{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:WTBGMNOO3YR7SICQR5ONVKCPSJ","short_pith_number":"pith:WTBGMNOO","canonical_record":{"source":{"id":"1904.06315","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-04-12T16:46:05Z","cross_cats_sorted":["cond-mat.mtrl-sci","physics.app-ph"],"title_canon_sha256":"d0d1d2e2ea616a8401ed39c9f116f071e03edcf09eaa348d33d0a33358862218","abstract_canon_sha256":"c9968b63125c268ab52e2c5065a2d51b11788b60be4a38ea3eba89cbbb85c8f6"},"schema_version":"1.0"},"canonical_sha256":"b4c26635cede23f920508f5cdaa84f9273484ba11cfefac927c24bd1de7607c4","source":{"kind":"arxiv","id":"1904.06315","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.06315","created_at":"2026-05-17T23:48:43Z"},{"alias_kind":"arxiv_version","alias_value":"1904.06315v1","created_at":"2026-05-17T23:48:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.06315","created_at":"2026-05-17T23:48:43Z"},{"alias_kind":"pith_short_12","alias_value":"WTBGMNOO3YR7","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"WTBGMNOO3YR7SICQ","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"WTBGMNOO","created_at":"2026-05-18T12:33:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:WTBGMNOO3YR7SICQR5ONVKCPSJ","target":"record","payload":{"canonical_record":{"source":{"id":"1904.06315","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-04-12T16:46:05Z","cross_cats_sorted":["cond-mat.mtrl-sci","physics.app-ph"],"title_canon_sha256":"d0d1d2e2ea616a8401ed39c9f116f071e03edcf09eaa348d33d0a33358862218","abstract_canon_sha256":"c9968b63125c268ab52e2c5065a2d51b11788b60be4a38ea3eba89cbbb85c8f6"},"schema_version":"1.0"},"canonical_sha256":"b4c26635cede23f920508f5cdaa84f9273484ba11cfefac927c24bd1de7607c4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:48:43.610474Z","signature_b64":"c0wjOoMgCUd3euO4emB9IB8YnnbHPsHuTbvMWq7NKSTMX6p1UPPfJVQGG9b6U2otRYw8ra4tnQTEbVvsdxX+Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b4c26635cede23f920508f5cdaa84f9273484ba11cfefac927c24bd1de7607c4","last_reissued_at":"2026-05-17T23:48:43.610023Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:48:43.610023Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1904.06315","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":"2026-05-17T23:48:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+8kvCWaackd5FA6lreeiLIPcOBY3l3JSbGXVsqjMDvxkRO/bFLeqAmKJqND29dZCxJfgfZUlQcCSj02nLy5hAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T11:11:16.880521Z"},"content_sha256":"8d53e4a35d0d691100b95ef943943072d06ac35ec1a3fe6b852ae6ca42489bf2","schema_version":"1.0","event_id":"sha256:8d53e4a35d0d691100b95ef943943072d06ac35ec1a3fe6b852ae6ca42489bf2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:WTBGMNOO3YR7SICQR5ONVKCPSJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Acoustic cloaking: geometric transform, homogenization and a genetic algorithm","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.mtrl-sci","physics.app-ph"],"primary_cat":"physics.comp-ph","authors_text":"C\\'edric Payan, Lucas Pomot, Marcel Remillieux, S\\'ebastien Guenneau","submitted_at":"2019-04-12T16:46:05Z","abstract_excerpt":"A general process is proposed to experimentally design anisotropic inhomogeneous metamaterials obtained through a change of coordinate in the Helmholtz equation. The method is applied to the case of a cylindrical transformation that allows to perform cloaking. To approximate such complex metamaterials we apply results of the theory of homogenization and combine them with a genetic algorithm. To illustrate the power of our approach, we design three types of cloaks composed of isotropic concentric layers structured with three types of perforations: curved rectangles, split rings and crosses. The"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.06315","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":"2026-05-17T23:48:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FQPbf4GfKvmeGqvru5ja/uJWDjnakOKKn7/VCxqOkVZrb2ssDusN/5z+j5VJcEwqHaRBS9tjGisBvugb0ZPLBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T11:11:16.880864Z"},"content_sha256":"1d848d1d0ca7a9de9feb618f4aebafb0506c220cbc21c231d3fc956351a9b253","schema_version":"1.0","event_id":"sha256:1d848d1d0ca7a9de9feb618f4aebafb0506c220cbc21c231d3fc956351a9b253"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WTBGMNOO3YR7SICQR5ONVKCPSJ/bundle.json","state_url":"https://pith.science/pith/WTBGMNOO3YR7SICQR5ONVKCPSJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WTBGMNOO3YR7SICQR5ONVKCPSJ/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":"2026-06-02T11:11:16Z","links":{"resolver":"https://pith.science/pith/WTBGMNOO3YR7SICQR5ONVKCPSJ","bundle":"https://pith.science/pith/WTBGMNOO3YR7SICQR5ONVKCPSJ/bundle.json","state":"https://pith.science/pith/WTBGMNOO3YR7SICQR5ONVKCPSJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WTBGMNOO3YR7SICQR5ONVKCPSJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:WTBGMNOO3YR7SICQR5ONVKCPSJ","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":"c9968b63125c268ab52e2c5065a2d51b11788b60be4a38ea3eba89cbbb85c8f6","cross_cats_sorted":["cond-mat.mtrl-sci","physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-04-12T16:46:05Z","title_canon_sha256":"d0d1d2e2ea616a8401ed39c9f116f071e03edcf09eaa348d33d0a33358862218"},"schema_version":"1.0","source":{"id":"1904.06315","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1904.06315","created_at":"2026-05-17T23:48:43Z"},{"alias_kind":"arxiv_version","alias_value":"1904.06315v1","created_at":"2026-05-17T23:48:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1904.06315","created_at":"2026-05-17T23:48:43Z"},{"alias_kind":"pith_short_12","alias_value":"WTBGMNOO3YR7","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"WTBGMNOO3YR7SICQ","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"WTBGMNOO","created_at":"2026-05-18T12:33:30Z"}],"graph_snapshots":[{"event_id":"sha256:1d848d1d0ca7a9de9feb618f4aebafb0506c220cbc21c231d3fc956351a9b253","target":"graph","created_at":"2026-05-17T23:48:43Z","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":"A general process is proposed to experimentally design anisotropic inhomogeneous metamaterials obtained through a change of coordinate in the Helmholtz equation. The method is applied to the case of a cylindrical transformation that allows to perform cloaking. To approximate such complex metamaterials we apply results of the theory of homogenization and combine them with a genetic algorithm. To illustrate the power of our approach, we design three types of cloaks composed of isotropic concentric layers structured with three types of perforations: curved rectangles, split rings and crosses. The","authors_text":"C\\'edric Payan, Lucas Pomot, Marcel Remillieux, S\\'ebastien Guenneau","cross_cats":["cond-mat.mtrl-sci","physics.app-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-04-12T16:46:05Z","title":"Acoustic cloaking: geometric transform, homogenization and a genetic algorithm"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1904.06315","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":"sha256:8d53e4a35d0d691100b95ef943943072d06ac35ec1a3fe6b852ae6ca42489bf2","target":"record","created_at":"2026-05-17T23:48:43Z","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":"c9968b63125c268ab52e2c5065a2d51b11788b60be4a38ea3eba89cbbb85c8f6","cross_cats_sorted":["cond-mat.mtrl-sci","physics.app-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2019-04-12T16:46:05Z","title_canon_sha256":"d0d1d2e2ea616a8401ed39c9f116f071e03edcf09eaa348d33d0a33358862218"},"schema_version":"1.0","source":{"id":"1904.06315","kind":"arxiv","version":1}},"canonical_sha256":"b4c26635cede23f920508f5cdaa84f9273484ba11cfefac927c24bd1de7607c4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b4c26635cede23f920508f5cdaa84f9273484ba11cfefac927c24bd1de7607c4","first_computed_at":"2026-05-17T23:48:43.610023Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:48:43.610023Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"c0wjOoMgCUd3euO4emB9IB8YnnbHPsHuTbvMWq7NKSTMX6p1UPPfJVQGG9b6U2otRYw8ra4tnQTEbVvsdxX+Cw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:48:43.610474Z","signed_message":"canonical_sha256_bytes"},"source_id":"1904.06315","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8d53e4a35d0d691100b95ef943943072d06ac35ec1a3fe6b852ae6ca42489bf2","sha256:1d848d1d0ca7a9de9feb618f4aebafb0506c220cbc21c231d3fc956351a9b253"],"state_sha256":"5a2a9e08fa8af6f764f67e27437b69a6c714ae21d1a415a8cba8351e8e63236e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"68ibjQe15bhDBmbNhXMWGTx2VuWOEo36pzOR+AisCZHI8AS7x+RCY0ZOq7re0tDRVqsEldisMS3OmHyiapzRAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T11:11:16.882845Z","bundle_sha256":"3bbacb8d8124b06aa49e5415b818fceb5548c5189f9204e74a76d4c0d7f5798d"}}