{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:XH22HWF3CZT4V55PNO6HRRWVFW","short_pith_number":"pith:XH22HWF3","canonical_record":{"source":{"id":"2002.08494","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-02-19T23:20:14Z","cross_cats_sorted":["physics.acc-ph","physics.plasm-ph"],"title_canon_sha256":"5a8e46e9a0b930cc3fb2c3a9926ef532f15ad07a4cac90cbda691bbbd0a562d3","abstract_canon_sha256":"34f6b858843ad3f409e2b47705d5082b2824046f8b9149d1ac961bba38d749e7"},"schema_version":"1.0"},"canonical_sha256":"b9f5a3d8bb1667caf7af6bbc78c6d52d892b55bb11171c7cc467c12f58e4beb9","source":{"kind":"arxiv","id":"2002.08494","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.08494","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"arxiv_version","alias_value":"2002.08494v1","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.08494","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"pith_short_12","alias_value":"XH22HWF3CZT4","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"pith_short_16","alias_value":"XH22HWF3CZT4V55P","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"pith_short_8","alias_value":"XH22HWF3","created_at":"2026-07-05T02:11:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:XH22HWF3CZT4V55PNO6HRRWVFW","target":"record","payload":{"canonical_record":{"source":{"id":"2002.08494","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-02-19T23:20:14Z","cross_cats_sorted":["physics.acc-ph","physics.plasm-ph"],"title_canon_sha256":"5a8e46e9a0b930cc3fb2c3a9926ef532f15ad07a4cac90cbda691bbbd0a562d3","abstract_canon_sha256":"34f6b858843ad3f409e2b47705d5082b2824046f8b9149d1ac961bba38d749e7"},"schema_version":"1.0"},"canonical_sha256":"b9f5a3d8bb1667caf7af6bbc78c6d52d892b55bb11171c7cc467c12f58e4beb9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:11:43.885669Z","signature_b64":"OUoHNrhpl35VpsplIxAiWvnT1y++Q+lZuAVudx8UlJfDhI4F6us5AG+1Ps2y06Di4PBDVWUgZkffyxxYclmTBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b9f5a3d8bb1667caf7af6bbc78c6d52d892b55bb11171c7cc467c12f58e4beb9","last_reissued_at":"2026-07-05T02:11:43.885195Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:11:43.885195Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2002.08494","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":"2026-07-05T02:11:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"O+JI9rKc1/FtdCfvFoSkLw9MF7uoVROSt9ywSquQowbJZ95z8mZiC4OACbgyiMNz2caTnVZZO4fXVVa7OahnDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T00:31:23.353062Z"},"content_sha256":"ba1ab758a782c1f2ffd46c196413747f8fdb6ea44a6aabf98ba80bc1cfbf5d9d","schema_version":"1.0","event_id":"sha256:ba1ab758a782c1f2ffd46c196413747f8fdb6ea44a6aabf98ba80bc1cfbf5d9d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:XH22HWF3CZT4V55PNO6HRRWVFW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A quasi-static particle-in-cell algorithm based on an azimuthal Fourier decomposition for highly efficient simulations of plasma-based acceleration: QPAD","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.acc-ph","physics.plasm-ph"],"primary_cat":"physics.comp-ph","authors_text":"Fei Li, Mark J. Hogan, Viktor K. Decyk, Warren B. Mori, Weiming An, Xinlu Xu","submitted_at":"2020-02-19T23:20:14Z","abstract_excerpt":"The 3D quasi-static particle-in-cell (PIC) algorithm is a very efficient method for modeling short-pulse laser or relativistic charged particle beam-plasma interactions. In this algorithm, the plasma response to a non-evolving laser or particle beam is calculated using Maxwell's equations based on the quasi-static approximate equations that exclude radiation. The plasma fields are then used to advance the laser or beam forward using a large time step. The algorithm is many orders of magnitude faster than a 3D fully explicit relativistic electromagnetic PIC algorithm. It has been shown to be ca"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.08494","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/2002.08494/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":"2026-07-05T02:11:43Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JWgebJlXmsiyw30fjuNGvAMuKBoZMFxu4ytNkRU06KhVwE3t7EZ1PVW8qVRQXF/pN/E1McnzZ7C1tt+FFajXCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T00:31:23.353591Z"},"content_sha256":"5f54d206db0a71c78cd2a5119a67e9a36115262a8cfb6a4f7cbcb9205f0e2228","schema_version":"1.0","event_id":"sha256:5f54d206db0a71c78cd2a5119a67e9a36115262a8cfb6a4f7cbcb9205f0e2228"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XH22HWF3CZT4V55PNO6HRRWVFW/bundle.json","state_url":"https://pith.science/pith/XH22HWF3CZT4V55PNO6HRRWVFW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XH22HWF3CZT4V55PNO6HRRWVFW/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":"2026-08-16T00:31:23Z","links":{"resolver":"https://pith.science/pith/XH22HWF3CZT4V55PNO6HRRWVFW","bundle":"https://pith.science/pith/XH22HWF3CZT4V55PNO6HRRWVFW/bundle.json","state":"https://pith.science/pith/XH22HWF3CZT4V55PNO6HRRWVFW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XH22HWF3CZT4V55PNO6HRRWVFW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:XH22HWF3CZT4V55PNO6HRRWVFW","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":"34f6b858843ad3f409e2b47705d5082b2824046f8b9149d1ac961bba38d749e7","cross_cats_sorted":["physics.acc-ph","physics.plasm-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-02-19T23:20:14Z","title_canon_sha256":"5a8e46e9a0b930cc3fb2c3a9926ef532f15ad07a4cac90cbda691bbbd0a562d3"},"schema_version":"1.0","source":{"id":"2002.08494","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2002.08494","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"arxiv_version","alias_value":"2002.08494v1","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2002.08494","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"pith_short_12","alias_value":"XH22HWF3CZT4","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"pith_short_16","alias_value":"XH22HWF3CZT4V55P","created_at":"2026-07-05T02:11:43Z"},{"alias_kind":"pith_short_8","alias_value":"XH22HWF3","created_at":"2026-07-05T02:11:43Z"}],"graph_snapshots":[{"event_id":"sha256:5f54d206db0a71c78cd2a5119a67e9a36115262a8cfb6a4f7cbcb9205f0e2228","target":"graph","created_at":"2026-07-05T02:11:43Z","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/2002.08494/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The 3D quasi-static particle-in-cell (PIC) algorithm is a very efficient method for modeling short-pulse laser or relativistic charged particle beam-plasma interactions. In this algorithm, the plasma response to a non-evolving laser or particle beam is calculated using Maxwell's equations based on the quasi-static approximate equations that exclude radiation. The plasma fields are then used to advance the laser or beam forward using a large time step. The algorithm is many orders of magnitude faster than a 3D fully explicit relativistic electromagnetic PIC algorithm. It has been shown to be ca","authors_text":"Fei Li, Mark J. Hogan, Viktor K. Decyk, Warren B. Mori, Weiming An, Xinlu Xu","cross_cats":["physics.acc-ph","physics.plasm-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-02-19T23:20:14Z","title":"A quasi-static particle-in-cell algorithm based on an azimuthal Fourier decomposition for highly efficient simulations of plasma-based acceleration: QPAD"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2002.08494","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:ba1ab758a782c1f2ffd46c196413747f8fdb6ea44a6aabf98ba80bc1cfbf5d9d","target":"record","created_at":"2026-07-05T02:11:43Z","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":"34f6b858843ad3f409e2b47705d5082b2824046f8b9149d1ac961bba38d749e7","cross_cats_sorted":["physics.acc-ph","physics.plasm-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.comp-ph","submitted_at":"2020-02-19T23:20:14Z","title_canon_sha256":"5a8e46e9a0b930cc3fb2c3a9926ef532f15ad07a4cac90cbda691bbbd0a562d3"},"schema_version":"1.0","source":{"id":"2002.08494","kind":"arxiv","version":1}},"canonical_sha256":"b9f5a3d8bb1667caf7af6bbc78c6d52d892b55bb11171c7cc467c12f58e4beb9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b9f5a3d8bb1667caf7af6bbc78c6d52d892b55bb11171c7cc467c12f58e4beb9","first_computed_at":"2026-07-05T02:11:43.885195Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:11:43.885195Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"OUoHNrhpl35VpsplIxAiWvnT1y++Q+lZuAVudx8UlJfDhI4F6us5AG+1Ps2y06Di4PBDVWUgZkffyxxYclmTBw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:11:43.885669Z","signed_message":"canonical_sha256_bytes"},"source_id":"2002.08494","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ba1ab758a782c1f2ffd46c196413747f8fdb6ea44a6aabf98ba80bc1cfbf5d9d","sha256:5f54d206db0a71c78cd2a5119a67e9a36115262a8cfb6a4f7cbcb9205f0e2228"],"state_sha256":"325b2577f479bf81e658369c67e89a4c01b260b0801f03fe898c1b4a2d74e6b3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ixh9IOZBkZlaf435bUzvcj7ACKMyJ7kQyVBpuKaWdd61YHVeXJlBE/UY6aUG/9Zuy2ZC4BtWcXOPy2q6Td0XDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T00:31:23.357659Z","bundle_sha256":"5263bb3a33a53dcbee6d02e1170720035edb58d414e7540566786ebaeb39deef"}}