{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:D62UHGR2A77RTYPBGVAEABZBBV","short_pith_number":"pith:D62UHGR2","canonical_record":{"source":{"id":"1610.06797","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-10-21T14:15:34Z","cross_cats_sorted":[],"title_canon_sha256":"756eb2b7d2f268a505e1c52bbee7ffce8c9520661c374506a5ea6b2b18f09a04","abstract_canon_sha256":"b11c4d05429cd3464f1fd2d964ddd28c36ec1d384e84cec926d3339479d84323"},"schema_version":"1.0"},"canonical_sha256":"1fb5439a3a07ff19e1e135404007210d44d8f10d7c0221270d3b19d52d5a4663","source":{"kind":"arxiv","id":"1610.06797","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.06797","created_at":"2026-05-18T00:54:28Z"},{"alias_kind":"arxiv_version","alias_value":"1610.06797v2","created_at":"2026-05-18T00:54:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.06797","created_at":"2026-05-18T00:54:28Z"},{"alias_kind":"pith_short_12","alias_value":"D62UHGR2A77R","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_16","alias_value":"D62UHGR2A77RTYPB","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_8","alias_value":"D62UHGR2","created_at":"2026-05-18T12:30:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:D62UHGR2A77RTYPBGVAEABZBBV","target":"record","payload":{"canonical_record":{"source":{"id":"1610.06797","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-10-21T14:15:34Z","cross_cats_sorted":[],"title_canon_sha256":"756eb2b7d2f268a505e1c52bbee7ffce8c9520661c374506a5ea6b2b18f09a04","abstract_canon_sha256":"b11c4d05429cd3464f1fd2d964ddd28c36ec1d384e84cec926d3339479d84323"},"schema_version":"1.0"},"canonical_sha256":"1fb5439a3a07ff19e1e135404007210d44d8f10d7c0221270d3b19d52d5a4663","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:54:28.299415Z","signature_b64":"tm0XUlwoV8HYXbgctNJmWvHb3O32L6FB89RSv0epxmdD0P/3otRfmM21mLNSk4sMFpbHgERi7UolcbimN7qvCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1fb5439a3a07ff19e1e135404007210d44d8f10d7c0221270d3b19d52d5a4663","last_reissued_at":"2026-05-18T00:54:28.298833Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:54:28.298833Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1610.06797","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:54:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m5CqnuUfU8yCuOLfhMF9N/487xIdZlUZZ9UBe7G5y5fCel7tXhm+dfEk1pavcYLUUgkz3Ava2F9rJW0OayXBBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T21:36:14.483131Z"},"content_sha256":"8cc8dd7176a5ee760a897f1d514820bfd1258515220f0a135c5abc642dd6fd57","schema_version":"1.0","event_id":"sha256:8cc8dd7176a5ee760a897f1d514820bfd1258515220f0a135c5abc642dd6fd57"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:D62UHGR2A77RTYPBGVAEABZBBV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Uniqueness of the Fock quantization of scalar fields in a Bianchi I cosmology with unitary dynamics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Beatriz Elizaga Navascu\\'es, Guillermo A. Mena Marug\\'an, Javier Olmedo, Jer\\'onimo Cortez, Jos\\'e M. Velhinho, Mercedes Mart\\'in-Benito","submitted_at":"2016-10-21T14:15:34Z","abstract_excerpt":"The Fock quantization of free scalar fields is subject to an infinite ambiguity when it comes to choosing a set of annihilation and creation operators, choice that is equivalent to the determination of a vacuum state. In highly symmetric situations, this ambiguity can be removed by asking vacuum invariance under the symmetries of the system. Similarly, in stationary backgrounds, one can demand time-translation invariance plus positivity of the energy. However, in more general situations, additional criteria are needed. For the case of free (test) fields minimally coupled to a homogeneous and i"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.06797","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:54:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MRNm16AqGsXzr9SvDn6T1yg9hbFCNV4KHXeTya+eC7aDGapdQB57PV0aPH05OMz1UPNLobFDL5Kz6FwDoqtnDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T21:36:14.484072Z"},"content_sha256":"cad7c79f4472fae031ab7559c3f62cd55deb2be822efa0d6a6ce33ac37829a03","schema_version":"1.0","event_id":"sha256:cad7c79f4472fae031ab7559c3f62cd55deb2be822efa0d6a6ce33ac37829a03"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/D62UHGR2A77RTYPBGVAEABZBBV/bundle.json","state_url":"https://pith.science/pith/D62UHGR2A77RTYPBGVAEABZBBV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/D62UHGR2A77RTYPBGVAEABZBBV/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":"2026-05-30T21:36:14Z","links":{"resolver":"https://pith.science/pith/D62UHGR2A77RTYPBGVAEABZBBV","bundle":"https://pith.science/pith/D62UHGR2A77RTYPBGVAEABZBBV/bundle.json","state":"https://pith.science/pith/D62UHGR2A77RTYPBGVAEABZBBV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/D62UHGR2A77RTYPBGVAEABZBBV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:D62UHGR2A77RTYPBGVAEABZBBV","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":"b11c4d05429cd3464f1fd2d964ddd28c36ec1d384e84cec926d3339479d84323","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-10-21T14:15:34Z","title_canon_sha256":"756eb2b7d2f268a505e1c52bbee7ffce8c9520661c374506a5ea6b2b18f09a04"},"schema_version":"1.0","source":{"id":"1610.06797","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1610.06797","created_at":"2026-05-18T00:54:28Z"},{"alias_kind":"arxiv_version","alias_value":"1610.06797v2","created_at":"2026-05-18T00:54:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1610.06797","created_at":"2026-05-18T00:54:28Z"},{"alias_kind":"pith_short_12","alias_value":"D62UHGR2A77R","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_16","alias_value":"D62UHGR2A77RTYPB","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_8","alias_value":"D62UHGR2","created_at":"2026-05-18T12:30:09Z"}],"graph_snapshots":[{"event_id":"sha256:cad7c79f4472fae031ab7559c3f62cd55deb2be822efa0d6a6ce33ac37829a03","target":"graph","created_at":"2026-05-18T00:54:28Z","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":"The Fock quantization of free scalar fields is subject to an infinite ambiguity when it comes to choosing a set of annihilation and creation operators, choice that is equivalent to the determination of a vacuum state. In highly symmetric situations, this ambiguity can be removed by asking vacuum invariance under the symmetries of the system. Similarly, in stationary backgrounds, one can demand time-translation invariance plus positivity of the energy. However, in more general situations, additional criteria are needed. For the case of free (test) fields minimally coupled to a homogeneous and i","authors_text":"Beatriz Elizaga Navascu\\'es, Guillermo A. Mena Marug\\'an, Javier Olmedo, Jer\\'onimo Cortez, Jos\\'e M. Velhinho, Mercedes Mart\\'in-Benito","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-10-21T14:15:34Z","title":"Uniqueness of the Fock quantization of scalar fields in a Bianchi I cosmology with unitary dynamics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1610.06797","kind":"arxiv","version":2},"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":"sha256:8cc8dd7176a5ee760a897f1d514820bfd1258515220f0a135c5abc642dd6fd57","target":"record","created_at":"2026-05-18T00:54:28Z","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":"b11c4d05429cd3464f1fd2d964ddd28c36ec1d384e84cec926d3339479d84323","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2016-10-21T14:15:34Z","title_canon_sha256":"756eb2b7d2f268a505e1c52bbee7ffce8c9520661c374506a5ea6b2b18f09a04"},"schema_version":"1.0","source":{"id":"1610.06797","kind":"arxiv","version":2}},"canonical_sha256":"1fb5439a3a07ff19e1e135404007210d44d8f10d7c0221270d3b19d52d5a4663","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1fb5439a3a07ff19e1e135404007210d44d8f10d7c0221270d3b19d52d5a4663","first_computed_at":"2026-05-18T00:54:28.298833Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:54:28.298833Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tm0XUlwoV8HYXbgctNJmWvHb3O32L6FB89RSv0epxmdD0P/3otRfmM21mLNSk4sMFpbHgERi7UolcbimN7qvCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:54:28.299415Z","signed_message":"canonical_sha256_bytes"},"source_id":"1610.06797","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8cc8dd7176a5ee760a897f1d514820bfd1258515220f0a135c5abc642dd6fd57","sha256:cad7c79f4472fae031ab7559c3f62cd55deb2be822efa0d6a6ce33ac37829a03"],"state_sha256":"93b1d684a0468cf3c844fd71533b1247ba22f946008cd96e5e6b7ea7c2262e7c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lCPMnCgU6P7b7JOdFSLWrI8KKKzV5A0nZ6Nmj0m0Y0JtxveO+zFirG/wYO9h+TqEkQx3va6PYvEwlL8hDWMfBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T21:36:14.488930Z","bundle_sha256":"f8e25f826e64a59f384e772d1dbebd3ac0035e071f54d9e746dc46dcbaad8875"}}