{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:MWRBSBFOWTJ3EPTY2YDFI27QBK","short_pith_number":"pith:MWRBSBFO","canonical_record":{"source":{"id":"1810.08911","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-10-21T08:07:57Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"6ecb879e7a695405f22d3d9b57b691ab5042a2a778170ecc33bd221194e8460c","abstract_canon_sha256":"39363a78c5f376899294d41731ac2f170c01623c0ff18438640d75a11178a4b1"},"schema_version":"1.0"},"canonical_sha256":"65a21904aeb4d3b23e78d606546bf00a989c379d3de95eebd16939db59912830","source":{"kind":"arxiv","id":"1810.08911","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.08911","created_at":"2026-05-17T23:52:21Z"},{"alias_kind":"arxiv_version","alias_value":"1810.08911v3","created_at":"2026-05-17T23:52:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.08911","created_at":"2026-05-17T23:52:21Z"},{"alias_kind":"pith_short_12","alias_value":"MWRBSBFOWTJ3","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"MWRBSBFOWTJ3EPTY","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"MWRBSBFO","created_at":"2026-05-18T12:32:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:MWRBSBFOWTJ3EPTY2YDFI27QBK","target":"record","payload":{"canonical_record":{"source":{"id":"1810.08911","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-10-21T08:07:57Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"6ecb879e7a695405f22d3d9b57b691ab5042a2a778170ecc33bd221194e8460c","abstract_canon_sha256":"39363a78c5f376899294d41731ac2f170c01623c0ff18438640d75a11178a4b1"},"schema_version":"1.0"},"canonical_sha256":"65a21904aeb4d3b23e78d606546bf00a989c379d3de95eebd16939db59912830","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:52:21.916759Z","signature_b64":"FQhuuLDCrlOyCYJWyBdJl8YIsejkb2kT/vGAM+5ZeX4MLtZzmcMC4IDijSqzbXQRTZeRS9BEdooQvr6W+SU0Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"65a21904aeb4d3b23e78d606546bf00a989c379d3de95eebd16939db59912830","last_reissued_at":"2026-05-17T23:52:21.915948Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:52:21.915948Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.08911","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":"2026-05-17T23:52:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ShTZVKUVxFmfNcEFlIxfyr/gRO/WjvO28L0uw4BiGUfTKDGWCGyTkO7fWLxj0odjy+uuW43d0bJ2b4C8gUHgBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T18:24:17.871190Z"},"content_sha256":"47fcdad6063f11e4258684ee927909c4333fdd94faf6adcc862d42ecd2d6f1e7","schema_version":"1.0","event_id":"sha256:47fcdad6063f11e4258684ee927909c4333fdd94faf6adcc862d42ecd2d6f1e7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:MWRBSBFOWTJ3EPTY2YDFI27QBK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Higher-order modified Starobinsky inflation","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"gr-qc","authors_text":"L. G. Medeiros, P. J. Pompeia, R. R. Cuzinatto","submitted_at":"2018-10-21T08:07:57Z","abstract_excerpt":"An extension of the Starobinsky model is proposed. Besides the usual Starobinsky Lagrangian, a term proportional to the derivative of the scalar curvature, $\\nabla_{\\mu}R\\nabla^{\\mu}R$, is considered. The analyzis is done in the Einstein frame with the introduction of a scalar field and a vector field. We show that inflation is attainable in our model, allowing for a graceful exit. We also build the cosmological perturbations and obtain the leading-order curvature power spectrum, scalar and tensor tilts and tensor-to-scalar ratio. The tensor and curvature power spectrums are compared to the mo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.08911","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":"2026-05-17T23:52:21Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JdnnoUNpG9IXLkJkrppUtjtQ2r35mKcr+TdSdK6VJVBM6XVBOi78o4IqjNbYz7xWDFdY1Psgd21/bRYb4R0QBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T18:24:17.871544Z"},"content_sha256":"4c7d878dedc5328be4ac05d7b51060909475a24b7a0050ff679d2b697461e303","schema_version":"1.0","event_id":"sha256:4c7d878dedc5328be4ac05d7b51060909475a24b7a0050ff679d2b697461e303"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MWRBSBFOWTJ3EPTY2YDFI27QBK/bundle.json","state_url":"https://pith.science/pith/MWRBSBFOWTJ3EPTY2YDFI27QBK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MWRBSBFOWTJ3EPTY2YDFI27QBK/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":"2026-06-02T18:24:17Z","links":{"resolver":"https://pith.science/pith/MWRBSBFOWTJ3EPTY2YDFI27QBK","bundle":"https://pith.science/pith/MWRBSBFOWTJ3EPTY2YDFI27QBK/bundle.json","state":"https://pith.science/pith/MWRBSBFOWTJ3EPTY2YDFI27QBK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MWRBSBFOWTJ3EPTY2YDFI27QBK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:MWRBSBFOWTJ3EPTY2YDFI27QBK","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":"39363a78c5f376899294d41731ac2f170c01623c0ff18438640d75a11178a4b1","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-10-21T08:07:57Z","title_canon_sha256":"6ecb879e7a695405f22d3d9b57b691ab5042a2a778170ecc33bd221194e8460c"},"schema_version":"1.0","source":{"id":"1810.08911","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.08911","created_at":"2026-05-17T23:52:21Z"},{"alias_kind":"arxiv_version","alias_value":"1810.08911v3","created_at":"2026-05-17T23:52:21Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.08911","created_at":"2026-05-17T23:52:21Z"},{"alias_kind":"pith_short_12","alias_value":"MWRBSBFOWTJ3","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_16","alias_value":"MWRBSBFOWTJ3EPTY","created_at":"2026-05-18T12:32:40Z"},{"alias_kind":"pith_short_8","alias_value":"MWRBSBFO","created_at":"2026-05-18T12:32:40Z"}],"graph_snapshots":[{"event_id":"sha256:4c7d878dedc5328be4ac05d7b51060909475a24b7a0050ff679d2b697461e303","target":"graph","created_at":"2026-05-17T23:52:21Z","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":"An extension of the Starobinsky model is proposed. Besides the usual Starobinsky Lagrangian, a term proportional to the derivative of the scalar curvature, $\\nabla_{\\mu}R\\nabla^{\\mu}R$, is considered. The analyzis is done in the Einstein frame with the introduction of a scalar field and a vector field. We show that inflation is attainable in our model, allowing for a graceful exit. We also build the cosmological perturbations and obtain the leading-order curvature power spectrum, scalar and tensor tilts and tensor-to-scalar ratio. The tensor and curvature power spectrums are compared to the mo","authors_text":"L. G. Medeiros, P. J. Pompeia, R. R. Cuzinatto","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-10-21T08:07:57Z","title":"Higher-order modified Starobinsky inflation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.08911","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":"sha256:47fcdad6063f11e4258684ee927909c4333fdd94faf6adcc862d42ecd2d6f1e7","target":"record","created_at":"2026-05-17T23:52:21Z","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":"39363a78c5f376899294d41731ac2f170c01623c0ff18438640d75a11178a4b1","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-10-21T08:07:57Z","title_canon_sha256":"6ecb879e7a695405f22d3d9b57b691ab5042a2a778170ecc33bd221194e8460c"},"schema_version":"1.0","source":{"id":"1810.08911","kind":"arxiv","version":3}},"canonical_sha256":"65a21904aeb4d3b23e78d606546bf00a989c379d3de95eebd16939db59912830","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"65a21904aeb4d3b23e78d606546bf00a989c379d3de95eebd16939db59912830","first_computed_at":"2026-05-17T23:52:21.915948Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:52:21.915948Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FQhuuLDCrlOyCYJWyBdJl8YIsejkb2kT/vGAM+5ZeX4MLtZzmcMC4IDijSqzbXQRTZeRS9BEdooQvr6W+SU0Bg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:52:21.916759Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.08911","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:47fcdad6063f11e4258684ee927909c4333fdd94faf6adcc862d42ecd2d6f1e7","sha256:4c7d878dedc5328be4ac05d7b51060909475a24b7a0050ff679d2b697461e303"],"state_sha256":"16ae0aa9ad7d24b9a7cb269bcf6396b8d30ca0482afead37e28589c23a2e6694"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QkVtsYYx44ai1RZ16w0qF/qcsNNMtOPymruwoIO3gYb9Vw7Sgex14+oNB4CLoH1X4s2A0idMpBQL66Pqq2FhAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T18:24:17.873396Z","bundle_sha256":"ad6918901c426a5c3596a3030952a6ad3caca013e1faff6b3eb691ccd8ccdd29"}}