{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:W6VZNIA2ED3BWZUNVVV6K2DQY7","short_pith_number":"pith:W6VZNIA2","canonical_record":{"source":{"id":"1601.06816","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-01-25T21:29:39Z","cross_cats_sorted":["physics.optics","quant-ph"],"title_canon_sha256":"086799579e344c6bcf4e073cf892336dbb931ffb84e8bb51a977ff13365ac801","abstract_canon_sha256":"de6a24ac70e939d65bdeca05f129ed01479c02e67075cc4579d3f368e8d3136c"},"schema_version":"1.0"},"canonical_sha256":"b7ab96a01a20f61b668dad6be56870c7eb0dcef04278b0b0f64adbcc726b67a2","source":{"kind":"arxiv","id":"1601.06816","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.06816","created_at":"2026-05-18T01:12:49Z"},{"alias_kind":"arxiv_version","alias_value":"1601.06816v4","created_at":"2026-05-18T01:12:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.06816","created_at":"2026-05-18T01:12:49Z"},{"alias_kind":"pith_short_12","alias_value":"W6VZNIA2ED3B","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"W6VZNIA2ED3BWZUN","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"W6VZNIA2","created_at":"2026-05-18T12:30:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:W6VZNIA2ED3BWZUNVVV6K2DQY7","target":"record","payload":{"canonical_record":{"source":{"id":"1601.06816","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-01-25T21:29:39Z","cross_cats_sorted":["physics.optics","quant-ph"],"title_canon_sha256":"086799579e344c6bcf4e073cf892336dbb931ffb84e8bb51a977ff13365ac801","abstract_canon_sha256":"de6a24ac70e939d65bdeca05f129ed01479c02e67075cc4579d3f368e8d3136c"},"schema_version":"1.0"},"canonical_sha256":"b7ab96a01a20f61b668dad6be56870c7eb0dcef04278b0b0f64adbcc726b67a2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:12:49.099631Z","signature_b64":"WPiq8Fs5UF/yv9+ip4Ee+HSj49IgjVv9SFOJUObYvCQADnK6KgqQXgy7fE2B1OMp3x6h1uRXQ3Qz+5ISYqV3AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b7ab96a01a20f61b668dad6be56870c7eb0dcef04278b0b0f64adbcc726b67a2","last_reissued_at":"2026-05-18T01:12:49.099291Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:12:49.099291Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.06816","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:12:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5TXt1/T/RhWv4IqHfOAH1VEkD+zmFx5Pv6L/ohVNsKwye/F37WRjqVOgpoHwwALvm2sskkgUvV4dkvGANHSjDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T07:37:36.961528Z"},"content_sha256":"60aa828f9bc277d3ba061e99e9e65c9c3c2708dbb40da17a0f24c01ca0c5f108","schema_version":"1.0","event_id":"sha256:60aa828f9bc277d3ba061e99e9e65c9c3c2708dbb40da17a0f24c01ca0c5f108"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:W6VZNIA2ED3BWZUNVVV6K2DQY7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hawking spectrum for a fiber-optical analog of the event horizon","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.optics","quant-ph"],"primary_cat":"gr-qc","authors_text":"David Bermudez, Ulf Leonhardt","submitted_at":"2016-01-25T21:29:39Z","abstract_excerpt":"Hawking radiation has been regarded as a more general phenomenon than in gravitational physics, in particular in laboratory analogs of the event horizon. Here we consider the fiber-optical analog of the event horizon, where intense light pulses in fibers establish horizons for probe light. Then, we calculate the Hawking spectrum in an experimentally realizable system. We found that the Hawking radiation is peaked around group-velocity horizons in which the speed of the pulse matches the group velocity of the probe light. The radiation nearly vanishes at the phase horizon where the speed of the"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.06816","kind":"arxiv","version":4},"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":"2026-05-18T01:12:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GOk560OnCo52ozRS8j7FvLZGJtAeFzqFVpWyfa447G7skfx3WzJRvx5+I0vDoOJJqfXbFBpX7/eH7RWdxK6VCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T07:37:36.962202Z"},"content_sha256":"f1a3f23cc265c53ae4e4db5ebb10482826f6ef6ea6a06184e645f5be6c4c7ab8","schema_version":"1.0","event_id":"sha256:f1a3f23cc265c53ae4e4db5ebb10482826f6ef6ea6a06184e645f5be6c4c7ab8"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W6VZNIA2ED3BWZUNVVV6K2DQY7/bundle.json","state_url":"https://pith.science/pith/W6VZNIA2ED3BWZUNVVV6K2DQY7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W6VZNIA2ED3BWZUNVVV6K2DQY7/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":"2026-05-27T07:37:36Z","links":{"resolver":"https://pith.science/pith/W6VZNIA2ED3BWZUNVVV6K2DQY7","bundle":"https://pith.science/pith/W6VZNIA2ED3BWZUNVVV6K2DQY7/bundle.json","state":"https://pith.science/pith/W6VZNIA2ED3BWZUNVVV6K2DQY7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W6VZNIA2ED3BWZUNVVV6K2DQY7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:W6VZNIA2ED3BWZUNVVV6K2DQY7","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":"de6a24ac70e939d65bdeca05f129ed01479c02e67075cc4579d3f368e8d3136c","cross_cats_sorted":["physics.optics","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-01-25T21:29:39Z","title_canon_sha256":"086799579e344c6bcf4e073cf892336dbb931ffb84e8bb51a977ff13365ac801"},"schema_version":"1.0","source":{"id":"1601.06816","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.06816","created_at":"2026-05-18T01:12:49Z"},{"alias_kind":"arxiv_version","alias_value":"1601.06816v4","created_at":"2026-05-18T01:12:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.06816","created_at":"2026-05-18T01:12:49Z"},{"alias_kind":"pith_short_12","alias_value":"W6VZNIA2ED3B","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_16","alias_value":"W6VZNIA2ED3BWZUN","created_at":"2026-05-18T12:30:48Z"},{"alias_kind":"pith_short_8","alias_value":"W6VZNIA2","created_at":"2026-05-18T12:30:48Z"}],"graph_snapshots":[{"event_id":"sha256:f1a3f23cc265c53ae4e4db5ebb10482826f6ef6ea6a06184e645f5be6c4c7ab8","target":"graph","created_at":"2026-05-18T01:12:49Z","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":"Hawking radiation has been regarded as a more general phenomenon than in gravitational physics, in particular in laboratory analogs of the event horizon. Here we consider the fiber-optical analog of the event horizon, where intense light pulses in fibers establish horizons for probe light. Then, we calculate the Hawking spectrum in an experimentally realizable system. We found that the Hawking radiation is peaked around group-velocity horizons in which the speed of the pulse matches the group velocity of the probe light. The radiation nearly vanishes at the phase horizon where the speed of the","authors_text":"David Bermudez, Ulf Leonhardt","cross_cats":["physics.optics","quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-01-25T21:29:39Z","title":"Hawking spectrum for a fiber-optical analog of the event horizon"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.06816","kind":"arxiv","version":4},"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":"sha256:60aa828f9bc277d3ba061e99e9e65c9c3c2708dbb40da17a0f24c01ca0c5f108","target":"record","created_at":"2026-05-18T01:12:49Z","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":"de6a24ac70e939d65bdeca05f129ed01479c02e67075cc4579d3f368e8d3136c","cross_cats_sorted":["physics.optics","quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-01-25T21:29:39Z","title_canon_sha256":"086799579e344c6bcf4e073cf892336dbb931ffb84e8bb51a977ff13365ac801"},"schema_version":"1.0","source":{"id":"1601.06816","kind":"arxiv","version":4}},"canonical_sha256":"b7ab96a01a20f61b668dad6be56870c7eb0dcef04278b0b0f64adbcc726b67a2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b7ab96a01a20f61b668dad6be56870c7eb0dcef04278b0b0f64adbcc726b67a2","first_computed_at":"2026-05-18T01:12:49.099291Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:12:49.099291Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WPiq8Fs5UF/yv9+ip4Ee+HSj49IgjVv9SFOJUObYvCQADnK6KgqQXgy7fE2B1OMp3x6h1uRXQ3Qz+5ISYqV3AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:12:49.099631Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.06816","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:60aa828f9bc277d3ba061e99e9e65c9c3c2708dbb40da17a0f24c01ca0c5f108","sha256:f1a3f23cc265c53ae4e4db5ebb10482826f6ef6ea6a06184e645f5be6c4c7ab8"],"state_sha256":"e7c2d3f4c6e8851a364aec000bcca5420bc82a6c476e97bd014a819388c9e31e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HAAYlNz0x3ZXtAScmr0+bzGXNNuE4IPrggdsbcAEuJgER+hI8O5wt02K5zeu+u0cUnn1pszYdij/Yn7n4sxQAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T07:37:36.967088Z","bundle_sha256":"86582820ffe7a07631a4855e03230d18fc227a28374f50d54ba8724ab52f8d33"}}