{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:6PEU5T7DMU47YDNWLGOLJQMENI","short_pith_number":"pith:6PEU5T7D","schema_version":"1.0","canonical_sha256":"f3c94ecfe36539fc0db6599cb4c1846a0aac2f93d76c4834408296bc737fe676","source":{"kind":"arxiv","id":"1706.05470","version":2},"attestation_state":"computed","paper":{"title":"Cosmology in the laboratory: an analogy between hyperbolic metamaterials and the Milne universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft"],"primary_cat":"gr-qc","authors_text":"Bertrand Berche, David Figueiredo, Fernando Moraes, S\\'ebastien Fumeron","submitted_at":"2017-06-17T02:28:46Z","abstract_excerpt":"This article shows that the compactified Milne universe geometry, a toy model for the big crunch/big bang transition, can be realized in hyperbolic metamaterials, a new class of nanoengineered systems which have recently found its way as an experimental playground for cosmological ideas. On one side, Klein-Gordon particles, as well as tachyons, are used as probes of the Milne geometry. On the other side, the propagation of light in two versions of a liquid crystal-based metamaterial provides the analogy. It is shown that ray and wave optics in the metamaterial mimic, respectively, the classica"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1706.05470","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-06-17T02:28:46Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"9870229d199b4e2fed98031fde52c111d7b80ea2e8f0ed159570d0a395be3bce","abstract_canon_sha256":"aefcc27faa3a12479ba12f6e883e21af4ca80d8090f0c0bce7362c69f9db8f27"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:30:03.737800Z","signature_b64":"5Y/n7ZTPC/8PxkMtuYnFsSU5D0cTnMyTowl2ubdq34S6JDyIAvQcPfnxVDj2qL4jis4okYLPrd0I11ND+e+9Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f3c94ecfe36539fc0db6599cb4c1846a0aac2f93d76c4834408296bc737fe676","last_reissued_at":"2026-05-18T00:30:03.737423Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:30:03.737423Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Cosmology in the laboratory: an analogy between hyperbolic metamaterials and the Milne universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft"],"primary_cat":"gr-qc","authors_text":"Bertrand Berche, David Figueiredo, Fernando Moraes, S\\'ebastien Fumeron","submitted_at":"2017-06-17T02:28:46Z","abstract_excerpt":"This article shows that the compactified Milne universe geometry, a toy model for the big crunch/big bang transition, can be realized in hyperbolic metamaterials, a new class of nanoengineered systems which have recently found its way as an experimental playground for cosmological ideas. On one side, Klein-Gordon particles, as well as tachyons, are used as probes of the Milne geometry. On the other side, the propagation of light in two versions of a liquid crystal-based metamaterial provides the analogy. It is shown that ray and wave optics in the metamaterial mimic, respectively, the classica"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1706.05470","kind":"arxiv","version":2},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1706.05470","created_at":"2026-05-18T00:30:03.737484+00:00"},{"alias_kind":"arxiv_version","alias_value":"1706.05470v2","created_at":"2026-05-18T00:30:03.737484+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1706.05470","created_at":"2026-05-18T00:30:03.737484+00:00"},{"alias_kind":"pith_short_12","alias_value":"6PEU5T7DMU47","created_at":"2026-05-18T12:31:03.183658+00:00"},{"alias_kind":"pith_short_16","alias_value":"6PEU5T7DMU47YDNW","created_at":"2026-05-18T12:31:03.183658+00:00"},{"alias_kind":"pith_short_8","alias_value":"6PEU5T7D","created_at":"2026-05-18T12:31:03.183658+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/6PEU5T7DMU47YDNWLGOLJQMENI","json":"https://pith.science/pith/6PEU5T7DMU47YDNWLGOLJQMENI.json","graph_json":"https://pith.science/api/pith-number/6PEU5T7DMU47YDNWLGOLJQMENI/graph.json","events_json":"https://pith.science/api/pith-number/6PEU5T7DMU47YDNWLGOLJQMENI/events.json","paper":"https://pith.science/paper/6PEU5T7D"},"agent_actions":{"view_html":"https://pith.science/pith/6PEU5T7DMU47YDNWLGOLJQMENI","download_json":"https://pith.science/pith/6PEU5T7DMU47YDNWLGOLJQMENI.json","view_paper":"https://pith.science/paper/6PEU5T7D","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1706.05470&json=true","fetch_graph":"https://pith.science/api/pith-number/6PEU5T7DMU47YDNWLGOLJQMENI/graph.json","fetch_events":"https://pith.science/api/pith-number/6PEU5T7DMU47YDNWLGOLJQMENI/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/6PEU5T7DMU47YDNWLGOLJQMENI/action/timestamp_anchor","attest_storage":"https://pith.science/pith/6PEU5T7DMU47YDNWLGOLJQMENI/action/storage_attestation","attest_author":"https://pith.science/pith/6PEU5T7DMU47YDNWLGOLJQMENI/action/author_attestation","sign_citation":"https://pith.science/pith/6PEU5T7DMU47YDNWLGOLJQMENI/action/citation_signature","submit_replication":"https://pith.science/pith/6PEU5T7DMU47YDNWLGOLJQMENI/action/replication_record"}},"created_at":"2026-05-18T00:30:03.737484+00:00","updated_at":"2026-05-18T00:30:03.737484+00:00"}