b","target":"record","created_at":"2026-05-18T00:37:34Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"bb7c1ebcbbdcdb96db7c4402289f287aaeeb2f7158edb4344f5e46dfa6535e1b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-03-07T20:23:13Z","title_canon_sha256":"0dbd2359621d475c6850896da42fc962b135cbc9ca6d78dec200a15d0caa5d51"},"schema_version":"1.0","source":{"id":"1703.02579","kind":"arxiv","version":3}},"canonical_sha256":"ec4353f826484ad2addd609f5cbf1d88d2677bc9e57905ec9abd56154a192d8b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ec4353f826484ad2addd609f5cbf1d88d2677bc9e57905ec9abd56154a192d8b","first_computed_at":"2026-05-18T00:37:34.211604Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:37:34.211604Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Jcc8AzjRTWUM9VMQnnfTcbqxXSf5lhqCr8/2ivESf4vCsH234vPSmawpDIy+HuY/gMvcfMiuceCt18rzzEP0CA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:37:34.212013Z","signed_message":"canonical_sha256_bytes"},"source_id":"1703.02579","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:12d46567db2ef0e0ebf85edab3295401fbf34e46ee965f494c76d2118965df2b","sha256:3c57d041f6fc6c76efe1fb5ad4ec8071a529b10daa1659c0b12f1c341eec4588"],"state_sha256":"a03c1287bd32172076f346af777bee8398d061930cf0ef241a274b54854c6952"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1SHu1K7glxQQwnzpb3wE5JheOVPUKQpKNicFgRCSEqhDWmAROY2UD8bxMFShZUETuowMAF2Hq47BGpJiSG/7Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T00:22:00.643863Z","bundle_sha256":"bf4ca9f664f19dca0abcb5e0608d9a537eb930a00d59fc6864c14030d13ec0c2"}}