{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:7YJ2OZ6LSSSNXSNZSLED7LLCEJ","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":"a92e241b27428a8d60ef4117e6860fd5e608cc4f553017fddff8eb149e88a1e7","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2022-07-13T09:21:41Z","title_canon_sha256":"6dcb72fcb01f8e91b5518de504ae3053f1db8a3ed21a4ed224c896968ab81232"},"schema_version":"1.0","source":{"id":"2207.06068","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2207.06068","created_at":"2026-07-05T04:39:54Z"},{"alias_kind":"arxiv_version","alias_value":"2207.06068v1","created_at":"2026-07-05T04:39:54Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2207.06068","created_at":"2026-07-05T04:39:54Z"},{"alias_kind":"pith_short_12","alias_value":"7YJ2OZ6LSSSN","created_at":"2026-07-05T04:39:54Z"},{"alias_kind":"pith_short_16","alias_value":"7YJ2OZ6LSSSNXSNZ","created_at":"2026-07-05T04:39:54Z"},{"alias_kind":"pith_short_8","alias_value":"7YJ2OZ6L","created_at":"2026-07-05T04:39:54Z"}],"graph_snapshots":[{"event_id":"sha256:cb6f5fb29afe6eee5276dd2bd3d04ebf9cc9dffc907cc175da60f3dcc8f1d700","target":"graph","created_at":"2026-07-05T04:39:54Z","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/2207.06068/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The Pre-Big Bang cosmology inspired generations of cosmologists in attempts to cure the initial Big Bang singularity using a fundamental length scale as proposed by String Theory. The existence of a phase of collapse/inflation with increasing curvature followed by a cosmic bounce has been proposed as an alternative to standard inflation in the solution of the horizon and curvature problems. However the generation of a nearly scale-invariant spectrum of perturbations is not an automatic prediction of such scenarios. In this paper I review some general statements about the evolution of perturbat","authors_text":"V. Bozza","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2022-07-13T09:21:41Z","title":"Cosmological perturbations in bouncing cosmologies and the case of the Pre-Big Bang scenario"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2207.06068","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":"sha256:350eda3c7ee110b1e720d5f879e38cb1216d8f3496891d50b443f096d033aaf2","target":"record","created_at":"2026-07-05T04:39:54Z","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":"a92e241b27428a8d60ef4117e6860fd5e608cc4f553017fddff8eb149e88a1e7","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2022-07-13T09:21:41Z","title_canon_sha256":"6dcb72fcb01f8e91b5518de504ae3053f1db8a3ed21a4ed224c896968ab81232"},"schema_version":"1.0","source":{"id":"2207.06068","kind":"arxiv","version":1}},"canonical_sha256":"fe13a767cb94a4dbc9b992c83fad6222763326b0d4274fe296340b92c7fd9c40","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fe13a767cb94a4dbc9b992c83fad6222763326b0d4274fe296340b92c7fd9c40","first_computed_at":"2026-07-05T04:39:54.221806Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:39:54.221806Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HRowCc4iuB3imfy5UA+gZspjBF+QTDyKPZmdLbMpBo9CmudRh41X+QPqgkPbC5oRHmFz3ycgZldLV+I2P+AaBw==","signature_status":"signed_v1","signed_at":"2026-07-05T04:39:54.222150Z","signed_message":"canonical_sha256_bytes"},"source_id":"2207.06068","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:350eda3c7ee110b1e720d5f879e38cb1216d8f3496891d50b443f096d033aaf2","sha256:cb6f5fb29afe6eee5276dd2bd3d04ebf9cc9dffc907cc175da60f3dcc8f1d700"],"state_sha256":"31f83e910d7b04a6c4b168cefdbc314b4b3d8517b7a74cb066ca7dcdf80a5e1e"}