{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:E5HSX4Z5RKM6WESVN7UKNZF6XJ","short_pith_number":"pith:E5HSX4Z5","canonical_record":{"source":{"id":"1912.11015","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-12-23T18:16:23Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"a2aa64ca997ed53f256705dc335dc1a6e9f806af22130965f34ac357a7cfa79d","abstract_canon_sha256":"f6ac9a5ab3c8b5d010459e6613c1bc59fc81597d94f99bb6f13b3fa41858acab"},"schema_version":"1.0"},"canonical_sha256":"274f2bf33d8a99eb12556fe8a6e4beba5b79a230a2a22198c53a9acff017bedb","source":{"kind":"arxiv","id":"1912.11015","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.11015","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"arxiv_version","alias_value":"1912.11015v2","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.11015","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"pith_short_12","alias_value":"E5HSX4Z5RKM6","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"pith_short_16","alias_value":"E5HSX4Z5RKM6WESV","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"pith_short_8","alias_value":"E5HSX4Z5","created_at":"2026-07-05T01:24:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:E5HSX4Z5RKM6WESVN7UKNZF6XJ","target":"record","payload":{"canonical_record":{"source":{"id":"1912.11015","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-12-23T18:16:23Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"a2aa64ca997ed53f256705dc335dc1a6e9f806af22130965f34ac357a7cfa79d","abstract_canon_sha256":"f6ac9a5ab3c8b5d010459e6613c1bc59fc81597d94f99bb6f13b3fa41858acab"},"schema_version":"1.0"},"canonical_sha256":"274f2bf33d8a99eb12556fe8a6e4beba5b79a230a2a22198c53a9acff017bedb","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:24:29.941488Z","signature_b64":"kRFiv3rP7CWlFnzQfvlV3rV57D9JI5FumZhpe1KZVSsvdh36/UDFB7J1p4L7TrV1Qcgdi2K8aH+lOtXvQWdDBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"274f2bf33d8a99eb12556fe8a6e4beba5b79a230a2a22198c53a9acff017bedb","last_reissued_at":"2026-07-05T01:24:29.940899Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:24:29.940899Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1912.11015","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":"2026-07-05T01:24:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"owz5pabvxozajL0EM+q/YNY7io6AB995hO+kiABk/1r3Zgbkp5/DK6gsjfuyScI0P54te3dOiZ5OtVtGL57/BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T08:01:38.058844Z"},"content_sha256":"aa8e216ed44009587e4d7cdebb8e10c273ef9c8be2d3a4bb4efd0e5255edcd47","schema_version":"1.0","event_id":"sha256:aa8e216ed44009587e4d7cdebb8e10c273ef9c8be2d3a4bb4efd0e5255edcd47"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:E5HSX4Z5RKM6WESVN7UKNZF6XJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Approximating higher-order nonlinear QED processes with first-order building blocks","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"hep-ph","authors_text":"Greger Torgrimsson, Victor Dinu","submitted_at":"2019-12-23T18:16:23Z","abstract_excerpt":"Higher-order tree-level processes in strong laser fields, i.e. cascades, are in general extremely difficult to calculate, but in some regimes the dominant contribution comes from a sequence of first-order processes, i.e. nonlinear Compton scattering and nonlinear Breit-Wheeler pair production. At high intensity the field can be treated as locally constant, which is the basis for standard particle-in-cell codes. However, the locally-constant-field (LCF) approximation and these particle-in-cell codes cannot be used when the intensity is only moderately high, which is a regime that is experimenta"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.11015","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1912.11015/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":"2026-07-05T01:24:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2Yn7akGrG8PxxABo50Y2Iu0huZyVLh0Mv9dnKZBfLSV38FQALzpbb9oy28fVomTcL2ld51uwsl6KsLfzuWVQAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T08:01:38.059341Z"},"content_sha256":"f4ea8465ed1fd26907bed454bc543027955e6d954120609a027e6e3081824283","schema_version":"1.0","event_id":"sha256:f4ea8465ed1fd26907bed454bc543027955e6d954120609a027e6e3081824283"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/E5HSX4Z5RKM6WESVN7UKNZF6XJ/bundle.json","state_url":"https://pith.science/pith/E5HSX4Z5RKM6WESVN7UKNZF6XJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/E5HSX4Z5RKM6WESVN7UKNZF6XJ/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":"2026-08-12T08:01:38Z","links":{"resolver":"https://pith.science/pith/E5HSX4Z5RKM6WESVN7UKNZF6XJ","bundle":"https://pith.science/pith/E5HSX4Z5RKM6WESVN7UKNZF6XJ/bundle.json","state":"https://pith.science/pith/E5HSX4Z5RKM6WESVN7UKNZF6XJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/E5HSX4Z5RKM6WESVN7UKNZF6XJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:E5HSX4Z5RKM6WESVN7UKNZF6XJ","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":"f6ac9a5ab3c8b5d010459e6613c1bc59fc81597d94f99bb6f13b3fa41858acab","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-12-23T18:16:23Z","title_canon_sha256":"a2aa64ca997ed53f256705dc335dc1a6e9f806af22130965f34ac357a7cfa79d"},"schema_version":"1.0","source":{"id":"1912.11015","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1912.11015","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"arxiv_version","alias_value":"1912.11015v2","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1912.11015","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"pith_short_12","alias_value":"E5HSX4Z5RKM6","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"pith_short_16","alias_value":"E5HSX4Z5RKM6WESV","created_at":"2026-07-05T01:24:29Z"},{"alias_kind":"pith_short_8","alias_value":"E5HSX4Z5","created_at":"2026-07-05T01:24:29Z"}],"graph_snapshots":[{"event_id":"sha256:f4ea8465ed1fd26907bed454bc543027955e6d954120609a027e6e3081824283","target":"graph","created_at":"2026-07-05T01:24:29Z","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/1912.11015/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Higher-order tree-level processes in strong laser fields, i.e. cascades, are in general extremely difficult to calculate, but in some regimes the dominant contribution comes from a sequence of first-order processes, i.e. nonlinear Compton scattering and nonlinear Breit-Wheeler pair production. At high intensity the field can be treated as locally constant, which is the basis for standard particle-in-cell codes. However, the locally-constant-field (LCF) approximation and these particle-in-cell codes cannot be used when the intensity is only moderately high, which is a regime that is experimenta","authors_text":"Greger Torgrimsson, Victor Dinu","cross_cats":["hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-12-23T18:16:23Z","title":"Approximating higher-order nonlinear QED processes with first-order building blocks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1912.11015","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:aa8e216ed44009587e4d7cdebb8e10c273ef9c8be2d3a4bb4efd0e5255edcd47","target":"record","created_at":"2026-07-05T01:24:29Z","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":"f6ac9a5ab3c8b5d010459e6613c1bc59fc81597d94f99bb6f13b3fa41858acab","cross_cats_sorted":["hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-ph","submitted_at":"2019-12-23T18:16:23Z","title_canon_sha256":"a2aa64ca997ed53f256705dc335dc1a6e9f806af22130965f34ac357a7cfa79d"},"schema_version":"1.0","source":{"id":"1912.11015","kind":"arxiv","version":2}},"canonical_sha256":"274f2bf33d8a99eb12556fe8a6e4beba5b79a230a2a22198c53a9acff017bedb","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"274f2bf33d8a99eb12556fe8a6e4beba5b79a230a2a22198c53a9acff017bedb","first_computed_at":"2026-07-05T01:24:29.940899Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:24:29.940899Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kRFiv3rP7CWlFnzQfvlV3rV57D9JI5FumZhpe1KZVSsvdh36/UDFB7J1p4L7TrV1Qcgdi2K8aH+lOtXvQWdDBw==","signature_status":"signed_v1","signed_at":"2026-07-05T01:24:29.941488Z","signed_message":"canonical_sha256_bytes"},"source_id":"1912.11015","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aa8e216ed44009587e4d7cdebb8e10c273ef9c8be2d3a4bb4efd0e5255edcd47","sha256:f4ea8465ed1fd26907bed454bc543027955e6d954120609a027e6e3081824283"],"state_sha256":"dfea346e05b6f2077126fece1642d16c3065340f0e5fdc205cb47442b4b7b8d7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Foy9OB2G5Ck30pt9XM9/GFqL0xvv6w5/dmqOt+nXK2FddDaTZVqjRSPy27qjXjBopfe/jl+zqvy36VoWWNFXCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-12T08:01:38.064699Z","bundle_sha256":"a333bf6e128b284c94ca187f196fddde651a4d29a8eaff42e3425b29b90f17b1"}}