{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2004:C7SLVF7PL34GUZTCQUMUA2XJ4W","short_pith_number":"pith:C7SLVF7P","canonical_record":{"source":{"id":"hep-th/0404226","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"2004-04-28T14:01:05Z","cross_cats_sorted":[],"title_canon_sha256":"08be9c10aeb4a71527ecbff0f37e6f0f10d38a21c72a4ba41f6e71dd3dd97ce7","abstract_canon_sha256":"9f0f2c646ad5aee4cb502d16958ec94cba00da1205e48c47f8bdc88029ec2b5d"},"schema_version":"1.0"},"canonical_sha256":"17e4ba97ef5ef86a66628519406ae9e5bc32afc43b9586e62e90933fd1cbc317","source":{"kind":"arxiv","id":"hep-th/0404226","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/0404226","created_at":"2026-05-18T04:19:22Z"},{"alias_kind":"arxiv_version","alias_value":"hep-th/0404226v1","created_at":"2026-05-18T04:19:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/0404226","created_at":"2026-05-18T04:19:22Z"},{"alias_kind":"pith_short_12","alias_value":"C7SLVF7PL34G","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"C7SLVF7PL34GUZTC","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"C7SLVF7P","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2004:C7SLVF7PL34GUZTCQUMUA2XJ4W","target":"record","payload":{"canonical_record":{"source":{"id":"hep-th/0404226","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"2004-04-28T14:01:05Z","cross_cats_sorted":[],"title_canon_sha256":"08be9c10aeb4a71527ecbff0f37e6f0f10d38a21c72a4ba41f6e71dd3dd97ce7","abstract_canon_sha256":"9f0f2c646ad5aee4cb502d16958ec94cba00da1205e48c47f8bdc88029ec2b5d"},"schema_version":"1.0"},"canonical_sha256":"17e4ba97ef5ef86a66628519406ae9e5bc32afc43b9586e62e90933fd1cbc317","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:19:22.522212Z","signature_b64":"Lgb9lPugYdIANVPG4UUtA8yEZrqXVoGybJ8iATHsLq2ViuYvuzvWvuLFdaeff66nl3LF64BMVoCy2PDSIcRBCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"17e4ba97ef5ef86a66628519406ae9e5bc32afc43b9586e62e90933fd1cbc317","last_reissued_at":"2026-05-18T04:19:22.521774Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:19:22.521774Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-th/0404226","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T04:19:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lqrRCduzHxcpu/i6zFbmg9ny1bNphF0vUCT7r3k/wEh1F4zW8xgmxkLZ9snVQ4GO1EmxMs0TGb0RcjcqFk4kAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T23:59:02.394819Z"},"content_sha256":"1d80d692a145b0c1ce2db7c23ddfc1e72d0f830c6aeb28124fc6b8e55152e1ac","schema_version":"1.0","event_id":"sha256:1d80d692a145b0c1ce2db7c23ddfc1e72d0f830c6aeb28124fc6b8e55152e1ac"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2004:C7SLVF7PL34GUZTCQUMUA2XJ4W","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On string backgrounds and (logarithmic) CFT","license":"","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Jorgen Rasmussen","submitted_at":"2004-04-28T14:01:05Z","abstract_excerpt":"We discuss the link between string backgrounds and the associated world-sheet CFTs. In the search for new backgrounds and CFTs, Penrose limits and Lie algebra contractions are important tools. The Nappi-Witten construction and the recently discovered logarithmic CFT by Bakas and Sfetsos, are considered as illustrations. We also speculate on possible extensions."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/0404226","kind":"arxiv","version":1},"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":"2026-05-18T04:19:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lQyOcfWM0SYsVTXz3hi7YJe3GU2x/ep0EyBnj4596FZMlKup6ay0Uy6OYvevlx5u3m1LUDKU8F7Fq7uQIVHSAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T23:59:02.395155Z"},"content_sha256":"6146679203d0240e00f98297ee96856b2d11d1fb50ed853ea87dcfe995f1bfea","schema_version":"1.0","event_id":"sha256:6146679203d0240e00f98297ee96856b2d11d1fb50ed853ea87dcfe995f1bfea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C7SLVF7PL34GUZTCQUMUA2XJ4W/bundle.json","state_url":"https://pith.science/pith/C7SLVF7PL34GUZTCQUMUA2XJ4W/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C7SLVF7PL34GUZTCQUMUA2XJ4W/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":"2026-05-29T23:59:02Z","links":{"resolver":"https://pith.science/pith/C7SLVF7PL34GUZTCQUMUA2XJ4W","bundle":"https://pith.science/pith/C7SLVF7PL34GUZTCQUMUA2XJ4W/bundle.json","state":"https://pith.science/pith/C7SLVF7PL34GUZTCQUMUA2XJ4W/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C7SLVF7PL34GUZTCQUMUA2XJ4W/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:C7SLVF7PL34GUZTCQUMUA2XJ4W","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":"9f0f2c646ad5aee4cb502d16958ec94cba00da1205e48c47f8bdc88029ec2b5d","cross_cats_sorted":[],"license":"","primary_cat":"hep-th","submitted_at":"2004-04-28T14:01:05Z","title_canon_sha256":"08be9c10aeb4a71527ecbff0f37e6f0f10d38a21c72a4ba41f6e71dd3dd97ce7"},"schema_version":"1.0","source":{"id":"hep-th/0404226","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/0404226","created_at":"2026-05-18T04:19:22Z"},{"alias_kind":"arxiv_version","alias_value":"hep-th/0404226v1","created_at":"2026-05-18T04:19:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/0404226","created_at":"2026-05-18T04:19:22Z"},{"alias_kind":"pith_short_12","alias_value":"C7SLVF7PL34G","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"C7SLVF7PL34GUZTC","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"C7SLVF7P","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:6146679203d0240e00f98297ee96856b2d11d1fb50ed853ea87dcfe995f1bfea","target":"graph","created_at":"2026-05-18T04:19:22Z","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":"We discuss the link between string backgrounds and the associated world-sheet CFTs. In the search for new backgrounds and CFTs, Penrose limits and Lie algebra contractions are important tools. The Nappi-Witten construction and the recently discovered logarithmic CFT by Bakas and Sfetsos, are considered as illustrations. We also speculate on possible extensions.","authors_text":"Jorgen Rasmussen","cross_cats":[],"headline":"","license":"","primary_cat":"hep-th","submitted_at":"2004-04-28T14:01:05Z","title":"On string backgrounds and (logarithmic) CFT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/0404226","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":"sha256:1d80d692a145b0c1ce2db7c23ddfc1e72d0f830c6aeb28124fc6b8e55152e1ac","target":"record","created_at":"2026-05-18T04:19:22Z","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":"9f0f2c646ad5aee4cb502d16958ec94cba00da1205e48c47f8bdc88029ec2b5d","cross_cats_sorted":[],"license":"","primary_cat":"hep-th","submitted_at":"2004-04-28T14:01:05Z","title_canon_sha256":"08be9c10aeb4a71527ecbff0f37e6f0f10d38a21c72a4ba41f6e71dd3dd97ce7"},"schema_version":"1.0","source":{"id":"hep-th/0404226","kind":"arxiv","version":1}},"canonical_sha256":"17e4ba97ef5ef86a66628519406ae9e5bc32afc43b9586e62e90933fd1cbc317","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"17e4ba97ef5ef86a66628519406ae9e5bc32afc43b9586e62e90933fd1cbc317","first_computed_at":"2026-05-18T04:19:22.521774Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:19:22.521774Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Lgb9lPugYdIANVPG4UUtA8yEZrqXVoGybJ8iATHsLq2ViuYvuzvWvuLFdaeff66nl3LF64BMVoCy2PDSIcRBCg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:19:22.522212Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-th/0404226","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1d80d692a145b0c1ce2db7c23ddfc1e72d0f830c6aeb28124fc6b8e55152e1ac","sha256:6146679203d0240e00f98297ee96856b2d11d1fb50ed853ea87dcfe995f1bfea"],"state_sha256":"fbe745c2e69b47a11bbb4d50df20dc5f6c26941962118ea73b7be40d250275f8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O3yANo0Ez/M9ARAHt2HAadEQW3VwAXEL33awaxqdVoWyKUiSOHXb80Qw/qDbywGDupSQizgz/5wT8xWEfmoDCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T23:59:02.397144Z","bundle_sha256":"630c99563491218f2c818cd6c4fc5ed8c67164697bd55e2b4c8981db5e5b27c6"}}