{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:DEV4UAAUJAICW4UAGOOYKK7575","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":"82e0b8e8e23bf93e244b00ba7eb7c471498f9d0351ee11b51979e398237893d4","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-05-04T18:03:59Z","title_canon_sha256":"f5acb22f5fb24a030cd407e76852d6ef5de2b9de2601d0503db034dc799d12ce"},"schema_version":"1.0","source":{"id":"2005.01762","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2005.01762","created_at":"2026-07-05T01:22:18Z"},{"alias_kind":"arxiv_version","alias_value":"2005.01762v1","created_at":"2026-07-05T01:22:18Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2005.01762","created_at":"2026-07-05T01:22:18Z"},{"alias_kind":"pith_short_12","alias_value":"DEV4UAAUJAIC","created_at":"2026-07-05T01:22:18Z"},{"alias_kind":"pith_short_16","alias_value":"DEV4UAAUJAICW4UA","created_at":"2026-07-05T01:22:18Z"},{"alias_kind":"pith_short_8","alias_value":"DEV4UAAU","created_at":"2026-07-05T01:22:18Z"}],"graph_snapshots":[{"event_id":"sha256:3b80cb590aeb8df1a1370ab43f85811710c5eada00f0b8dfdba9d9cea6fa7c0b","target":"graph","created_at":"2026-07-05T01:22:18Z","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/2005.01762/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, we study a class of higher derivative, non-local gravity which admits homogeneous and isotropic non-singular, bouncing universes in the absence of matter. At the linearized level, the theory propagates only a scalar degree of freedom, and no vector or tensor modes. The scalar can be made free from perturbative ghost instabilities, and has oscillatory and bounded evolution across the bounce.","authors_text":"Anupam Mazumdar, Jun Peng, K. Sravan Kumar, Shubham Maheshwari","cross_cats":["astro-ph.CO","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-05-04T18:03:59Z","title":"Stable, non-singular bouncing universe with only a scalar mode"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2005.01762","kind":"arxiv","version":1},"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":"sha256:0cfb5ddb48a88faee2f8e69f1965d6f7dbb623fa82a358318814635f40036b80","target":"record","created_at":"2026-07-05T01:22:18Z","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":"82e0b8e8e23bf93e244b00ba7eb7c471498f9d0351ee11b51979e398237893d4","cross_cats_sorted":["astro-ph.CO","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2020-05-04T18:03:59Z","title_canon_sha256":"f5acb22f5fb24a030cd407e76852d6ef5de2b9de2601d0503db034dc799d12ce"},"schema_version":"1.0","source":{"id":"2005.01762","kind":"arxiv","version":1}},"canonical_sha256":"192bca001448102b7280339d852bfdff6b5e9bd2fa39051c261235035df37a0a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"192bca001448102b7280339d852bfdff6b5e9bd2fa39051c261235035df37a0a","first_computed_at":"2026-07-05T01:22:18.513545Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:22:18.513545Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"dDQW4C/Dgx4+s0d0byA7XNGcmYkOMtTQFcpGf5dRfqyDKZga+brvUegTVDEaGQ4R3G8GhHRzUoZKbjvlDm4BBw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:22:18.514010Z","signed_message":"canonical_sha256_bytes"},"source_id":"2005.01762","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0cfb5ddb48a88faee2f8e69f1965d6f7dbb623fa82a358318814635f40036b80","sha256:3b80cb590aeb8df1a1370ab43f85811710c5eada00f0b8dfdba9d9cea6fa7c0b"],"state_sha256":"87906003d401c6fca1431cefeb2b53b04b2207154f0a37dc657d7ae447efe733"}