{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2005:AGVZ6SOP726N5CE4I3GTQ7EIB7","short_pith_number":"pith:AGVZ6SOP","schema_version":"1.0","canonical_sha256":"01ab9f49cffebcde889c46cd387c880fe843887a5f526f21dfe28c76e7095c4a","source":{"kind":"arxiv","id":"quant-ph/0506113","version":2},"attestation_state":"computed","paper":{"title":"Entanglement in an expanding spacetime","license":"","headline":"","cross_cats":["gr-qc","hep-th"],"primary_cat":"quant-ph","authors_text":"F. P. Schuller (Perimeter Inst.), I. Fuentes-Schuller (Oxford U., J. L. Ball (Oxford U.), Perimeter Inst.)","submitted_at":"2005-06-14T19:57:47Z","abstract_excerpt":"We show that a dynamical spacetime generates entanglement between modes of a quantum field. Conversely, the entanglement encodes information concerning the underlying spacetime structure, which hints at the prospect of applications of this observation to cosmology. Here we illustrate this point by way of an analytically exactly soluble example, that of a scalar quantum field on a two-dimensional asymptotically flat Robertson-Walker expanding spacetime. We explicitly calculate the entanglement in the far future, for a quantum field residing in the vacuum state in the distant past. In this toy u"},"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":"quant-ph/0506113","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"quant-ph","submitted_at":"2005-06-14T19:57:47Z","cross_cats_sorted":["gr-qc","hep-th"],"title_canon_sha256":"55ae0341ff6bfbd169e6dd807bc35dd507ab3a5e865deaca298b649ea1df8fba","abstract_canon_sha256":"83368c5200dee1aac0f965b1d3d297493e94db8c40b209d80cbcbe62af105f10"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:49:31.129398Z","signature_b64":"mhKgtM2CvGwlOQo5Q2ZqsXdPfvaH52MS3GbIyAsvUCF97NkEwEVr6G8OXkM8+A2yWCJ9YWRVDG1qeS+V6PxDBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"01ab9f49cffebcde889c46cd387c880fe843887a5f526f21dfe28c76e7095c4a","last_reissued_at":"2026-07-04T14:49:31.129047Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:49:31.129047Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Entanglement in an expanding spacetime","license":"","headline":"","cross_cats":["gr-qc","hep-th"],"primary_cat":"quant-ph","authors_text":"F. P. Schuller (Perimeter Inst.), I. Fuentes-Schuller (Oxford U., J. L. Ball (Oxford U.), Perimeter Inst.)","submitted_at":"2005-06-14T19:57:47Z","abstract_excerpt":"We show that a dynamical spacetime generates entanglement between modes of a quantum field. Conversely, the entanglement encodes information concerning the underlying spacetime structure, which hints at the prospect of applications of this observation to cosmology. Here we illustrate this point by way of an analytically exactly soluble example, that of a scalar quantum field on a two-dimensional asymptotically flat Robertson-Walker expanding spacetime. We explicitly calculate the entanglement in the far future, for a quantum field residing in the vacuum state in the distant past. In this toy u"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"quant-ph/0506113","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/quant-ph/0506113/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":"quant-ph/0506113","created_at":"2026-07-04T14:49:31.129107+00:00"},{"alias_kind":"arxiv_version","alias_value":"quant-ph/0506113v2","created_at":"2026-07-04T14:49:31.129107+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.quant-ph/0506113","created_at":"2026-07-04T14:49:31.129107+00:00"},{"alias_kind":"pith_short_12","alias_value":"AGVZ6SOP726N","created_at":"2026-07-04T14:49:31.129107+00:00"},{"alias_kind":"pith_short_16","alias_value":"AGVZ6SOP726N5CE4","created_at":"2026-07-04T14:49:31.129107+00:00"},{"alias_kind":"pith_short_8","alias_value":"AGVZ6SOP","created_at":"2026-07-04T14:49:31.129107+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2601.02331","citing_title":"Quantum dynamics of cosmological particle production: interacting quantum field theories with matrix product states","ref_index":95,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/AGVZ6SOP726N5CE4I3GTQ7EIB7","json":"https://pith.science/pith/AGVZ6SOP726N5CE4I3GTQ7EIB7.json","graph_json":"https://pith.science/api/pith-number/AGVZ6SOP726N5CE4I3GTQ7EIB7/graph.json","events_json":"https://pith.science/api/pith-number/AGVZ6SOP726N5CE4I3GTQ7EIB7/events.json","paper":"https://pith.science/paper/AGVZ6SOP"},"agent_actions":{"view_html":"https://pith.science/pith/AGVZ6SOP726N5CE4I3GTQ7EIB7","download_json":"https://pith.science/pith/AGVZ6SOP726N5CE4I3GTQ7EIB7.json","view_paper":"https://pith.science/paper/AGVZ6SOP","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=quant-ph/0506113&json=true","fetch_graph":"https://pith.science/api/pith-number/AGVZ6SOP726N5CE4I3GTQ7EIB7/graph.json","fetch_events":"https://pith.science/api/pith-number/AGVZ6SOP726N5CE4I3GTQ7EIB7/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/AGVZ6SOP726N5CE4I3GTQ7EIB7/action/timestamp_anchor","attest_storage":"https://pith.science/pith/AGVZ6SOP726N5CE4I3GTQ7EIB7/action/storage_attestation","attest_author":"https://pith.science/pith/AGVZ6SOP726N5CE4I3GTQ7EIB7/action/author_attestation","sign_citation":"https://pith.science/pith/AGVZ6SOP726N5CE4I3GTQ7EIB7/action/citation_signature","submit_replication":"https://pith.science/pith/AGVZ6SOP726N5CE4I3GTQ7EIB7/action/replication_record"}},"created_at":"2026-07-04T14:49:31.129107+00:00","updated_at":"2026-07-04T14:49:31.129107+00:00"}