{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:YMCTCDTOTTC5MAXMV7RDMYV7AM","short_pith_number":"pith:YMCTCDTO","canonical_record":{"source":{"id":"1401.7544","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-01-28T09:50:37Z","cross_cats_sorted":[],"title_canon_sha256":"a72625d9dda504b33cb8597448b8308619518af671f944defd6893919f7e3123","abstract_canon_sha256":"16c387f09543a029afacfebcfbce00b8b44157b1c9bd3782cf4f5e8e945e9985"},"schema_version":"1.0"},"canonical_sha256":"c305310e6e9cc5d602ecafe23662bf0311491b88a117d37848205a58606c329b","source":{"kind":"arxiv","id":"1401.7544","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.7544","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"arxiv_version","alias_value":"1401.7544v1","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.7544","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"pith_short_12","alias_value":"YMCTCDTOTTC5","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"YMCTCDTOTTC5MAXM","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"YMCTCDTO","created_at":"2026-05-18T12:28:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:YMCTCDTOTTC5MAXMV7RDMYV7AM","target":"record","payload":{"canonical_record":{"source":{"id":"1401.7544","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-01-28T09:50:37Z","cross_cats_sorted":[],"title_canon_sha256":"a72625d9dda504b33cb8597448b8308619518af671f944defd6893919f7e3123","abstract_canon_sha256":"16c387f09543a029afacfebcfbce00b8b44157b1c9bd3782cf4f5e8e945e9985"},"schema_version":"1.0"},"canonical_sha256":"c305310e6e9cc5d602ecafe23662bf0311491b88a117d37848205a58606c329b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:27:05.626743Z","signature_b64":"TpUHrVwo7ME+KtdQXiGNG2rVTCu3My+7mxtIr3+ymzbOx71h9gXUmcfhF1yP90Tg7n0gZlWXDIwVQ4pIJhWzBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c305310e6e9cc5d602ecafe23662bf0311491b88a117d37848205a58606c329b","last_reissued_at":"2026-05-18T02:27:05.626337Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:27:05.626337Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1401.7544","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:27:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tzMEZPxi48Wb686hgLflIlxkxloipOD7V2CtoTM3W/hed1YPjIc63yz5pX4w59RoN3mKGHtaii6lE/bAfWI9AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T15:59:33.055057Z"},"content_sha256":"846c92efc0fd33538f8f97cfa90adc3ac3660bd27acadad80e85b0a82965d3d9","schema_version":"1.0","event_id":"sha256:846c92efc0fd33538f8f97cfa90adc3ac3660bd27acadad80e85b0a82965d3d9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:YMCTCDTOTTC5MAXMV7RDMYV7AM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Analogue black holes for light rays in static dielectrics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"E. Bittencourt, J. M. Salim, M. Novello, R. Klippert, V. A. De Lorenci","submitted_at":"2014-01-28T09:50:37Z","abstract_excerpt":"Propagation of light in nonlinear materials is here studied in the regime of the geometrical optics. It is shown that a spherically symmetric medium at rest with some specific dielectric properties can be used to produce an exact analogue model for a class of space-times which includes spherically symmetric and static black hole solutions. The optical model here presented can be a useful tool to reproduce in laboratory the behavior of optical null geodesics near a compact object with an observable gravitational Schwarzschild radius."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.7544","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:27:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RJY4ymCrjdDQXovucg5gdGjmMVne/nvEZAuHScFAO6e4B6s77/H6LZW2jKCWxSuQX0b9BTlJp9txdnAjFydmDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T15:59:33.055778Z"},"content_sha256":"575e993077075d69f52d4d1efc69dc9833f70426ea96fd84959b8bb88b25c177","schema_version":"1.0","event_id":"sha256:575e993077075d69f52d4d1efc69dc9833f70426ea96fd84959b8bb88b25c177"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YMCTCDTOTTC5MAXMV7RDMYV7AM/bundle.json","state_url":"https://pith.science/pith/YMCTCDTOTTC5MAXMV7RDMYV7AM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YMCTCDTOTTC5MAXMV7RDMYV7AM/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":"2026-06-06T15:59:33Z","links":{"resolver":"https://pith.science/pith/YMCTCDTOTTC5MAXMV7RDMYV7AM","bundle":"https://pith.science/pith/YMCTCDTOTTC5MAXMV7RDMYV7AM/bundle.json","state":"https://pith.science/pith/YMCTCDTOTTC5MAXMV7RDMYV7AM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YMCTCDTOTTC5MAXMV7RDMYV7AM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:YMCTCDTOTTC5MAXMV7RDMYV7AM","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":"16c387f09543a029afacfebcfbce00b8b44157b1c9bd3782cf4f5e8e945e9985","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-01-28T09:50:37Z","title_canon_sha256":"a72625d9dda504b33cb8597448b8308619518af671f944defd6893919f7e3123"},"schema_version":"1.0","source":{"id":"1401.7544","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1401.7544","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"arxiv_version","alias_value":"1401.7544v1","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1401.7544","created_at":"2026-05-18T02:27:05Z"},{"alias_kind":"pith_short_12","alias_value":"YMCTCDTOTTC5","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_16","alias_value":"YMCTCDTOTTC5MAXM","created_at":"2026-05-18T12:28:57Z"},{"alias_kind":"pith_short_8","alias_value":"YMCTCDTO","created_at":"2026-05-18T12:28:57Z"}],"graph_snapshots":[{"event_id":"sha256:575e993077075d69f52d4d1efc69dc9833f70426ea96fd84959b8bb88b25c177","target":"graph","created_at":"2026-05-18T02:27:05Z","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":"Propagation of light in nonlinear materials is here studied in the regime of the geometrical optics. It is shown that a spherically symmetric medium at rest with some specific dielectric properties can be used to produce an exact analogue model for a class of space-times which includes spherically symmetric and static black hole solutions. The optical model here presented can be a useful tool to reproduce in laboratory the behavior of optical null geodesics near a compact object with an observable gravitational Schwarzschild radius.","authors_text":"E. Bittencourt, J. M. Salim, M. Novello, R. Klippert, V. A. De Lorenci","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-01-28T09:50:37Z","title":"Analogue black holes for light rays in static dielectrics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1401.7544","kind":"arxiv","version":1},"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":"sha256:846c92efc0fd33538f8f97cfa90adc3ac3660bd27acadad80e85b0a82965d3d9","target":"record","created_at":"2026-05-18T02:27:05Z","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":"16c387f09543a029afacfebcfbce00b8b44157b1c9bd3782cf4f5e8e945e9985","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2014-01-28T09:50:37Z","title_canon_sha256":"a72625d9dda504b33cb8597448b8308619518af671f944defd6893919f7e3123"},"schema_version":"1.0","source":{"id":"1401.7544","kind":"arxiv","version":1}},"canonical_sha256":"c305310e6e9cc5d602ecafe23662bf0311491b88a117d37848205a58606c329b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c305310e6e9cc5d602ecafe23662bf0311491b88a117d37848205a58606c329b","first_computed_at":"2026-05-18T02:27:05.626337Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:27:05.626337Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TpUHrVwo7ME+KtdQXiGNG2rVTCu3My+7mxtIr3+ymzbOx71h9gXUmcfhF1yP90Tg7n0gZlWXDIwVQ4pIJhWzBw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:27:05.626743Z","signed_message":"canonical_sha256_bytes"},"source_id":"1401.7544","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:846c92efc0fd33538f8f97cfa90adc3ac3660bd27acadad80e85b0a82965d3d9","sha256:575e993077075d69f52d4d1efc69dc9833f70426ea96fd84959b8bb88b25c177"],"state_sha256":"5e14622ad2086ee60e103767be100a0a1bb51b4d989363698fb4931e30c988ac"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cNhmpD8/FWlCaMbPtx5FWAteGkjOzvjUiVhhuLYZPPUYxZQlaej66GDzzHoSJv9a7O7eagCo0TWXUpq1ZFzQAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T15:59:33.059126Z","bundle_sha256":"84bec8a5b70d537442649dea17d2442f61c32323f2b8586092498e135978ba71"}}