{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:L2IFS37DKJUB7NOIZG5EABPSAH","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":"28d9cd294be17b58572a0c56dd14653d28f81b266ad145639c717202afa49ae7","cross_cats_sorted":["astro-ph"],"license":"","primary_cat":"hep-ph","submitted_at":"2002-03-29T17:42:52Z","title_canon_sha256":"e83702eba758e6032b963872151d56d426a037fd387733f0966517070b89b1dd"},"schema_version":"1.0","source":{"id":"hep-ph/0203275","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/0203275","created_at":"2026-07-04T16:34:03Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/0203275v2","created_at":"2026-07-04T16:34:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/0203275","created_at":"2026-07-04T16:34:03Z"},{"alias_kind":"pith_short_12","alias_value":"L2IFS37DKJUB","created_at":"2026-07-04T16:34:03Z"},{"alias_kind":"pith_short_16","alias_value":"L2IFS37DKJUB7NOI","created_at":"2026-07-04T16:34:03Z"},{"alias_kind":"pith_short_8","alias_value":"L2IFS37D","created_at":"2026-07-04T16:34:03Z"}],"graph_snapshots":[{"event_id":"sha256:d2bd4f5d8ef55fd738c776bf6f74b65ad4dc20d83ff874b652cf6c2a696ebce1","target":"graph","created_at":"2026-07-04T16:34:03Z","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/hep-ph/0203275/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"At low energy, the four-dimensional effective action of the ekpyrotic model of the universe is equivalent to a slightly modified version of the pre big bang model. We discuss cosmological perturbations in these models. In particular we address the issue of matching the perturbations from a collapsing to an expanding phase in full generality. We show that, generically, one obtains $n=0$ for the spectrum of scalar perturbations in the original pre big model (with vanishing potential). When an exponential potential for the dilaton is included, a scale invariant spectrum ($n=1$) of adiabatic scala","authors_text":"F. Vernizzi (U. de Geneve), R. Durrer","cross_cats":["astro-ph"],"headline":"","license":"","primary_cat":"hep-ph","submitted_at":"2002-03-29T17:42:52Z","title":"Adiabatic perturbations in pre big bang models: matching conditions and scale invariance"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/0203275","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:a5e29352f8e8b3db0953f1eeccfad32652edc05c2f6b4f6b0e94257875800e7e","target":"record","created_at":"2026-07-04T16:34:03Z","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":"28d9cd294be17b58572a0c56dd14653d28f81b266ad145639c717202afa49ae7","cross_cats_sorted":["astro-ph"],"license":"","primary_cat":"hep-ph","submitted_at":"2002-03-29T17:42:52Z","title_canon_sha256":"e83702eba758e6032b963872151d56d426a037fd387733f0966517070b89b1dd"},"schema_version":"1.0","source":{"id":"hep-ph/0203275","kind":"arxiv","version":2}},"canonical_sha256":"5e90596fe352681fb5c8c9ba4005f201ea597e47782ba0f00517c0a3283c7794","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5e90596fe352681fb5c8c9ba4005f201ea597e47782ba0f00517c0a3283c7794","first_computed_at":"2026-07-04T16:34:03.310583Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:34:03.310583Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0YpaQQqvVM055p4bp37c1gGMooPxWrI7ntySOH7IYAXv+bCDX2IcCUwlPAOZ34QnQHfvxXtego/h1RFTVvviDw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:34:03.311014Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-ph/0203275","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a5e29352f8e8b3db0953f1eeccfad32652edc05c2f6b4f6b0e94257875800e7e","sha256:d2bd4f5d8ef55fd738c776bf6f74b65ad4dc20d83ff874b652cf6c2a696ebce1"],"state_sha256":"da63c18d3c6105b2fc8054875e37b7fb364f3421bd65296063b55866b822cc76"}