{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:7KBPL5DFAGE5TYGQGO64DNIUJN","short_pith_number":"pith:7KBPL5DF","canonical_record":{"source":{"id":"2102.02217","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-02-03T19:00:02Z","cross_cats_sorted":["gr-qc","hep-ph"],"title_canon_sha256":"552a459239634d3e9d59f48682e2c40f7444b65f6a24607ce728da3c2fa9dae5","abstract_canon_sha256":"a30bcb6f2275195e7ce45069c6cd2a670b9c8c68ff27c0488c2a98281400e460"},"schema_version":"1.0"},"canonical_sha256":"fa82f5f4650189d9e0d033bdc1b5144b5db6a92457b19590dbfc7193b32a6124","source":{"kind":"arxiv","id":"2102.02217","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.02217","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"arxiv_version","alias_value":"2102.02217v3","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.02217","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"pith_short_12","alias_value":"7KBPL5DFAGE5","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"pith_short_16","alias_value":"7KBPL5DFAGE5TYGQ","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"pith_short_8","alias_value":"7KBPL5DF","created_at":"2026-07-05T03:45:26Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:7KBPL5DFAGE5TYGQGO64DNIUJN","target":"record","payload":{"canonical_record":{"source":{"id":"2102.02217","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-02-03T19:00:02Z","cross_cats_sorted":["gr-qc","hep-ph"],"title_canon_sha256":"552a459239634d3e9d59f48682e2c40f7444b65f6a24607ce728da3c2fa9dae5","abstract_canon_sha256":"a30bcb6f2275195e7ce45069c6cd2a670b9c8c68ff27c0488c2a98281400e460"},"schema_version":"1.0"},"canonical_sha256":"fa82f5f4650189d9e0d033bdc1b5144b5db6a92457b19590dbfc7193b32a6124","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:45:26.842857Z","signature_b64":"poTw4xU0s8VCW19HxvP9FR/Ww7KXWi6++4wSfr++NCDPsEBYsbByf6wBUzxlfGXIoX0+cU74HGVTyhwD+ltUCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fa82f5f4650189d9e0d033bdc1b5144b5db6a92457b19590dbfc7193b32a6124","last_reissued_at":"2026-07-05T03:45:26.842377Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:45:26.842377Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2102.02217","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:45:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7z2ZTzy68Nf7MhY4FTdmLfbVe3yjyov2D1MW6nHzqUDWiU9JGe/slIlSUPWN4szPn91imfzs5tenNijQfDBvBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T13:16:23.148660Z"},"content_sha256":"c865d1af43845d80382c30cefeac1b3c5682574d7a3b77a229b32e6787c3d2e6","schema_version":"1.0","event_id":"sha256:c865d1af43845d80382c30cefeac1b3c5682574d7a3b77a229b32e6787c3d2e6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:7KBPL5DFAGE5TYGQGO64DNIUJN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Reconstructing the graviton","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","hep-ph"],"primary_cat":"hep-th","authors_text":"Alfio Bonanno, Jan M. Pawlowski, Manuel Reichert, Tobias Denz","submitted_at":"2021-02-03T19:00:02Z","abstract_excerpt":"We reconstruct the Lorentzian graviton propagator in asymptotically safe quantum gravity from Euclidean data. The reconstruction is applied to both the dynamical fluctuation graviton and the background graviton propagator. We prove that the spectral function of the latter necessarily has negative parts similar to, and for the same reasons, as the gluon spectral function. In turn, the spectral function of the dynamical graviton is positive. We argue that the latter enters cross sections and other observables in asymptotically safe quantum gravity. Hence, its positivity may hint at the unitarity"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.02217","kind":"arxiv","version":3},"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/2102.02217/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:45:26Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ndzxonlMmd9BCnlsfmnRKtysZY+aQSATPLRjqwrtBfwrdbmLgfdUbzH2PvyygqDvu0CaNy4Z0MgXm1nZSU2kDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T13:16:23.149063Z"},"content_sha256":"bc255834b70a52217518687a1dd89a5e71ae333a83330f187bfbff5988d0fb18","schema_version":"1.0","event_id":"sha256:bc255834b70a52217518687a1dd89a5e71ae333a83330f187bfbff5988d0fb18"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7KBPL5DFAGE5TYGQGO64DNIUJN/bundle.json","state_url":"https://pith.science/pith/7KBPL5DFAGE5TYGQGO64DNIUJN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7KBPL5DFAGE5TYGQGO64DNIUJN/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":"2026-08-07T13:16:23Z","links":{"resolver":"https://pith.science/pith/7KBPL5DFAGE5TYGQGO64DNIUJN","bundle":"https://pith.science/pith/7KBPL5DFAGE5TYGQGO64DNIUJN/bundle.json","state":"https://pith.science/pith/7KBPL5DFAGE5TYGQGO64DNIUJN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7KBPL5DFAGE5TYGQGO64DNIUJN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:7KBPL5DFAGE5TYGQGO64DNIUJN","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":"a30bcb6f2275195e7ce45069c6cd2a670b9c8c68ff27c0488c2a98281400e460","cross_cats_sorted":["gr-qc","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-02-03T19:00:02Z","title_canon_sha256":"552a459239634d3e9d59f48682e2c40f7444b65f6a24607ce728da3c2fa9dae5"},"schema_version":"1.0","source":{"id":"2102.02217","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.02217","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"arxiv_version","alias_value":"2102.02217v3","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.02217","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"pith_short_12","alias_value":"7KBPL5DFAGE5","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"pith_short_16","alias_value":"7KBPL5DFAGE5TYGQ","created_at":"2026-07-05T03:45:26Z"},{"alias_kind":"pith_short_8","alias_value":"7KBPL5DF","created_at":"2026-07-05T03:45:26Z"}],"graph_snapshots":[{"event_id":"sha256:bc255834b70a52217518687a1dd89a5e71ae333a83330f187bfbff5988d0fb18","target":"graph","created_at":"2026-07-05T03:45:26Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2102.02217/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We reconstruct the Lorentzian graviton propagator in asymptotically safe quantum gravity from Euclidean data. The reconstruction is applied to both the dynamical fluctuation graviton and the background graviton propagator. We prove that the spectral function of the latter necessarily has negative parts similar to, and for the same reasons, as the gluon spectral function. In turn, the spectral function of the dynamical graviton is positive. We argue that the latter enters cross sections and other observables in asymptotically safe quantum gravity. Hence, its positivity may hint at the unitarity","authors_text":"Alfio Bonanno, Jan M. Pawlowski, Manuel Reichert, Tobias Denz","cross_cats":["gr-qc","hep-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-02-03T19:00:02Z","title":"Reconstructing the graviton"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.02217","kind":"arxiv","version":3},"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:c865d1af43845d80382c30cefeac1b3c5682574d7a3b77a229b32e6787c3d2e6","target":"record","created_at":"2026-07-05T03:45:26Z","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":"a30bcb6f2275195e7ce45069c6cd2a670b9c8c68ff27c0488c2a98281400e460","cross_cats_sorted":["gr-qc","hep-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-th","submitted_at":"2021-02-03T19:00:02Z","title_canon_sha256":"552a459239634d3e9d59f48682e2c40f7444b65f6a24607ce728da3c2fa9dae5"},"schema_version":"1.0","source":{"id":"2102.02217","kind":"arxiv","version":3}},"canonical_sha256":"fa82f5f4650189d9e0d033bdc1b5144b5db6a92457b19590dbfc7193b32a6124","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fa82f5f4650189d9e0d033bdc1b5144b5db6a92457b19590dbfc7193b32a6124","first_computed_at":"2026-07-05T03:45:26.842377Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:45:26.842377Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"poTw4xU0s8VCW19HxvP9FR/Ww7KXWi6++4wSfr++NCDPsEBYsbByf6wBUzxlfGXIoX0+cU74HGVTyhwD+ltUCQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:45:26.842857Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.02217","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c865d1af43845d80382c30cefeac1b3c5682574d7a3b77a229b32e6787c3d2e6","sha256:bc255834b70a52217518687a1dd89a5e71ae333a83330f187bfbff5988d0fb18"],"state_sha256":"46dd1ef0c078b5387b17a545b402da8227c6a0f6589ee59cffab88879f8e917c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gIPUZb5WDvZ9QpFZQCLpeYNT9cqGzH6jS8JfF/mDC4OWjj+47HX/60Uj0O/QyWJ9/oAcR9NatVNfhzYydTgpDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T13:16:23.152034Z","bundle_sha256":"b5c40e1862cebbef7442e2269cc6e5f83a966311ef7cd9f79c364f777e591237"}}