{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:GSVHVO37BB5YXEOMHKO7A6WYV6","short_pith_number":"pith:GSVHVO37","canonical_record":{"source":{"id":"1805.05666","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-05-15T09:38:15Z","cross_cats_sorted":[],"title_canon_sha256":"26486b9fcb03e4dae39069bb18472c194bca9ced3124b2efc462d669dcad2819","abstract_canon_sha256":"af41f11ab02740f2de814c56fc641d66fd9b95e610469ca5f38bfeba392ed89b"},"schema_version":"1.0"},"canonical_sha256":"34aa7abb7f087b8b91cc3a9df07ad8af8b0a4a631b023a580f9afcb29e56d242","source":{"kind":"arxiv","id":"1805.05666","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.05666","created_at":"2026-05-18T00:15:59Z"},{"alias_kind":"arxiv_version","alias_value":"1805.05666v1","created_at":"2026-05-18T00:15:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.05666","created_at":"2026-05-18T00:15:59Z"},{"alias_kind":"pith_short_12","alias_value":"GSVHVO37BB5Y","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GSVHVO37BB5YXEOM","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GSVHVO37","created_at":"2026-05-18T12:32:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:GSVHVO37BB5YXEOMHKO7A6WYV6","target":"record","payload":{"canonical_record":{"source":{"id":"1805.05666","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-05-15T09:38:15Z","cross_cats_sorted":[],"title_canon_sha256":"26486b9fcb03e4dae39069bb18472c194bca9ced3124b2efc462d669dcad2819","abstract_canon_sha256":"af41f11ab02740f2de814c56fc641d66fd9b95e610469ca5f38bfeba392ed89b"},"schema_version":"1.0"},"canonical_sha256":"34aa7abb7f087b8b91cc3a9df07ad8af8b0a4a631b023a580f9afcb29e56d242","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:15:59.912435Z","signature_b64":"a0UmaSnIsEiqcGKpyFvEFX0cyZB8PtRQSEEvoUUPCPKSY+RKjv4o2cH1v6C4+eyx4Z0yV+mmA3PXZlS/FqkPAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"34aa7abb7f087b8b91cc3a9df07ad8af8b0a4a631b023a580f9afcb29e56d242","last_reissued_at":"2026-05-18T00:15:59.912046Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:15:59.912046Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1805.05666","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:15:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QieFs2QN7iQcFEvjLqV79qExXpNGxDkUgRYaWj4GILCYxzTj7luSyp9k6M79PxsIp9zRYpUXyTPMEnfsTXb2AQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T08:02:50.466187Z"},"content_sha256":"ae15180dcc058b4e37dc930873e9da31e22ed0b518d0cdb5296f194623139dd9","schema_version":"1.0","event_id":"sha256:ae15180dcc058b4e37dc930873e9da31e22ed0b518d0cdb5296f194623139dd9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:GSVHVO37BB5YXEOMHKO7A6WYV6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Bianchi I model as a prototype for a cyclical Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"gr-qc","authors_text":"Andrea Marchi, Giovanni Montani, Riccardo Moriconi","submitted_at":"2018-05-15T09:38:15Z","abstract_excerpt":"We analyze the dynamics of the Bianchi I model in the presence of stiff matter, an ultrarelativistic component and a small negative cosmological constant. We quantize this model in the framework of the polymer quantum mechanics, in order to introduce cut-off features in the minisuperspace dynamics.\n  We then apply to the polymer Wheeler-DeWitt equation, emerging from the Dirac constraint, an adiabatic approximation a la Vilenkin, which treats the Universe volume as a quasi-classical variable, becoming de facto the dynamical clock for the pure quantum degrees of freedom, here identified in the "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.05666","kind":"arxiv","version":1},"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":"2026-05-18T00:15:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W3eyCIXaawE3zCo6UF46fhKqT8jJb4qn6USC7BMS0RoxA9sbqfWYKq0GNbtWmkb/o48ACntpN6eYlp/xwx3PCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T08:02:50.466549Z"},"content_sha256":"f4a5c12814b5ae65c238c6b13bb68ef8e74eaec683a61b22c17f092e8be3615b","schema_version":"1.0","event_id":"sha256:f4a5c12814b5ae65c238c6b13bb68ef8e74eaec683a61b22c17f092e8be3615b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GSVHVO37BB5YXEOMHKO7A6WYV6/bundle.json","state_url":"https://pith.science/pith/GSVHVO37BB5YXEOMHKO7A6WYV6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GSVHVO37BB5YXEOMHKO7A6WYV6/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":"2026-06-05T08:02:50Z","links":{"resolver":"https://pith.science/pith/GSVHVO37BB5YXEOMHKO7A6WYV6","bundle":"https://pith.science/pith/GSVHVO37BB5YXEOMHKO7A6WYV6/bundle.json","state":"https://pith.science/pith/GSVHVO37BB5YXEOMHKO7A6WYV6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GSVHVO37BB5YXEOMHKO7A6WYV6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:GSVHVO37BB5YXEOMHKO7A6WYV6","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":"af41f11ab02740f2de814c56fc641d66fd9b95e610469ca5f38bfeba392ed89b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-05-15T09:38:15Z","title_canon_sha256":"26486b9fcb03e4dae39069bb18472c194bca9ced3124b2efc462d669dcad2819"},"schema_version":"1.0","source":{"id":"1805.05666","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1805.05666","created_at":"2026-05-18T00:15:59Z"},{"alias_kind":"arxiv_version","alias_value":"1805.05666v1","created_at":"2026-05-18T00:15:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.05666","created_at":"2026-05-18T00:15:59Z"},{"alias_kind":"pith_short_12","alias_value":"GSVHVO37BB5Y","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GSVHVO37BB5YXEOM","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GSVHVO37","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:f4a5c12814b5ae65c238c6b13bb68ef8e74eaec683a61b22c17f092e8be3615b","target":"graph","created_at":"2026-05-18T00:15:59Z","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 analyze the dynamics of the Bianchi I model in the presence of stiff matter, an ultrarelativistic component and a small negative cosmological constant. We quantize this model in the framework of the polymer quantum mechanics, in order to introduce cut-off features in the minisuperspace dynamics.\n  We then apply to the polymer Wheeler-DeWitt equation, emerging from the Dirac constraint, an adiabatic approximation a la Vilenkin, which treats the Universe volume as a quasi-classical variable, becoming de facto the dynamical clock for the pure quantum degrees of freedom, here identified in the ","authors_text":"Andrea Marchi, Giovanni Montani, Riccardo Moriconi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-05-15T09:38:15Z","title":"Bianchi I model as a prototype for a cyclical Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.05666","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:ae15180dcc058b4e37dc930873e9da31e22ed0b518d0cdb5296f194623139dd9","target":"record","created_at":"2026-05-18T00:15:59Z","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":"af41f11ab02740f2de814c56fc641d66fd9b95e610469ca5f38bfeba392ed89b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-05-15T09:38:15Z","title_canon_sha256":"26486b9fcb03e4dae39069bb18472c194bca9ced3124b2efc462d669dcad2819"},"schema_version":"1.0","source":{"id":"1805.05666","kind":"arxiv","version":1}},"canonical_sha256":"34aa7abb7f087b8b91cc3a9df07ad8af8b0a4a631b023a580f9afcb29e56d242","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"34aa7abb7f087b8b91cc3a9df07ad8af8b0a4a631b023a580f9afcb29e56d242","first_computed_at":"2026-05-18T00:15:59.912046Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:15:59.912046Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"a0UmaSnIsEiqcGKpyFvEFX0cyZB8PtRQSEEvoUUPCPKSY+RKjv4o2cH1v6C4+eyx4Z0yV+mmA3PXZlS/FqkPAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:15:59.912435Z","signed_message":"canonical_sha256_bytes"},"source_id":"1805.05666","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ae15180dcc058b4e37dc930873e9da31e22ed0b518d0cdb5296f194623139dd9","sha256:f4a5c12814b5ae65c238c6b13bb68ef8e74eaec683a61b22c17f092e8be3615b"],"state_sha256":"f03dc38fe74b464d67f5c9e3b05e51e454fff1ca3a92aa47afb773e66475827f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"i3xYwV53qkI5RpixXch9/dnE0T1luVLEj2Ar+aFSeUvWQmBe2jfCk+DZXhkTRZh1hbhHx2m4lHPNx8xOPp0MAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T08:02:50.468457Z","bundle_sha256":"9a6f2a18851f23438699ec3d57a01687e043dd811aceeb119ad043dd4b4a57af"}}