{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:YBXOUWU7CQ5SZTAMK4IWQ4QQD3","short_pith_number":"pith:YBXOUWU7","canonical_record":{"source":{"id":"1709.06800","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-20T10:35:05Z","cross_cats_sorted":["astro-ph.CO","hep-th"],"title_canon_sha256":"62d3e490a6af9cc0a0ee289075189d74152e864276b5af951eafc42f51f3f224","abstract_canon_sha256":"ea2c21bc12546258daa5ab023dd07026f104e4dadd8eb58e4f7dd26f03e4bb00"},"schema_version":"1.0"},"canonical_sha256":"c06eea5a9f143b2ccc0c57116872101ef0d9cceff3490ba3572c0995ace33d2f","source":{"kind":"arxiv","id":"1709.06800","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.06800","created_at":"2026-05-18T00:25:53Z"},{"alias_kind":"arxiv_version","alias_value":"1709.06800v2","created_at":"2026-05-18T00:25:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.06800","created_at":"2026-05-18T00:25:53Z"},{"alias_kind":"pith_short_12","alias_value":"YBXOUWU7CQ5S","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"YBXOUWU7CQ5SZTAM","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"YBXOUWU7","created_at":"2026-05-18T12:31:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:YBXOUWU7CQ5SZTAMK4IWQ4QQD3","target":"record","payload":{"canonical_record":{"source":{"id":"1709.06800","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-20T10:35:05Z","cross_cats_sorted":["astro-ph.CO","hep-th"],"title_canon_sha256":"62d3e490a6af9cc0a0ee289075189d74152e864276b5af951eafc42f51f3f224","abstract_canon_sha256":"ea2c21bc12546258daa5ab023dd07026f104e4dadd8eb58e4f7dd26f03e4bb00"},"schema_version":"1.0"},"canonical_sha256":"c06eea5a9f143b2ccc0c57116872101ef0d9cceff3490ba3572c0995ace33d2f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:25:53.117522Z","signature_b64":"T4lrc/OYOxPxuOWCMtgo8Q1BKixZAg3ha+bxvJNLYLjEjYorNxhdMis054TbqVkt7TBR0WJ+Y6Oh3cFzd8wACg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c06eea5a9f143b2ccc0c57116872101ef0d9cceff3490ba3572c0995ace33d2f","last_reissued_at":"2026-05-18T00:25:53.116951Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:25:53.116951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1709.06800","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":"2026-05-18T00:25:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PcgviLxy9tYUZM41OGp9NiEiVUvoU725eR8CDXavHJ8fPzeQGCuwuRyEolgIrJTNbrbzvfny9y49KcbiooGMAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T13:10:58.102111Z"},"content_sha256":"2405e019024c18e669dd45a2052205cea05b397010810c78d00c6f70023b1f64","schema_version":"1.0","event_id":"sha256:2405e019024c18e669dd45a2052205cea05b397010810c78d00c6f70023b1f64"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:YBXOUWU7CQ5SZTAMK4IWQ4QQD3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Is exponential gravity a viable description for the whole cosmological history?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","hep-th"],"primary_cat":"gr-qc","authors_text":"Diego Saez-Chillon Gomez, German S. Sharov, Sergei D. Odintsov","submitted_at":"2017-09-20T10:35:05Z","abstract_excerpt":"Here we analysed a particular type of $F(R)$ gravity, the so-called exponential gravity which includes an exponential function of the Ricci scalar in the action. Such term represents a correction to the usual Hilbert-Einstein action. By using Supernovae Ia, Barionic Acoustic Oscillations, Cosmic Microwave Background and $H(z)$ data, the free parameters of the model are well constrained. The results show that such corrections to General Relativity become important at cosmological scales and at late-times, providing an alternative to the dark energy problem. In addition, the fits do not determin"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.06800","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":"2026-05-18T00:25:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"B/eb9tJtSMLE8DjfSLnDJVo0BPhDFT6U5axoUT6ZlQ2f5iuKn6b5ObOD87GY+CVpgBxK4lsucjR3U89FLJjxDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T13:10:58.102777Z"},"content_sha256":"28762afea5a62a81463dc443ec6474a54bd761be0edce6f0005f4c1c601bb704","schema_version":"1.0","event_id":"sha256:28762afea5a62a81463dc443ec6474a54bd761be0edce6f0005f4c1c601bb704"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YBXOUWU7CQ5SZTAMK4IWQ4QQD3/bundle.json","state_url":"https://pith.science/pith/YBXOUWU7CQ5SZTAMK4IWQ4QQD3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YBXOUWU7CQ5SZTAMK4IWQ4QQD3/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":"2026-05-27T13:10:58Z","links":{"resolver":"https://pith.science/pith/YBXOUWU7CQ5SZTAMK4IWQ4QQD3","bundle":"https://pith.science/pith/YBXOUWU7CQ5SZTAMK4IWQ4QQD3/bundle.json","state":"https://pith.science/pith/YBXOUWU7CQ5SZTAMK4IWQ4QQD3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YBXOUWU7CQ5SZTAMK4IWQ4QQD3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:YBXOUWU7CQ5SZTAMK4IWQ4QQD3","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":"ea2c21bc12546258daa5ab023dd07026f104e4dadd8eb58e4f7dd26f03e4bb00","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-20T10:35:05Z","title_canon_sha256":"62d3e490a6af9cc0a0ee289075189d74152e864276b5af951eafc42f51f3f224"},"schema_version":"1.0","source":{"id":"1709.06800","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1709.06800","created_at":"2026-05-18T00:25:53Z"},{"alias_kind":"arxiv_version","alias_value":"1709.06800v2","created_at":"2026-05-18T00:25:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1709.06800","created_at":"2026-05-18T00:25:53Z"},{"alias_kind":"pith_short_12","alias_value":"YBXOUWU7CQ5S","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_16","alias_value":"YBXOUWU7CQ5SZTAM","created_at":"2026-05-18T12:31:56Z"},{"alias_kind":"pith_short_8","alias_value":"YBXOUWU7","created_at":"2026-05-18T12:31:56Z"}],"graph_snapshots":[{"event_id":"sha256:28762afea5a62a81463dc443ec6474a54bd761be0edce6f0005f4c1c601bb704","target":"graph","created_at":"2026-05-18T00:25:53Z","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":"Here we analysed a particular type of $F(R)$ gravity, the so-called exponential gravity which includes an exponential function of the Ricci scalar in the action. Such term represents a correction to the usual Hilbert-Einstein action. By using Supernovae Ia, Barionic Acoustic Oscillations, Cosmic Microwave Background and $H(z)$ data, the free parameters of the model are well constrained. The results show that such corrections to General Relativity become important at cosmological scales and at late-times, providing an alternative to the dark energy problem. In addition, the fits do not determin","authors_text":"Diego Saez-Chillon Gomez, German S. Sharov, Sergei D. Odintsov","cross_cats":["astro-ph.CO","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-20T10:35:05Z","title":"Is exponential gravity a viable description for the whole cosmological history?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1709.06800","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":"sha256:2405e019024c18e669dd45a2052205cea05b397010810c78d00c6f70023b1f64","target":"record","created_at":"2026-05-18T00:25:53Z","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":"ea2c21bc12546258daa5ab023dd07026f104e4dadd8eb58e4f7dd26f03e4bb00","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2017-09-20T10:35:05Z","title_canon_sha256":"62d3e490a6af9cc0a0ee289075189d74152e864276b5af951eafc42f51f3f224"},"schema_version":"1.0","source":{"id":"1709.06800","kind":"arxiv","version":2}},"canonical_sha256":"c06eea5a9f143b2ccc0c57116872101ef0d9cceff3490ba3572c0995ace33d2f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c06eea5a9f143b2ccc0c57116872101ef0d9cceff3490ba3572c0995ace33d2f","first_computed_at":"2026-05-18T00:25:53.116951Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:25:53.116951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"T4lrc/OYOxPxuOWCMtgo8Q1BKixZAg3ha+bxvJNLYLjEjYorNxhdMis054TbqVkt7TBR0WJ+Y6Oh3cFzd8wACg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:25:53.117522Z","signed_message":"canonical_sha256_bytes"},"source_id":"1709.06800","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2405e019024c18e669dd45a2052205cea05b397010810c78d00c6f70023b1f64","sha256:28762afea5a62a81463dc443ec6474a54bd761be0edce6f0005f4c1c601bb704"],"state_sha256":"417ead002581164e3c203ef13239887b7035762dd170951aae1ba539e99d91ed"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uWadGqsFE3up6WnvCfQ41G9uky8IzYaNLve8poCGIv1zQ2R2WwNkA/MdsOVIkrTngiHS48Vta7CwnLaQBuNnCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T13:10:58.106238Z","bundle_sha256":"c535a20afc0ed259cef2e3c65a238436d51f581cf5330164880522b3d18f8115"}}