{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:W3COPHC4GE4N77PBWWRF42DU2E","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":"0fb06aeed6529379f11d96e6093d875fd4d307ae2c09b2438d84b212820af0ce","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-12-06T22:27:40Z","title_canon_sha256":"1e838d43d1e66ce44bfef8c942bb25ca1e9c4992eb0166076039c9b9e6408221"},"schema_version":"1.0","source":{"id":"1812.02835","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1812.02835","created_at":"2026-05-17T23:51:30Z"},{"alias_kind":"arxiv_version","alias_value":"1812.02835v1","created_at":"2026-05-17T23:51:30Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1812.02835","created_at":"2026-05-17T23:51:30Z"},{"alias_kind":"pith_short_12","alias_value":"W3COPHC4GE4N","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_16","alias_value":"W3COPHC4GE4N77PB","created_at":"2026-05-18T12:32:59Z"},{"alias_kind":"pith_short_8","alias_value":"W3COPHC4","created_at":"2026-05-18T12:32:59Z"}],"graph_snapshots":[{"event_id":"sha256:1e88a7fbc9f1479132bf5350985f336d4f9273518c7b9d7dd04254a98ba67dc1","target":"graph","created_at":"2026-05-17T23:51:30Z","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":"We study the effect of space anisotropy in the entanglement generated by expanding universe on spin 0 and 1/2 fields. For massive scalar field we find revivals of entanglement entropy vs momentum after decreasing from the maximum at k = 0. In massive Dirac field the effect is a slight distortion of the non-monotonic profile giving rise to the maximum of entanglement entropy at k > 0. More interestingly, massless field of both type can only get entangled through anisotropy, with a maximum of entanglement entropy occurring at k > 0.","authors_text":"Roberto Pierini, Shahpoor Moradi, Stefano Mancini","cross_cats":["quant-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-12-06T22:27:40Z","title":"Entanglement in anisotropic expanding spacetime"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1812.02835","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":"sha256:98b86132b12be3332b086176c250a2d579c61d139f3a60b798c0d034dd10d7e2","target":"record","created_at":"2026-05-17T23:51:30Z","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":"0fb06aeed6529379f11d96e6093d875fd4d307ae2c09b2438d84b212820af0ce","cross_cats_sorted":["quant-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-12-06T22:27:40Z","title_canon_sha256":"1e838d43d1e66ce44bfef8c942bb25ca1e9c4992eb0166076039c9b9e6408221"},"schema_version":"1.0","source":{"id":"1812.02835","kind":"arxiv","version":1}},"canonical_sha256":"b6c4e79c5c3138dffde1b5a25e6874d10045d1ce751a5f80ffe8a136044bc495","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b6c4e79c5c3138dffde1b5a25e6874d10045d1ce751a5f80ffe8a136044bc495","first_computed_at":"2026-05-17T23:51:30.635273Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:51:30.635273Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"l3c1frchxSVZJonrZ4VRP2WtukE3KawN+NIpDP6pmz6WQoX2NeyUnEpoGHSxOgyGqpqvBkc+KBTdUu1D3jyJDw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:51:30.635691Z","signed_message":"canonical_sha256_bytes"},"source_id":"1812.02835","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:98b86132b12be3332b086176c250a2d579c61d139f3a60b798c0d034dd10d7e2","sha256:1e88a7fbc9f1479132bf5350985f336d4f9273518c7b9d7dd04254a98ba67dc1"],"state_sha256":"d0f3a0ce62b07b518f6202b4c876eccf725793f4d9a0db939b333a77c023241e"}