{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1995:AVK5LY27HT3BRQ7GRNNZBLOUKG","short_pith_number":"pith:AVK5LY27","canonical_record":{"source":{"id":"hep-th/9509142","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"1995-09-25T22:29:46Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"b97e1f57e4c92c3d8cf7365228adcd7b7ec8a0fe9b2f33551fa52cb865a172e8","abstract_canon_sha256":"e29bd6bf3908484f7266fe471b5c73c64b98cbe4ee8b69a97c2da3f7a76442a3"},"schema_version":"1.0"},"canonical_sha256":"0555d5e35f3cf618c3e68b5b90add45184774f0d31a6f39c26f0422ea40e8754","source":{"kind":"arxiv","id":"hep-th/9509142","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/9509142","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"arxiv_version","alias_value":"hep-th/9509142v3","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/9509142","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"pith_short_12","alias_value":"AVK5LY27HT3B","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"AVK5LY27HT3BRQ7G","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"AVK5LY27","created_at":"2026-05-18T12:25:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1995:AVK5LY27HT3BRQ7GRNNZBLOUKG","target":"record","payload":{"canonical_record":{"source":{"id":"hep-th/9509142","kind":"arxiv","version":3},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"1995-09-25T22:29:46Z","cross_cats_sorted":["gr-qc"],"title_canon_sha256":"b97e1f57e4c92c3d8cf7365228adcd7b7ec8a0fe9b2f33551fa52cb865a172e8","abstract_canon_sha256":"e29bd6bf3908484f7266fe471b5c73c64b98cbe4ee8b69a97c2da3f7a76442a3"},"schema_version":"1.0"},"canonical_sha256":"0555d5e35f3cf618c3e68b5b90add45184774f0d31a6f39c26f0422ea40e8754","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:17:35.099491Z","signature_b64":"3UBlDAiF5YVMKO0aYCDcpKljrvuA7eS9klaOAGIg1NAmxCPJy/Gf3MGqu6OlDqc5qkk7pwd1BfalcAllRhxxBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0555d5e35f3cf618c3e68b5b90add45184774f0d31a6f39c26f0422ea40e8754","last_reissued_at":"2026-05-18T04:17:35.099060Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:17:35.099060Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-th/9509142","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":"2026-05-18T04:17:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5eCv15Xa/BRLzFEWVOSOAIS6ZTOPa9xD6N0iXyqrdbxGYQrgAKCMCesXXt5NZ97UMH44VrsOtXinsSK8G7pmDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T10:38:37.362257Z"},"content_sha256":"6b9abef5c80af29c8fcd4cca278fd181ac245ab94fd1e5cb2bf01c4a80031c5c","schema_version":"1.0","event_id":"sha256:6b9abef5c80af29c8fcd4cca278fd181ac245ab94fd1e5cb2bf01c4a80031c5c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1995:AVK5LY27HT3BRQ7GRNNZBLOUKG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Consistent Spin-Two Coupling and Quadratic Gravitation","license":"","headline":"","cross_cats":["gr-qc"],"primary_cat":"hep-th","authors_text":"Ahmed Hindawi, Burt A. Ovrut, Daniel Waldram","submitted_at":"1995-09-25T22:29:46Z","abstract_excerpt":"A discussion of the field content of quadratic higher-derivative gravitation is presented, together with a new example of a massless spin-two field consistently coupled to gravity. The full quadratic gravity theory is shown to be equivalent to a canonical second-order theory of a massive scalar field, a massive spin-two symmetric tensor field and gravity. The conditions showing that the tensor field describes only spin-two degrees of freedom are derived. A limit of the second-order theory provides a new example of massless spin-two field consistently coupled to gravity. A restricted set of vac"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/9509142","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":""},"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":"2026-05-18T04:17:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ti5XQC8xvwFrxVKqR9X8nb8gHTPoeycbAU686Y6YwJ/nCuIzyQzqjsq+O6zHq/ng8sC/gT23nTXBmBDWoa1SAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T10:38:37.362618Z"},"content_sha256":"21d92a118d4b9b47252a0b8b347e10385fa6b50aec0935ecd8012c48421e28ba","schema_version":"1.0","event_id":"sha256:21d92a118d4b9b47252a0b8b347e10385fa6b50aec0935ecd8012c48421e28ba"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AVK5LY27HT3BRQ7GRNNZBLOUKG/bundle.json","state_url":"https://pith.science/pith/AVK5LY27HT3BRQ7GRNNZBLOUKG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AVK5LY27HT3BRQ7GRNNZBLOUKG/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":"2026-05-19T10:38:37Z","links":{"resolver":"https://pith.science/pith/AVK5LY27HT3BRQ7GRNNZBLOUKG","bundle":"https://pith.science/pith/AVK5LY27HT3BRQ7GRNNZBLOUKG/bundle.json","state":"https://pith.science/pith/AVK5LY27HT3BRQ7GRNNZBLOUKG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AVK5LY27HT3BRQ7GRNNZBLOUKG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1995:AVK5LY27HT3BRQ7GRNNZBLOUKG","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":"e29bd6bf3908484f7266fe471b5c73c64b98cbe4ee8b69a97c2da3f7a76442a3","cross_cats_sorted":["gr-qc"],"license":"","primary_cat":"hep-th","submitted_at":"1995-09-25T22:29:46Z","title_canon_sha256":"b97e1f57e4c92c3d8cf7365228adcd7b7ec8a0fe9b2f33551fa52cb865a172e8"},"schema_version":"1.0","source":{"id":"hep-th/9509142","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/9509142","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"arxiv_version","alias_value":"hep-th/9509142v3","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/9509142","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"pith_short_12","alias_value":"AVK5LY27HT3B","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"AVK5LY27HT3BRQ7G","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"AVK5LY27","created_at":"2026-05-18T12:25:47Z"}],"graph_snapshots":[{"event_id":"sha256:21d92a118d4b9b47252a0b8b347e10385fa6b50aec0935ecd8012c48421e28ba","target":"graph","created_at":"2026-05-18T04:17:35Z","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":"A discussion of the field content of quadratic higher-derivative gravitation is presented, together with a new example of a massless spin-two field consistently coupled to gravity. The full quadratic gravity theory is shown to be equivalent to a canonical second-order theory of a massive scalar field, a massive spin-two symmetric tensor field and gravity. The conditions showing that the tensor field describes only spin-two degrees of freedom are derived. A limit of the second-order theory provides a new example of massless spin-two field consistently coupled to gravity. A restricted set of vac","authors_text":"Ahmed Hindawi, Burt A. Ovrut, Daniel Waldram","cross_cats":["gr-qc"],"headline":"","license":"","primary_cat":"hep-th","submitted_at":"1995-09-25T22:29:46Z","title":"Consistent Spin-Two Coupling and Quadratic Gravitation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/9509142","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":"sha256:6b9abef5c80af29c8fcd4cca278fd181ac245ab94fd1e5cb2bf01c4a80031c5c","target":"record","created_at":"2026-05-18T04:17:35Z","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":"e29bd6bf3908484f7266fe471b5c73c64b98cbe4ee8b69a97c2da3f7a76442a3","cross_cats_sorted":["gr-qc"],"license":"","primary_cat":"hep-th","submitted_at":"1995-09-25T22:29:46Z","title_canon_sha256":"b97e1f57e4c92c3d8cf7365228adcd7b7ec8a0fe9b2f33551fa52cb865a172e8"},"schema_version":"1.0","source":{"id":"hep-th/9509142","kind":"arxiv","version":3}},"canonical_sha256":"0555d5e35f3cf618c3e68b5b90add45184774f0d31a6f39c26f0422ea40e8754","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0555d5e35f3cf618c3e68b5b90add45184774f0d31a6f39c26f0422ea40e8754","first_computed_at":"2026-05-18T04:17:35.099060Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:17:35.099060Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3UBlDAiF5YVMKO0aYCDcpKljrvuA7eS9klaOAGIg1NAmxCPJy/Gf3MGqu6OlDqc5qkk7pwd1BfalcAllRhxxBA==","signature_status":"signed_v1","signed_at":"2026-05-18T04:17:35.099491Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-th/9509142","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6b9abef5c80af29c8fcd4cca278fd181ac245ab94fd1e5cb2bf01c4a80031c5c","sha256:21d92a118d4b9b47252a0b8b347e10385fa6b50aec0935ecd8012c48421e28ba"],"state_sha256":"e40c84ee947f88cbbe55892a866ff5a4ba26d6d03df3689b7fb4a6fa6ddc5e93"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/Y9ayaQuKU2LUR0vpnLopTxk0q4c1KhK166OW5KGi7qFc1rGxybdN2pTfTibxjSPmEUepNVIzdqO6HTJmfhuAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T10:38:37.364203Z","bundle_sha256":"91622fea0215d39624ae6bddc9d32eec41ea4b2eefb03a7eae5cdcd058b88351"}}