{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:ASPYGTUSSH5JBGN6DO5YDTVZ4G","short_pith_number":"pith:ASPYGTUS","canonical_record":{"source":{"id":"1209.5627","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-25T14:44:56Z","cross_cats_sorted":[],"title_canon_sha256":"0b6610cb03a2070e143531277fcecef16fdb54cfac0b1354162fe011ed696751","abstract_canon_sha256":"26f683852bfcc1804d89b84b921f11debc8a6937419534f718dcfec6e75d29eb"},"schema_version":"1.0"},"canonical_sha256":"049f834e9291fa9099be1bbb81ceb9e1b67cc2051914b8ecb08d956f0afc9b02","source":{"kind":"arxiv","id":"1209.5627","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.5627","created_at":"2026-05-18T01:54:19Z"},{"alias_kind":"arxiv_version","alias_value":"1209.5627v1","created_at":"2026-05-18T01:54:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.5627","created_at":"2026-05-18T01:54:19Z"},{"alias_kind":"pith_short_12","alias_value":"ASPYGTUSSH5J","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"ASPYGTUSSH5JBGN6","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"ASPYGTUS","created_at":"2026-05-18T12:26:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:ASPYGTUSSH5JBGN6DO5YDTVZ4G","target":"record","payload":{"canonical_record":{"source":{"id":"1209.5627","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-25T14:44:56Z","cross_cats_sorted":[],"title_canon_sha256":"0b6610cb03a2070e143531277fcecef16fdb54cfac0b1354162fe011ed696751","abstract_canon_sha256":"26f683852bfcc1804d89b84b921f11debc8a6937419534f718dcfec6e75d29eb"},"schema_version":"1.0"},"canonical_sha256":"049f834e9291fa9099be1bbb81ceb9e1b67cc2051914b8ecb08d956f0afc9b02","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:54:19.009566Z","signature_b64":"X75+iP0O9kJ7waD248oAicWG00ggBxdvWFpbEdL7qDgWc33e4kvugCGgL2EztZZD7uwHo2iBd0HFQiW6RJW6Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"049f834e9291fa9099be1bbb81ceb9e1b67cc2051914b8ecb08d956f0afc9b02","last_reissued_at":"2026-05-18T01:54:19.009046Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:54:19.009046Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1209.5627","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":"2026-05-18T01:54:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z4nFzLyimCYcVypYEEPiDZcjl/F9G3KlNn8VfAdFH9SX6M/xV70naDZfKWDnmDn722SyB09zTiD6PqgslrC+Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T23:38:30.374590Z"},"content_sha256":"9865b77d60dba6552095336e9636203fba52394c364dc68de81bc3a318579b3f","schema_version":"1.0","event_id":"sha256:9865b77d60dba6552095336e9636203fba52394c364dc68de81bc3a318579b3f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:ASPYGTUSSH5JBGN6DO5YDTVZ4G","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Low-loss directional cloaks without superluminal velocity or magnetic response","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.optics","authors_text":"David R. Smith, Yaroslav Urzhumov","submitted_at":"2012-09-25T14:44:56Z","abstract_excerpt":"The possibility of making an optically large (many wavelengths in diameter) object appear invisible has been a subject of many recent studies. Exact invisibility scenarios for large (relative to the wavelength) objects involve (meta)materials with superluminal phase velocity (refractive index less than unity) and/or magnetic response. We introduce a new approximation applicable to certain device geometries in the eikonal limit: piecewise-uniform scaling of the refractive index. This transformation preserves the ray trajectories, but leads to a uniform phase delay. We show how to take advantage"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.5627","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":"2026-05-18T01:54:19Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OYvl4KeNwdKGQ1asjyQO6Ih/+qZvt8+opBzCqiTsp5KSkWksHWBFnJ1P7/qSHoVJiE2jPMYaoWG0STlX1HhjDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T23:38:30.374935Z"},"content_sha256":"3293d9eff5d40ba8cfba13e587d1f909ab000697d64210eae34813f265fa727f","schema_version":"1.0","event_id":"sha256:3293d9eff5d40ba8cfba13e587d1f909ab000697d64210eae34813f265fa727f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ASPYGTUSSH5JBGN6DO5YDTVZ4G/bundle.json","state_url":"https://pith.science/pith/ASPYGTUSSH5JBGN6DO5YDTVZ4G/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ASPYGTUSSH5JBGN6DO5YDTVZ4G/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":"2026-06-01T23:38:30Z","links":{"resolver":"https://pith.science/pith/ASPYGTUSSH5JBGN6DO5YDTVZ4G","bundle":"https://pith.science/pith/ASPYGTUSSH5JBGN6DO5YDTVZ4G/bundle.json","state":"https://pith.science/pith/ASPYGTUSSH5JBGN6DO5YDTVZ4G/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ASPYGTUSSH5JBGN6DO5YDTVZ4G/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:ASPYGTUSSH5JBGN6DO5YDTVZ4G","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":"26f683852bfcc1804d89b84b921f11debc8a6937419534f718dcfec6e75d29eb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-25T14:44:56Z","title_canon_sha256":"0b6610cb03a2070e143531277fcecef16fdb54cfac0b1354162fe011ed696751"},"schema_version":"1.0","source":{"id":"1209.5627","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1209.5627","created_at":"2026-05-18T01:54:19Z"},{"alias_kind":"arxiv_version","alias_value":"1209.5627v1","created_at":"2026-05-18T01:54:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1209.5627","created_at":"2026-05-18T01:54:19Z"},{"alias_kind":"pith_short_12","alias_value":"ASPYGTUSSH5J","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_16","alias_value":"ASPYGTUSSH5JBGN6","created_at":"2026-05-18T12:26:58Z"},{"alias_kind":"pith_short_8","alias_value":"ASPYGTUS","created_at":"2026-05-18T12:26:58Z"}],"graph_snapshots":[{"event_id":"sha256:3293d9eff5d40ba8cfba13e587d1f909ab000697d64210eae34813f265fa727f","target":"graph","created_at":"2026-05-18T01:54:19Z","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":"The possibility of making an optically large (many wavelengths in diameter) object appear invisible has been a subject of many recent studies. Exact invisibility scenarios for large (relative to the wavelength) objects involve (meta)materials with superluminal phase velocity (refractive index less than unity) and/or magnetic response. We introduce a new approximation applicable to certain device geometries in the eikonal limit: piecewise-uniform scaling of the refractive index. This transformation preserves the ray trajectories, but leads to a uniform phase delay. We show how to take advantage","authors_text":"David R. Smith, Yaroslav Urzhumov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-25T14:44:56Z","title":"Low-loss directional cloaks without superluminal velocity or magnetic response"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1209.5627","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":"sha256:9865b77d60dba6552095336e9636203fba52394c364dc68de81bc3a318579b3f","target":"record","created_at":"2026-05-18T01:54:19Z","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":"26f683852bfcc1804d89b84b921f11debc8a6937419534f718dcfec6e75d29eb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.optics","submitted_at":"2012-09-25T14:44:56Z","title_canon_sha256":"0b6610cb03a2070e143531277fcecef16fdb54cfac0b1354162fe011ed696751"},"schema_version":"1.0","source":{"id":"1209.5627","kind":"arxiv","version":1}},"canonical_sha256":"049f834e9291fa9099be1bbb81ceb9e1b67cc2051914b8ecb08d956f0afc9b02","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"049f834e9291fa9099be1bbb81ceb9e1b67cc2051914b8ecb08d956f0afc9b02","first_computed_at":"2026-05-18T01:54:19.009046Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:19.009046Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"X75+iP0O9kJ7waD248oAicWG00ggBxdvWFpbEdL7qDgWc33e4kvugCGgL2EztZZD7uwHo2iBd0HFQiW6RJW6Bw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:19.009566Z","signed_message":"canonical_sha256_bytes"},"source_id":"1209.5627","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9865b77d60dba6552095336e9636203fba52394c364dc68de81bc3a318579b3f","sha256:3293d9eff5d40ba8cfba13e587d1f909ab000697d64210eae34813f265fa727f"],"state_sha256":"7922d0d6df2aabc7089d4b9925922db6499340775bf213e148564d802cabeab9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aSrCOqmOL3+zgPHr29/kViFpDgDcf26lX4wAhHqNuymyTogMEThu7qRCX+MV42/xBogO4MXcpMl4i4H3rl74DQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T23:38:30.376864Z","bundle_sha256":"b79d35d920a83f127a4efc31e5880347e69b0619d44740e76fd0cf7e4dd24d4c"}}