{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2002:VG3KMHNW2J3XATGEUQPIDI3F2C","short_pith_number":"pith:VG3KMHNW","canonical_record":{"source":{"id":"hep-th/0207228","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"2002-07-25T08:48:03Z","cross_cats_sorted":["astro-ph","gr-qc","hep-ph"],"title_canon_sha256":"8938df6a27f3a9908ef375cf9eaf59d798a0d986b0744e54d233b1141ab96991","abstract_canon_sha256":"bd2d38b0b56cb65225b28eb83a08488eddd8c3bb2428c33040ee04ea833bb785"},"schema_version":"1.0"},"canonical_sha256":"a9b6a61db6d277704cc4a41e81a365d0ac40124727391a33924500e8fecebd55","source":{"kind":"arxiv","id":"hep-th/0207228","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/0207228","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"arxiv_version","alias_value":"hep-th/0207228v2","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/0207228","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"pith_short_12","alias_value":"VG3KMHNW2J3X","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"pith_short_16","alias_value":"VG3KMHNW2J3XATGE","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"pith_short_8","alias_value":"VG3KMHNW","created_at":"2026-07-04T16:34:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2002:VG3KMHNW2J3XATGEUQPIDI3F2C","target":"record","payload":{"canonical_record":{"source":{"id":"hep-th/0207228","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"2002-07-25T08:48:03Z","cross_cats_sorted":["astro-ph","gr-qc","hep-ph"],"title_canon_sha256":"8938df6a27f3a9908ef375cf9eaf59d798a0d986b0744e54d233b1141ab96991","abstract_canon_sha256":"bd2d38b0b56cb65225b28eb83a08488eddd8c3bb2428c33040ee04ea833bb785"},"schema_version":"1.0"},"canonical_sha256":"a9b6a61db6d277704cc4a41e81a365d0ac40124727391a33924500e8fecebd55","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:34:50.556747Z","signature_b64":"JP8YqYBY2nPETPnwyv1APiYUsiZgkwqv3dQ2/uPV8dB8pAJMpPEb0bktKEyZLWRIrgZ48M9Wsq60QDfyjvtuAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a9b6a61db6d277704cc4a41e81a365d0ac40124727391a33924500e8fecebd55","last_reissued_at":"2026-07-04T16:34:50.556375Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:34:50.556375Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-th/0207228","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":"2026-07-04T16:34:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3bDQ2ICAqis5cAQfDTmYfhCc15nAZw6ocupOGa8zb+TaJL3ktij5913OgHqTiyNf0lDdTIyFQ3Qy89t2WhwRCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T20:21:42.826609Z"},"content_sha256":"93da80cd3f7fd1192e9d9264d725ed064bee5dfd4773d50eee7a29dbd0c68307","schema_version":"1.0","event_id":"sha256:93da80cd3f7fd1192e9d9264d725ed064bee5dfd4773d50eee7a29dbd0c68307"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2002:VG3KMHNW2J3XATGEUQPIDI3F2C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the Construction of Nonsingular Pre-Big-Bang and Ekpyrotic Cosmologies and the Resulting Density Perturbations","license":"","headline":"","cross_cats":["astro-ph","gr-qc","hep-ph"],"primary_cat":"hep-th","authors_text":"Fabio Finelli, Robert Brandenberger, Shinji Tsujikawa","submitted_at":"2002-07-25T08:48:03Z","abstract_excerpt":"We consider the construction of nonsingular Pre-Big-Bang and Ekpyrotic type cosmological models realized by the addition to the action of specific higher-order terms stemming from quantum corrections. We study models involving general relativity coupled to a single scalar field with a potential motivated by the Ekpyrotic scenario. We find that the inclusion of the string loop and quantum correction terms in the string frame makes it possible to obtain solutions of the variational equations which are nonsingular and bouncing in the Einstein frame, even when a negative exponential potential is p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/0207228","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/hep-th/0207228/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T16:34:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g9qRz511l7yC5qxetuZQ+uPFLWmjmPYx/ptD+iEqmxklv6MpArB3wb7GqONiJoyej62oT3O+JU7Quc2L2DXhDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T20:21:42.827123Z"},"content_sha256":"3b0813a1fcb0d7596fb29628307aa2564bb64f8ca683011fe727f61b0b1387cc","schema_version":"1.0","event_id":"sha256:3b0813a1fcb0d7596fb29628307aa2564bb64f8ca683011fe727f61b0b1387cc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VG3KMHNW2J3XATGEUQPIDI3F2C/bundle.json","state_url":"https://pith.science/pith/VG3KMHNW2J3XATGEUQPIDI3F2C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VG3KMHNW2J3XATGEUQPIDI3F2C/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":"2026-08-08T20:21:42Z","links":{"resolver":"https://pith.science/pith/VG3KMHNW2J3XATGEUQPIDI3F2C","bundle":"https://pith.science/pith/VG3KMHNW2J3XATGEUQPIDI3F2C/bundle.json","state":"https://pith.science/pith/VG3KMHNW2J3XATGEUQPIDI3F2C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VG3KMHNW2J3XATGEUQPIDI3F2C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:VG3KMHNW2J3XATGEUQPIDI3F2C","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":"bd2d38b0b56cb65225b28eb83a08488eddd8c3bb2428c33040ee04ea833bb785","cross_cats_sorted":["astro-ph","gr-qc","hep-ph"],"license":"","primary_cat":"hep-th","submitted_at":"2002-07-25T08:48:03Z","title_canon_sha256":"8938df6a27f3a9908ef375cf9eaf59d798a0d986b0744e54d233b1141ab96991"},"schema_version":"1.0","source":{"id":"hep-th/0207228","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/0207228","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"arxiv_version","alias_value":"hep-th/0207228v2","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/0207228","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"pith_short_12","alias_value":"VG3KMHNW2J3X","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"pith_short_16","alias_value":"VG3KMHNW2J3XATGE","created_at":"2026-07-04T16:34:50Z"},{"alias_kind":"pith_short_8","alias_value":"VG3KMHNW","created_at":"2026-07-04T16:34:50Z"}],"graph_snapshots":[{"event_id":"sha256:3b0813a1fcb0d7596fb29628307aa2564bb64f8ca683011fe727f61b0b1387cc","target":"graph","created_at":"2026-07-04T16:34:50Z","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-th/0207228/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We consider the construction of nonsingular Pre-Big-Bang and Ekpyrotic type cosmological models realized by the addition to the action of specific higher-order terms stemming from quantum corrections. We study models involving general relativity coupled to a single scalar field with a potential motivated by the Ekpyrotic scenario. We find that the inclusion of the string loop and quantum correction terms in the string frame makes it possible to obtain solutions of the variational equations which are nonsingular and bouncing in the Einstein frame, even when a negative exponential potential is p","authors_text":"Fabio Finelli, Robert Brandenberger, Shinji Tsujikawa","cross_cats":["astro-ph","gr-qc","hep-ph"],"headline":"","license":"","primary_cat":"hep-th","submitted_at":"2002-07-25T08:48:03Z","title":"On the Construction of Nonsingular Pre-Big-Bang and Ekpyrotic Cosmologies and the Resulting Density Perturbations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/0207228","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":"sha256:93da80cd3f7fd1192e9d9264d725ed064bee5dfd4773d50eee7a29dbd0c68307","target":"record","created_at":"2026-07-04T16:34:50Z","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":"bd2d38b0b56cb65225b28eb83a08488eddd8c3bb2428c33040ee04ea833bb785","cross_cats_sorted":["astro-ph","gr-qc","hep-ph"],"license":"","primary_cat":"hep-th","submitted_at":"2002-07-25T08:48:03Z","title_canon_sha256":"8938df6a27f3a9908ef375cf9eaf59d798a0d986b0744e54d233b1141ab96991"},"schema_version":"1.0","source":{"id":"hep-th/0207228","kind":"arxiv","version":2}},"canonical_sha256":"a9b6a61db6d277704cc4a41e81a365d0ac40124727391a33924500e8fecebd55","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a9b6a61db6d277704cc4a41e81a365d0ac40124727391a33924500e8fecebd55","first_computed_at":"2026-07-04T16:34:50.556375Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:34:50.556375Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JP8YqYBY2nPETPnwyv1APiYUsiZgkwqv3dQ2/uPV8dB8pAJMpPEb0bktKEyZLWRIrgZ48M9Wsq60QDfyjvtuAw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:34:50.556747Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-th/0207228","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93da80cd3f7fd1192e9d9264d725ed064bee5dfd4773d50eee7a29dbd0c68307","sha256:3b0813a1fcb0d7596fb29628307aa2564bb64f8ca683011fe727f61b0b1387cc"],"state_sha256":"c0070a34748db8b616edfa7748f49b0b7d2e3b80c2765e5d02097d284525b43a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dl7ISbLE5zl3C4465sScxdvo9QWyWdjcW2TCtAevDCp4jaqRsuizuxItVSvU3L7qXcv7ooogmp4zZk872ykgCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T20:21:42.830855Z","bundle_sha256":"c2b3470ce9f84b73e25c209be6a119407e90a7f0493cf25faa68a1c9224c38ec"}}