{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:1998:UONK5M4FCE6MHPKCDOYWUCB74T","short_pith_number":"pith:UONK5M4F","canonical_record":{"source":{"id":"hep-ph/9805214","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1998-05-04T16:13:33Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"d058f5e42306f9ff2bbc95ea336aafcb609576af8e985823665eb957272170be","abstract_canon_sha256":"9ca8ff915ebde544400e681089e06c04db4bc9032a6d90bbb6411e104ce8b192"},"schema_version":"1.0"},"canonical_sha256":"a39aaeb385113cc3bd421bb16a083fe4ce8f2b6c823ec38b0b569fc6f4c8d1f3","source":{"kind":"arxiv","id":"hep-ph/9805214","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/9805214","created_at":"2026-05-18T01:06:08Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/9805214v2","created_at":"2026-05-18T01:06:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/9805214","created_at":"2026-05-18T01:06:08Z"},{"alias_kind":"pith_short_12","alias_value":"UONK5M4FCE6M","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"UONK5M4FCE6MHPKC","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"UONK5M4F","created_at":"2026-05-18T12:25:49Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:1998:UONK5M4FCE6MHPKCDOYWUCB74T","target":"record","payload":{"canonical_record":{"source":{"id":"hep-ph/9805214","kind":"arxiv","version":2},"metadata":{"license":"","primary_cat":"hep-ph","submitted_at":"1998-05-04T16:13:33Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"d058f5e42306f9ff2bbc95ea336aafcb609576af8e985823665eb957272170be","abstract_canon_sha256":"9ca8ff915ebde544400e681089e06c04db4bc9032a6d90bbb6411e104ce8b192"},"schema_version":"1.0"},"canonical_sha256":"a39aaeb385113cc3bd421bb16a083fe4ce8f2b6c823ec38b0b569fc6f4c8d1f3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:06:08.032797Z","signature_b64":"MuUs1m502o6rq5iRk5go4L0a0BpX2iVXrO5Ye+wpOPvWoPU48YriHdZfEsGSjyRvz6PHEbxJjrqqV73AWNQsAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a39aaeb385113cc3bd421bb16a083fe4ce8f2b6c823ec38b0b569fc6f4c8d1f3","last_reissued_at":"2026-05-18T01:06:08.032116Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:06:08.032116Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"hep-ph/9805214","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":"2026-05-18T01:06:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eBJZop+/hm0wZWGlBw71BhELps3k0VyGmkjwCtpGGyun5iQ/CeHbb/f5XGMNkvkeXyj7LkL5eZoM7noGqAw6AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:12:23.796528Z"},"content_sha256":"8eb29b1965321b90956cd5ad41cc509e84e6afa7ade4f561eff17e7a64b4cab4","schema_version":"1.0","event_id":"sha256:8eb29b1965321b90956cd5ad41cc509e84e6afa7ade4f561eff17e7a64b4cab4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:1998:UONK5M4FCE6MHPKCDOYWUCB74T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"QCD at \\theta \\sim \\pi","license":"","headline":"","cross_cats":["hep-th"],"primary_cat":"hep-ph","authors_text":"A.V. Smilga","submitted_at":"1998-05-04T16:13:33Z","abstract_excerpt":"Taking into account the quadratic in mass terms in the effective chiral lagrangian, we show that, at \\theta \\sim \\pi, the theory with 2 light quarks of equal mass involves two degenerate vacuum states separated by a barrier. For three flavors, the energy barrier between two vacua appears already in the leading order in mass. This corresponds to the first order phase transition at \\theta = \\pi. The surface energy density of the domain wall separating two different vacua is calculated. In the immediate vicinity of the phase transition point, two minima of the potential still exist, but one of th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9805214","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:06:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nOw49C+p+4z7st14Mn9zeNg0AEUyGNz4k7wlpFUCFmYbnqyDXMR+KYyOV6E+WA6cPs5hUUZh3Hx8Z/wvwfMdCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T23:12:23.797236Z"},"content_sha256":"597cbd14a9eaf512fddee89bac947e6632da0908b9ffcafc16034408a04fe004","schema_version":"1.0","event_id":"sha256:597cbd14a9eaf512fddee89bac947e6632da0908b9ffcafc16034408a04fe004"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UONK5M4FCE6MHPKCDOYWUCB74T/bundle.json","state_url":"https://pith.science/pith/UONK5M4FCE6MHPKCDOYWUCB74T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UONK5M4FCE6MHPKCDOYWUCB74T/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":"2026-05-25T23:12:23Z","links":{"resolver":"https://pith.science/pith/UONK5M4FCE6MHPKCDOYWUCB74T","bundle":"https://pith.science/pith/UONK5M4FCE6MHPKCDOYWUCB74T/bundle.json","state":"https://pith.science/pith/UONK5M4FCE6MHPKCDOYWUCB74T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UONK5M4FCE6MHPKCDOYWUCB74T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:1998:UONK5M4FCE6MHPKCDOYWUCB74T","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":"9ca8ff915ebde544400e681089e06c04db4bc9032a6d90bbb6411e104ce8b192","cross_cats_sorted":["hep-th"],"license":"","primary_cat":"hep-ph","submitted_at":"1998-05-04T16:13:33Z","title_canon_sha256":"d058f5e42306f9ff2bbc95ea336aafcb609576af8e985823665eb957272170be"},"schema_version":"1.0","source":{"id":"hep-ph/9805214","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"hep-ph/9805214","created_at":"2026-05-18T01:06:08Z"},{"alias_kind":"arxiv_version","alias_value":"hep-ph/9805214v2","created_at":"2026-05-18T01:06:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.hep-ph/9805214","created_at":"2026-05-18T01:06:08Z"},{"alias_kind":"pith_short_12","alias_value":"UONK5M4FCE6M","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_16","alias_value":"UONK5M4FCE6MHPKC","created_at":"2026-05-18T12:25:49Z"},{"alias_kind":"pith_short_8","alias_value":"UONK5M4F","created_at":"2026-05-18T12:25:49Z"}],"graph_snapshots":[{"event_id":"sha256:597cbd14a9eaf512fddee89bac947e6632da0908b9ffcafc16034408a04fe004","target":"graph","created_at":"2026-05-18T01:06:08Z","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":"Taking into account the quadratic in mass terms in the effective chiral lagrangian, we show that, at \\theta \\sim \\pi, the theory with 2 light quarks of equal mass involves two degenerate vacuum states separated by a barrier. For three flavors, the energy barrier between two vacua appears already in the leading order in mass. This corresponds to the first order phase transition at \\theta = \\pi. The surface energy density of the domain wall separating two different vacua is calculated. In the immediate vicinity of the phase transition point, two minima of the potential still exist, but one of th","authors_text":"A.V. Smilga","cross_cats":["hep-th"],"headline":"","license":"","primary_cat":"hep-ph","submitted_at":"1998-05-04T16:13:33Z","title":"QCD at \\theta \\sim \\pi"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"hep-ph/9805214","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":"sha256:8eb29b1965321b90956cd5ad41cc509e84e6afa7ade4f561eff17e7a64b4cab4","target":"record","created_at":"2026-05-18T01:06:08Z","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":"9ca8ff915ebde544400e681089e06c04db4bc9032a6d90bbb6411e104ce8b192","cross_cats_sorted":["hep-th"],"license":"","primary_cat":"hep-ph","submitted_at":"1998-05-04T16:13:33Z","title_canon_sha256":"d058f5e42306f9ff2bbc95ea336aafcb609576af8e985823665eb957272170be"},"schema_version":"1.0","source":{"id":"hep-ph/9805214","kind":"arxiv","version":2}},"canonical_sha256":"a39aaeb385113cc3bd421bb16a083fe4ce8f2b6c823ec38b0b569fc6f4c8d1f3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a39aaeb385113cc3bd421bb16a083fe4ce8f2b6c823ec38b0b569fc6f4c8d1f3","first_computed_at":"2026-05-18T01:06:08.032116Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:06:08.032116Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"MuUs1m502o6rq5iRk5go4L0a0BpX2iVXrO5Ye+wpOPvWoPU48YriHdZfEsGSjyRvz6PHEbxJjrqqV73AWNQsAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:06:08.032797Z","signed_message":"canonical_sha256_bytes"},"source_id":"hep-ph/9805214","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8eb29b1965321b90956cd5ad41cc509e84e6afa7ade4f561eff17e7a64b4cab4","sha256:597cbd14a9eaf512fddee89bac947e6632da0908b9ffcafc16034408a04fe004"],"state_sha256":"6250f1c94f85fa604855d1d16e654d4666e5fd69ca799e553cd45cd5160a5f25"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z7WQSmeEeLIXnXvEl0aHJgCJFFM7aLcgejSLXioyO8IwzBcGzKcwakuatmjQCy1vQMS9M4NZ7piBOMFPT4c0DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T23:12:23.801462Z","bundle_sha256":"d078edea01eadf88e9071dd5edddb88c6c8cec067ac966a1c8df057e70baeb0d"}}