{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:3D5IWWIQNNCHJWLK5J4Y27PECV","short_pith_number":"pith:3D5IWWIQ","canonical_record":{"source":{"id":"1303.4752","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-03-19T20:16:26Z","cross_cats_sorted":["hep-th","math-ph","math.MP"],"title_canon_sha256":"6291d49d399a10286f950d3e6679e4b97f255243d28bd04dec1506a79c3cb2e9","abstract_canon_sha256":"8ef6ec4b1bb2ff9ef83a5f7f89208b408e73b0609db35161d7065620e5754c66"},"schema_version":"1.0"},"canonical_sha256":"d8fa8b59106b4474d96aea798d7de415740ae8046ecbfddd9459bc5d2cd38dac","source":{"kind":"arxiv","id":"1303.4752","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.4752","created_at":"2026-05-18T03:13:33Z"},{"alias_kind":"arxiv_version","alias_value":"1303.4752v2","created_at":"2026-05-18T03:13:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.4752","created_at":"2026-05-18T03:13:33Z"},{"alias_kind":"pith_short_12","alias_value":"3D5IWWIQNNCH","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"3D5IWWIQNNCHJWLK","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"3D5IWWIQ","created_at":"2026-05-18T12:27:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:3D5IWWIQNNCHJWLK5J4Y27PECV","target":"record","payload":{"canonical_record":{"source":{"id":"1303.4752","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-03-19T20:16:26Z","cross_cats_sorted":["hep-th","math-ph","math.MP"],"title_canon_sha256":"6291d49d399a10286f950d3e6679e4b97f255243d28bd04dec1506a79c3cb2e9","abstract_canon_sha256":"8ef6ec4b1bb2ff9ef83a5f7f89208b408e73b0609db35161d7065620e5754c66"},"schema_version":"1.0"},"canonical_sha256":"d8fa8b59106b4474d96aea798d7de415740ae8046ecbfddd9459bc5d2cd38dac","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:13:33.830721Z","signature_b64":"v3d8Ip6FyfjV+BPy4zD0g1piwoVhxJVy82lwFy45xfAPlO5EhwYNqUO4qidgMwWFAijDI+il64S/KnOReIyGCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d8fa8b59106b4474d96aea798d7de415740ae8046ecbfddd9459bc5d2cd38dac","last_reissued_at":"2026-05-18T03:13:33.829803Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:13:33.829803Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1303.4752","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":"2026-05-18T03:13:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vpjbU5rti5uMK86wl1gh46831V5E5YOtOIKIVnCo/vflybQj4C8g11QTaZIS/Pg9p+avm2egu9tuK8IM+zUlAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T17:44:43.897661Z"},"content_sha256":"b71c97a94554d698733a07423da0b84460c12094425440ec5dc2d599b1daad3b","schema_version":"1.0","event_id":"sha256:b71c97a94554d698733a07423da0b84460c12094425440ec5dc2d599b1daad3b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:3D5IWWIQNNCHJWLK5J4Y27PECV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Imaginary action, spinfoam asymptotics and the 'transplanckian' regime of loop quantum gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th","math-ph","math.MP"],"primary_cat":"gr-qc","authors_text":"Norbert Bodendorfer, Yasha Neiman","submitted_at":"2013-03-19T20:16:26Z","abstract_excerpt":"It was recently noted that the on-shell Einstein-Hilbert action with York-Gibbons-Hawking boundary term has an imaginary part, proportional to the area of the codimension-2 surfaces on which the boundary normal becomes null. We discuss the extension of this result to first-order formulations of gravity. As a side effect, we settle the issue of the Holst modification vs. the Nieh-Yan density by demanding a variational principle with suitable boundary conditions. We then set out to find the imaginary action in the large-spin 4-simplex limit of the Lorentzian EPRL/FK spinfoam. It turns out that t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.4752","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":"2026-05-18T03:13:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sG+eTMg646hF4Gzs1pkREcgFRozsLLrh53XILoeEgAYSXr+GcDUIsmE49v2YzxiGYlKfc3ggobyN3+YP/oM7CQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T17:44:43.898427Z"},"content_sha256":"e5343487014b3633ef630dbccbee2341504ac4348f6aa267771393b0ff39c4f9","schema_version":"1.0","event_id":"sha256:e5343487014b3633ef630dbccbee2341504ac4348f6aa267771393b0ff39c4f9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3D5IWWIQNNCHJWLK5J4Y27PECV/bundle.json","state_url":"https://pith.science/pith/3D5IWWIQNNCHJWLK5J4Y27PECV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3D5IWWIQNNCHJWLK5J4Y27PECV/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":"2026-08-18T17:44:43Z","links":{"resolver":"https://pith.science/pith/3D5IWWIQNNCHJWLK5J4Y27PECV","bundle":"https://pith.science/pith/3D5IWWIQNNCHJWLK5J4Y27PECV/bundle.json","state":"https://pith.science/pith/3D5IWWIQNNCHJWLK5J4Y27PECV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3D5IWWIQNNCHJWLK5J4Y27PECV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:3D5IWWIQNNCHJWLK5J4Y27PECV","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":"8ef6ec4b1bb2ff9ef83a5f7f89208b408e73b0609db35161d7065620e5754c66","cross_cats_sorted":["hep-th","math-ph","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-03-19T20:16:26Z","title_canon_sha256":"6291d49d399a10286f950d3e6679e4b97f255243d28bd04dec1506a79c3cb2e9"},"schema_version":"1.0","source":{"id":"1303.4752","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.4752","created_at":"2026-05-18T03:13:33Z"},{"alias_kind":"arxiv_version","alias_value":"1303.4752v2","created_at":"2026-05-18T03:13:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.4752","created_at":"2026-05-18T03:13:33Z"},{"alias_kind":"pith_short_12","alias_value":"3D5IWWIQNNCH","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_16","alias_value":"3D5IWWIQNNCHJWLK","created_at":"2026-05-18T12:27:32Z"},{"alias_kind":"pith_short_8","alias_value":"3D5IWWIQ","created_at":"2026-05-18T12:27:32Z"}],"graph_snapshots":[{"event_id":"sha256:e5343487014b3633ef630dbccbee2341504ac4348f6aa267771393b0ff39c4f9","target":"graph","created_at":"2026-05-18T03:13:33Z","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":"It was recently noted that the on-shell Einstein-Hilbert action with York-Gibbons-Hawking boundary term has an imaginary part, proportional to the area of the codimension-2 surfaces on which the boundary normal becomes null. We discuss the extension of this result to first-order formulations of gravity. As a side effect, we settle the issue of the Holst modification vs. the Nieh-Yan density by demanding a variational principle with suitable boundary conditions. We then set out to find the imaginary action in the large-spin 4-simplex limit of the Lorentzian EPRL/FK spinfoam. It turns out that t","authors_text":"Norbert Bodendorfer, Yasha Neiman","cross_cats":["hep-th","math-ph","math.MP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-03-19T20:16:26Z","title":"Imaginary action, spinfoam asymptotics and the 'transplanckian' regime of loop quantum gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.4752","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:b71c97a94554d698733a07423da0b84460c12094425440ec5dc2d599b1daad3b","target":"record","created_at":"2026-05-18T03:13:33Z","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":"8ef6ec4b1bb2ff9ef83a5f7f89208b408e73b0609db35161d7065620e5754c66","cross_cats_sorted":["hep-th","math-ph","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2013-03-19T20:16:26Z","title_canon_sha256":"6291d49d399a10286f950d3e6679e4b97f255243d28bd04dec1506a79c3cb2e9"},"schema_version":"1.0","source":{"id":"1303.4752","kind":"arxiv","version":2}},"canonical_sha256":"d8fa8b59106b4474d96aea798d7de415740ae8046ecbfddd9459bc5d2cd38dac","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d8fa8b59106b4474d96aea798d7de415740ae8046ecbfddd9459bc5d2cd38dac","first_computed_at":"2026-05-18T03:13:33.829803Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:13:33.829803Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"v3d8Ip6FyfjV+BPy4zD0g1piwoVhxJVy82lwFy45xfAPlO5EhwYNqUO4qidgMwWFAijDI+il64S/KnOReIyGCg==","signature_status":"signed_v1","signed_at":"2026-05-18T03:13:33.830721Z","signed_message":"canonical_sha256_bytes"},"source_id":"1303.4752","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b71c97a94554d698733a07423da0b84460c12094425440ec5dc2d599b1daad3b","sha256:e5343487014b3633ef630dbccbee2341504ac4348f6aa267771393b0ff39c4f9"],"state_sha256":"af916fd15124d514bcc516404760cf476183b01c0f9580a233752b914ca69885"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tdEiBaR406ivjZLD5GbJRSyiO8tNCH1hsCJvMgw1fLXuDKc+j3FNOjXoJSQPc9HZTbgAXgMdS3pREKFErSVlDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T17:44:43.907309Z","bundle_sha256":"76484194d9f69dec5bc49c6d65843c41153defc7f99c54b1a596c8162e77f9aa"}}