{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2026:OBDZ3I3RLE566FK6E2Z4AXP6RJ","short_pith_number":"pith:OBDZ3I3R","schema_version":"1.0","canonical_sha256":"70479da371593bef155e26b3c05dfe8a7db38e89e559d8fe1a728ffff4ba30d9","source":{"kind":"arxiv","id":"2602.23125","version":2},"attestation_state":"computed","paper":{"title":"A Maxwell Fish-Eye Lens in a Bose-Einstein Condensate","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph","physics.optics","quant-ph"],"primary_cat":"cond-mat.quant-gas","authors_text":"Duncan H.J. O'Dell, Elinor Kath, Floriane Arrouas, Hanyi Jang, Helmut Strobel, Jay Mehta, Jelte Duch\\^ene, Liam M. Farrell, Markus K. Oberthaler, Wyatt Kirkby","submitted_at":"2026-02-26T15:39:36Z","abstract_excerpt":"We experimentally realize an analogue of the optical Maxwell fish-eye lens (MFEL) using phononic excitations in a Bose-Einstein condensate (BEC). A MFEL is characterized by a radially symmetric, spatially varying refractive index with the remarkable property that rays emitted from any point within the lens are perfectly focused at their antipodal points. While the implementation of such gradient-index lenses is challenging in conventional optical systems, BECs offer a highly tunable platform in which the spatially varying speed of sound of collective excitations -- phonons, the acoustic analog"},"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":"2602.23125","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.quant-gas","submitted_at":"2026-02-26T15:39:36Z","cross_cats_sorted":["physics.atom-ph","physics.optics","quant-ph"],"title_canon_sha256":"ae1b6753cd726500b9e827770fd0eb77c28d7a0ada21ade96047cd040f6e98c0","abstract_canon_sha256":"e07eb5607cc8ebc467cc7ead779a563d8da98a1480bce61b32c10a6d2f0c1e82"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-07T02:19:48.081822Z","signature_b64":"ETE+S3j8pqH1yp4D6w0w/iyii7TZ7sEe8pnroBDayOldC490VBF0MqK/7bOje4uLCBVV1xKW5DJduBDYjPOIBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"70479da371593bef155e26b3c05dfe8a7db38e89e559d8fe1a728ffff4ba30d9","last_reissued_at":"2026-07-07T02:19:48.080735Z","signature_status":"signed_v1","first_computed_at":"2026-07-07T02:19:48.080735Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A Maxwell Fish-Eye Lens in a Bose-Einstein Condensate","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.atom-ph","physics.optics","quant-ph"],"primary_cat":"cond-mat.quant-gas","authors_text":"Duncan H.J. O'Dell, Elinor Kath, Floriane Arrouas, Hanyi Jang, Helmut Strobel, Jay Mehta, Jelte Duch\\^ene, Liam M. Farrell, Markus K. Oberthaler, Wyatt Kirkby","submitted_at":"2026-02-26T15:39:36Z","abstract_excerpt":"We experimentally realize an analogue of the optical Maxwell fish-eye lens (MFEL) using phononic excitations in a Bose-Einstein condensate (BEC). A MFEL is characterized by a radially symmetric, spatially varying refractive index with the remarkable property that rays emitted from any point within the lens are perfectly focused at their antipodal points. While the implementation of such gradient-index lenses is challenging in conventional optical systems, BECs offer a highly tunable platform in which the spatially varying speed of sound of collective excitations -- phonons, the acoustic analog"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2602.23125","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2602.23125/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2602.23125","created_at":"2026-07-07T02:19:48.080857+00:00"},{"alias_kind":"arxiv_version","alias_value":"2602.23125v2","created_at":"2026-07-07T02:19:48.080857+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2602.23125","created_at":"2026-07-07T02:19:48.080857+00:00"},{"alias_kind":"pith_short_12","alias_value":"OBDZ3I3RLE56","created_at":"2026-07-07T02:19:48.080857+00:00"},{"alias_kind":"pith_short_16","alias_value":"OBDZ3I3RLE566FK6","created_at":"2026-07-07T02:19:48.080857+00:00"},{"alias_kind":"pith_short_8","alias_value":"OBDZ3I3R","created_at":"2026-07-07T02:19:48.080857+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/OBDZ3I3RLE566FK6E2Z4AXP6RJ","json":"https://pith.science/pith/OBDZ3I3RLE566FK6E2Z4AXP6RJ.json","graph_json":"https://pith.science/api/pith-number/OBDZ3I3RLE566FK6E2Z4AXP6RJ/graph.json","events_json":"https://pith.science/api/pith-number/OBDZ3I3RLE566FK6E2Z4AXP6RJ/events.json","paper":"https://pith.science/paper/OBDZ3I3R"},"agent_actions":{"view_html":"https://pith.science/pith/OBDZ3I3RLE566FK6E2Z4AXP6RJ","download_json":"https://pith.science/pith/OBDZ3I3RLE566FK6E2Z4AXP6RJ.json","view_paper":"https://pith.science/paper/OBDZ3I3R","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2602.23125&json=true","fetch_graph":"https://pith.science/api/pith-number/OBDZ3I3RLE566FK6E2Z4AXP6RJ/graph.json","fetch_events":"https://pith.science/api/pith-number/OBDZ3I3RLE566FK6E2Z4AXP6RJ/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/OBDZ3I3RLE566FK6E2Z4AXP6RJ/action/timestamp_anchor","attest_storage":"https://pith.science/pith/OBDZ3I3RLE566FK6E2Z4AXP6RJ/action/storage_attestation","attest_author":"https://pith.science/pith/OBDZ3I3RLE566FK6E2Z4AXP6RJ/action/author_attestation","sign_citation":"https://pith.science/pith/OBDZ3I3RLE566FK6E2Z4AXP6RJ/action/citation_signature","submit_replication":"https://pith.science/pith/OBDZ3I3RLE566FK6E2Z4AXP6RJ/action/replication_record"}},"created_at":"2026-07-07T02:19:48.080857+00:00","updated_at":"2026-07-07T02:19:48.080857+00:00"}