{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1993:C4PHNFDUNXIW7OV64VSYW32TWI","short_pith_number":"pith:C4PHNFDU","canonical_record":{"source":{"id":"hep-th/9303025","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"1993-03-03T16:18:00Z","cross_cats_sorted":[],"title_canon_sha256":"ed0e72ca6e5c1d60e9759533a79533779eafc7685542e715c82447de387f65da","abstract_canon_sha256":"e3eb196aae5319cc6c506428b358acc7b1ecb8f82d6655331de7a66d3290b281"},"schema_version":"1.0"},"canonical_sha256":"171e7694746dd16fbabee5658b6f53b222923edd285ec970a7b70caabfdadbc4","source":{"kind":"arxiv","id":"hep-th/9303025","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/9303025","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"arxiv_version","alias_value":"hep-th/9303025v1","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/9303025","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"pith_short_12","alias_value":"C4PHNFDUNXIW","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"C4PHNFDUNXIW7OV6","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"C4PHNFDU","created_at":"2026-05-18T12:25:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1993:C4PHNFDUNXIW7OV64VSYW32TWI","target":"record","payload":{"canonical_record":{"source":{"id":"hep-th/9303025","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"1993-03-03T16:18:00Z","cross_cats_sorted":[],"title_canon_sha256":"ed0e72ca6e5c1d60e9759533a79533779eafc7685542e715c82447de387f65da","abstract_canon_sha256":"e3eb196aae5319cc6c506428b358acc7b1ecb8f82d6655331de7a66d3290b281"},"schema_version":"1.0"},"canonical_sha256":"171e7694746dd16fbabee5658b6f53b222923edd285ec970a7b70caabfdadbc4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:17:35.821445Z","signature_b64":"U/qRRSVD0YVYGDxa9yUlJDsKOU331/rgyRCOjDJiV0ecd1Dt4hflQtPdl4nAskxTwTXtUKsvIMMfshgDHbOXBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"171e7694746dd16fbabee5658b6f53b222923edd285ec970a7b70caabfdadbc4","last_reissued_at":"2026-05-18T04:17:35.820953Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:17:35.820953Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-th/9303025","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":"2026-05-18T04:17:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3Du7Xq891kus7TtcWILBZ+QrBaLLL06mBNkESWSg38x2aJ2mLwIA8xlm7pQGpOL+mKuYPobczApl2bcLBWHqBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T03:00:45.945953Z"},"content_sha256":"88ed724fa91d094e54b5adfe3240440668a34e75b7ea64a5167e1ac94b2e0864","schema_version":"1.0","event_id":"sha256:88ed724fa91d094e54b5adfe3240440668a34e75b7ea64a5167e1ac94b2e0864"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1993:C4PHNFDUNXIW7OV64VSYW32TWI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A New Sigma Model Action for the Four-Dimensional Green-Schwarz Heterotic Superstring","license":"","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Nathan Berkovits","submitted_at":"1993-03-03T16:18:00Z","abstract_excerpt":"The sigma model action described in this paper differs in four important features from the usual sigma model action for the four-dimensional Green-Schwarz heterotic superstring in a massless background. Firstly, the action is constructed on an N=(2,0) super-worldsheet using a Kahler potential and an Ogievetsky-Sokatchev constraint; secondly, the target-space background fields are unconstrained; thirdly, the target-space dilaton couples to the two-dimensional curvature; and fourthly, the action reduces in a flat background to a free-field action. A conjecture is made for generalizing this N=(2,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/9303025","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":"2026-05-18T04:17:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o2Sqrpq4iTrif916x4IGTgWx62uu9W9SkU00kN8m7gkP8bZYMfYCyPKwAThmCEfH1XGyElO5ABxqPXTAjgDSCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T03:00:45.946662Z"},"content_sha256":"ceef64836d2354193b280a8136d25a698360c944d5e013d26cb523957a112d8b","schema_version":"1.0","event_id":"sha256:ceef64836d2354193b280a8136d25a698360c944d5e013d26cb523957a112d8b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/C4PHNFDUNXIW7OV64VSYW32TWI/bundle.json","state_url":"https://pith.science/pith/C4PHNFDUNXIW7OV64VSYW32TWI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/C4PHNFDUNXIW7OV64VSYW32TWI/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":"2026-05-25T03:00:45Z","links":{"resolver":"https://pith.science/pith/C4PHNFDUNXIW7OV64VSYW32TWI","bundle":"https://pith.science/pith/C4PHNFDUNXIW7OV64VSYW32TWI/bundle.json","state":"https://pith.science/pith/C4PHNFDUNXIW7OV64VSYW32TWI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/C4PHNFDUNXIW7OV64VSYW32TWI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1993:C4PHNFDUNXIW7OV64VSYW32TWI","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":"e3eb196aae5319cc6c506428b358acc7b1ecb8f82d6655331de7a66d3290b281","cross_cats_sorted":[],"license":"","primary_cat":"hep-th","submitted_at":"1993-03-03T16:18:00Z","title_canon_sha256":"ed0e72ca6e5c1d60e9759533a79533779eafc7685542e715c82447de387f65da"},"schema_version":"1.0","source":{"id":"hep-th/9303025","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/9303025","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"arxiv_version","alias_value":"hep-th/9303025v1","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/9303025","created_at":"2026-05-18T04:17:35Z"},{"alias_kind":"pith_short_12","alias_value":"C4PHNFDUNXIW","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_16","alias_value":"C4PHNFDUNXIW7OV6","created_at":"2026-05-18T12:25:47Z"},{"alias_kind":"pith_short_8","alias_value":"C4PHNFDU","created_at":"2026-05-18T12:25:47Z"}],"graph_snapshots":[{"event_id":"sha256:ceef64836d2354193b280a8136d25a698360c944d5e013d26cb523957a112d8b","target":"graph","created_at":"2026-05-18T04:17:35Z","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":"The sigma model action described in this paper differs in four important features from the usual sigma model action for the four-dimensional Green-Schwarz heterotic superstring in a massless background. Firstly, the action is constructed on an N=(2,0) super-worldsheet using a Kahler potential and an Ogievetsky-Sokatchev constraint; secondly, the target-space background fields are unconstrained; thirdly, the target-space dilaton couples to the two-dimensional curvature; and fourthly, the action reduces in a flat background to a free-field action. A conjecture is made for generalizing this N=(2,","authors_text":"Nathan Berkovits","cross_cats":[],"headline":"","license":"","primary_cat":"hep-th","submitted_at":"1993-03-03T16:18:00Z","title":"A New Sigma Model Action for the Four-Dimensional Green-Schwarz Heterotic Superstring"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/9303025","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":"sha256:88ed724fa91d094e54b5adfe3240440668a34e75b7ea64a5167e1ac94b2e0864","target":"record","created_at":"2026-05-18T04:17:35Z","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":"e3eb196aae5319cc6c506428b358acc7b1ecb8f82d6655331de7a66d3290b281","cross_cats_sorted":[],"license":"","primary_cat":"hep-th","submitted_at":"1993-03-03T16:18:00Z","title_canon_sha256":"ed0e72ca6e5c1d60e9759533a79533779eafc7685542e715c82447de387f65da"},"schema_version":"1.0","source":{"id":"hep-th/9303025","kind":"arxiv","version":1}},"canonical_sha256":"171e7694746dd16fbabee5658b6f53b222923edd285ec970a7b70caabfdadbc4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"171e7694746dd16fbabee5658b6f53b222923edd285ec970a7b70caabfdadbc4","first_computed_at":"2026-05-18T04:17:35.820953Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:17:35.820953Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"U/qRRSVD0YVYGDxa9yUlJDsKOU331/rgyRCOjDJiV0ecd1Dt4hflQtPdl4nAskxTwTXtUKsvIMMfshgDHbOXBg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:17:35.821445Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-th/9303025","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:88ed724fa91d094e54b5adfe3240440668a34e75b7ea64a5167e1ac94b2e0864","sha256:ceef64836d2354193b280a8136d25a698360c944d5e013d26cb523957a112d8b"],"state_sha256":"3b11eca340937cabdabe6ef3277e0adbff8d5d81745e464947ec6f5e2d4683d0"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NUDPjKQ/vO3ddcm/XmwDzWntOeVOPVR3nty/s1HYN6f1kzu9OchCV8nBnBpgHt4lgdqrc3GA+7ynohTK2BY+Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T03:00:45.950370Z","bundle_sha256":"0ace52368ea09ff41c1481726052322915431f19a80decce9875f75b61e3b299"}}