{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:ZOPCS7M6FRQON2JJ3SMXILIZVN","short_pith_number":"pith:ZOPCS7M6","canonical_record":{"source":{"id":"2103.00389","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-02-28T03:41:02Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"814352d9ca550807fb9812498624069afcb3aee8e998b18da7c6550b2296f17e","abstract_canon_sha256":"9518c95f2b682c5e83528d8fb93df41353a78e1c42c5422c1759b320320eb859"},"schema_version":"1.0"},"canonical_sha256":"cb9e297d9e2c60e6e929dc99742d19ab63bc510c518b17ebed2da63898d24b1a","source":{"kind":"arxiv","id":"2103.00389","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.00389","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"arxiv_version","alias_value":"2103.00389v1","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.00389","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"pith_short_12","alias_value":"ZOPCS7M6FRQO","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"pith_short_16","alias_value":"ZOPCS7M6FRQON2JJ","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"pith_short_8","alias_value":"ZOPCS7M6","created_at":"2026-07-05T03:04:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:ZOPCS7M6FRQON2JJ3SMXILIZVN","target":"record","payload":{"canonical_record":{"source":{"id":"2103.00389","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-02-28T03:41:02Z","cross_cats_sorted":["quant-ph"],"title_canon_sha256":"814352d9ca550807fb9812498624069afcb3aee8e998b18da7c6550b2296f17e","abstract_canon_sha256":"9518c95f2b682c5e83528d8fb93df41353a78e1c42c5422c1759b320320eb859"},"schema_version":"1.0"},"canonical_sha256":"cb9e297d9e2c60e6e929dc99742d19ab63bc510c518b17ebed2da63898d24b1a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:04:46.673185Z","signature_b64":"9NdL7ylb0C+sSLCXnfjbXrNhWttu1AWm+7HAZXU6KUisojixW0pMBY1v7WQOqKjEt6NEjEH2ue2XDMWSfcHIDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cb9e297d9e2c60e6e929dc99742d19ab63bc510c518b17ebed2da63898d24b1a","last_reissued_at":"2026-07-05T03:04:46.672794Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:04:46.672794Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2103.00389","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":"2026-07-05T03:04:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aKS4vpoxe825tR2KA3qViljTjb47aAqF4eiC29l4HiEX65t1ammnlY72QFJuHWwGzeVT5GcjgiDfFZIHqQUtDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T21:13:15.188897Z"},"content_sha256":"4752292dbc81bc0ccd508e588f29876d75ebfec264951898d1097deb0f9e2010","schema_version":"1.0","event_id":"sha256:4752292dbc81bc0ccd508e588f29876d75ebfec264951898d1097deb0f9e2010"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:ZOPCS7M6FRQON2JJ3SMXILIZVN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Effect of symmetrical frequency chirp on pair production","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["quant-ph"],"primary_cat":"hep-ph","authors_text":"B. S. Xie, Kun Wang, Sayipjamal Dulat, Xuehua Hu","submitted_at":"2021-02-28T03:41:02Z","abstract_excerpt":"By using Dirac-Heisenberg-Wigner formalism we study electron-positron pair production for linear, elliptic, nearly circular and circular polarizations of electric fields with symmetrical frequency chirp, and we obtain Momentum spectra and pair yield. The difference of results among polarized fields is obvious for the small chirp. When the chirp parameter increases, the momentum spectra tend to exhibit the multiphoton pair generation that is characterized by the multi-concentric ring structure. The increase of number density is also remarkable compared to the case of asymmetrical frequency chir"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.00389","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2103.00389/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":"2026-07-05T03:04:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8/M6J5xERpyuh/3or8woqixnQ4/v5sBKd3qrxBSSBek0ubh++rMzXxlEjVES2qXp/K7GxSCxcQ6DJVkCqSrHBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-21T21:13:15.189255Z"},"content_sha256":"fdce8766926df59eba64414a7cef034f37b0d9989403ff4eca86440e5ff8c26e","schema_version":"1.0","event_id":"sha256:fdce8766926df59eba64414a7cef034f37b0d9989403ff4eca86440e5ff8c26e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/ZOPCS7M6FRQON2JJ3SMXILIZVN/bundle.json","state_url":"https://pith.science/pith/ZOPCS7M6FRQON2JJ3SMXILIZVN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/ZOPCS7M6FRQON2JJ3SMXILIZVN/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":"2026-07-21T21:13:15Z","links":{"resolver":"https://pith.science/pith/ZOPCS7M6FRQON2JJ3SMXILIZVN","bundle":"https://pith.science/pith/ZOPCS7M6FRQON2JJ3SMXILIZVN/bundle.json","state":"https://pith.science/pith/ZOPCS7M6FRQON2JJ3SMXILIZVN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/ZOPCS7M6FRQON2JJ3SMXILIZVN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:ZOPCS7M6FRQON2JJ3SMXILIZVN","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":"9518c95f2b682c5e83528d8fb93df41353a78e1c42c5422c1759b320320eb859","cross_cats_sorted":["quant-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-02-28T03:41:02Z","title_canon_sha256":"814352d9ca550807fb9812498624069afcb3aee8e998b18da7c6550b2296f17e"},"schema_version":"1.0","source":{"id":"2103.00389","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.00389","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"arxiv_version","alias_value":"2103.00389v1","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.00389","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"pith_short_12","alias_value":"ZOPCS7M6FRQO","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"pith_short_16","alias_value":"ZOPCS7M6FRQON2JJ","created_at":"2026-07-05T03:04:46Z"},{"alias_kind":"pith_short_8","alias_value":"ZOPCS7M6","created_at":"2026-07-05T03:04:46Z"}],"graph_snapshots":[{"event_id":"sha256:fdce8766926df59eba64414a7cef034f37b0d9989403ff4eca86440e5ff8c26e","target":"graph","created_at":"2026-07-05T03:04:46Z","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/2103.00389/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"By using Dirac-Heisenberg-Wigner formalism we study electron-positron pair production for linear, elliptic, nearly circular and circular polarizations of electric fields with symmetrical frequency chirp, and we obtain Momentum spectra and pair yield. The difference of results among polarized fields is obvious for the small chirp. When the chirp parameter increases, the momentum spectra tend to exhibit the multiphoton pair generation that is characterized by the multi-concentric ring structure. The increase of number density is also remarkable compared to the case of asymmetrical frequency chir","authors_text":"B. S. Xie, Kun Wang, Sayipjamal Dulat, Xuehua Hu","cross_cats":["quant-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-02-28T03:41:02Z","title":"Effect of symmetrical frequency chirp on pair production"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.00389","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":"sha256:4752292dbc81bc0ccd508e588f29876d75ebfec264951898d1097deb0f9e2010","target":"record","created_at":"2026-07-05T03:04:46Z","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":"9518c95f2b682c5e83528d8fb93df41353a78e1c42c5422c1759b320320eb859","cross_cats_sorted":["quant-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-02-28T03:41:02Z","title_canon_sha256":"814352d9ca550807fb9812498624069afcb3aee8e998b18da7c6550b2296f17e"},"schema_version":"1.0","source":{"id":"2103.00389","kind":"arxiv","version":1}},"canonical_sha256":"cb9e297d9e2c60e6e929dc99742d19ab63bc510c518b17ebed2da63898d24b1a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cb9e297d9e2c60e6e929dc99742d19ab63bc510c518b17ebed2da63898d24b1a","first_computed_at":"2026-07-05T03:04:46.672794Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:04:46.672794Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9NdL7ylb0C+sSLCXnfjbXrNhWttu1AWm+7HAZXU6KUisojixW0pMBY1v7WQOqKjEt6NEjEH2ue2XDMWSfcHIDg==","signature_status":"signed_v1","signed_at":"2026-07-05T03:04:46.673185Z","signed_message":"canonical_sha256_bytes"},"source_id":"2103.00389","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4752292dbc81bc0ccd508e588f29876d75ebfec264951898d1097deb0f9e2010","sha256:fdce8766926df59eba64414a7cef034f37b0d9989403ff4eca86440e5ff8c26e"],"state_sha256":"303f2c58c91142772bc03e6cd5488bc8ef8334eb58a4f7d3ec9ea4773af14d5d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pp/2dC3nAkIrPOkrDJ9/1Yuln4T4A3odkK867WWxYGGTtCCLIIDkgq2QIl5DGSBJTOTQMzJ/tuWIc1VaNvMMBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-21T21:13:15.191369Z","bundle_sha256":"1eb6f3975933ba4c914ec6f2ce98637e02a43a71d59eb2af7cbc63e2a8e60379"}}