{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:1996:R5FBB4ZDTEGVIWY75B2KYRDCWA","short_pith_number":"pith:R5FBB4ZD","schema_version":"1.0","canonical_sha256":"8f4a10f323990d545b1fe874ac4462b00ad1d9b671ab729d32c9689905690822","source":{"kind":"arxiv","id":"hep-th/9612108","version":2},"attestation_state":"computed","paper":{"title":"Point-like Instantons and the Spin(32)/Z2 Heterotic String","license":"","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Paul S. Aspinwall","submitted_at":"1996-12-10T21:00:04Z","abstract_excerpt":"We consider heterotic string theories compactified on a K3 surface which lead to an unbroken perturbative gauge group of Spin(32)/Z2. All solutions obtained are combinations of two types of point-like instanton --- one ``simple type'' as discovered by Witten and a new type associated to the ``generalized second Stiefel-Whitney class'' as introduced by Berkooz et al. The new type of instanton is associated to an enhancement of the gauge symmetry by Sp(4) and the addition of a massless tensor supermultiplet. It is shown that if four simple instantons coalesce at an orbifold point in the K3 surfa"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"hep-th/9612108","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-th","submitted_at":"1996-12-10T21:00:04Z","cross_cats_sorted":[],"title_canon_sha256":"55554f7a7f38abfe656f48eb1310a6575fd493ca903ef8b1568dacc30ebdb0c0","abstract_canon_sha256":"9fcbc4e73153f91b859cd18ce1fcc5261a04967264ac89b7d8b8b0799750b81a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:35:16.371860Z","signature_b64":"0aakygZmlN4Bv7fBxpESUvpfzzxx6mhonqoa1vedi9vYFLl3y9L+dId2SUgLnDsZrC63QIaCpk4NFSe8571uAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8f4a10f323990d545b1fe874ac4462b00ad1d9b671ab729d32c9689905690822","last_reissued_at":"2026-05-18T04:35:16.371349Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:35:16.371349Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Point-like Instantons and the Spin(32)/Z2 Heterotic String","license":"","headline":"","cross_cats":[],"primary_cat":"hep-th","authors_text":"Paul S. Aspinwall","submitted_at":"1996-12-10T21:00:04Z","abstract_excerpt":"We consider heterotic string theories compactified on a K3 surface which lead to an unbroken perturbative gauge group of Spin(32)/Z2. All solutions obtained are combinations of two types of point-like instanton --- one ``simple type'' as discovered by Witten and a new type associated to the ``generalized second Stiefel-Whitney class'' as introduced by Berkooz et al. The new type of instanton is associated to an enhancement of the gauge symmetry by Sp(4) and the addition of a massless tensor supermultiplet. It is shown that if four simple instantons coalesce at an orbifold point in the K3 surfa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-th/9612108","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":""},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"hep-th/9612108","created_at":"2026-05-18T04:35:16.371431+00:00"},{"alias_kind":"arxiv_version","alias_value":"hep-th/9612108v2","created_at":"2026-05-18T04:35:16.371431+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-th/9612108","created_at":"2026-05-18T04:35:16.371431+00:00"},{"alias_kind":"pith_short_12","alias_value":"R5FBB4ZDTEGV","created_at":"2026-05-18T12:25:48.327863+00:00"},{"alias_kind":"pith_short_16","alias_value":"R5FBB4ZDTEGVIWY7","created_at":"2026-05-18T12:25:48.327863+00:00"},{"alias_kind":"pith_short_8","alias_value":"R5FBB4ZD","created_at":"2026-05-18T12:25:48.327863+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/R5FBB4ZDTEGVIWY75B2KYRDCWA","json":"https://pith.science/pith/R5FBB4ZDTEGVIWY75B2KYRDCWA.json","graph_json":"https://pith.science/api/pith-number/R5FBB4ZDTEGVIWY75B2KYRDCWA/graph.json","events_json":"https://pith.science/api/pith-number/R5FBB4ZDTEGVIWY75B2KYRDCWA/events.json","paper":"https://pith.science/paper/R5FBB4ZD"},"agent_actions":{"view_html":"https://pith.science/pith/R5FBB4ZDTEGVIWY75B2KYRDCWA","download_json":"https://pith.science/pith/R5FBB4ZDTEGVIWY75B2KYRDCWA.json","view_paper":"https://pith.science/paper/R5FBB4ZD","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=hep-th/9612108&json=true","fetch_graph":"https://pith.science/api/pith-number/R5FBB4ZDTEGVIWY75B2KYRDCWA/graph.json","fetch_events":"https://pith.science/api/pith-number/R5FBB4ZDTEGVIWY75B2KYRDCWA/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/R5FBB4ZDTEGVIWY75B2KYRDCWA/action/timestamp_anchor","attest_storage":"https://pith.science/pith/R5FBB4ZDTEGVIWY75B2KYRDCWA/action/storage_attestation","attest_author":"https://pith.science/pith/R5FBB4ZDTEGVIWY75B2KYRDCWA/action/author_attestation","sign_citation":"https://pith.science/pith/R5FBB4ZDTEGVIWY75B2KYRDCWA/action/citation_signature","submit_replication":"https://pith.science/pith/R5FBB4ZDTEGVIWY75B2KYRDCWA/action/replication_record"}},"created_at":"2026-05-18T04:35:16.371431+00:00","updated_at":"2026-05-18T04:35:16.371431+00:00"}