{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:77BUODCZQX7CZ4OYBEZBWYYFCM","short_pith_number":"pith:77BUODCZ","canonical_record":{"source":{"id":"2607.17929","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-20T13:27:31Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"f9364bd3d096eea21ca0adb563a13f2569fbe23c316d3299894dbb5299742dea","abstract_canon_sha256":"1c4f92e83c3156efca53d0f241a0a7d44308247e8c94522bec8d1a6b6c2739f5"},"schema_version":"1.0"},"canonical_sha256":"ffc3470c5985fe2cf1d809321b6305131fe88f555b5f1380d66a09bc16a9a627","source":{"kind":"arxiv","id":"2607.17929","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.17929","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"arxiv_version","alias_value":"2607.17929v1","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.17929","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"pith_short_12","alias_value":"77BUODCZQX7C","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"pith_short_16","alias_value":"77BUODCZQX7CZ4OY","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"pith_short_8","alias_value":"77BUODCZ","created_at":"2026-07-21T02:22:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:77BUODCZQX7CZ4OYBEZBWYYFCM","target":"record","payload":{"canonical_record":{"source":{"id":"2607.17929","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-20T13:27:31Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"f9364bd3d096eea21ca0adb563a13f2569fbe23c316d3299894dbb5299742dea","abstract_canon_sha256":"1c4f92e83c3156efca53d0f241a0a7d44308247e8c94522bec8d1a6b6c2739f5"},"schema_version":"1.0"},"canonical_sha256":"ffc3470c5985fe2cf1d809321b6305131fe88f555b5f1380d66a09bc16a9a627","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-21T02:22:07.030163Z","signature_b64":"ePtqybABvx8C618aHd87qOqgM2/hzk+FjJPmnPgF+eiRKMHzpvmDH2DUKcRya8aR0fBmqk5RPWOpgX07A2BtCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ffc3470c5985fe2cf1d809321b6305131fe88f555b5f1380d66a09bc16a9a627","last_reissued_at":"2026-07-21T02:22:07.029300Z","signature_status":"signed_v1","first_computed_at":"2026-07-21T02:22:07.029300Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.17929","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":"2026-07-21T02:22:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6cxgLeEQ5EUZP3PQq7fgZ/K0WJ+i5Hj3j+xccT8v0GVQdcJquJtXmV723nNjrCdcdnkpotWov1cO4hIMWLNiCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T20:10:51.591353Z"},"content_sha256":"bb84d43babb369362d693f4a70b9e72bbe475a5eb2a0c12b7a80473728953e52","schema_version":"1.0","event_id":"sha256:bb84d43babb369362d693f4a70b9e72bbe475a5eb2a0c12b7a80473728953e52"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:77BUODCZQX7CZ4OYBEZBWYYFCM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"gevolution 2.0: GPU-accelerated relativistic N-body simulations for cosmology","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Julian Adamek, {\\O}yvind Christiansen","submitted_at":"2026-07-20T13:27:31Z","abstract_excerpt":"High-performance computing is increasingly dominated by hardware acceleration using Graphics Processing Units (GPUs). To take advantage of this long-term trend, we implement a major overhaul of the parallelisation approach in the relativistic particle-mesh N-body code gevolution. The new version 2.0 of gevolution employs three layers of parallelisation: MPI for scalability on a distributed memory system, shared memory parallelisation on each MPI rank using OpenMP, and offloading all compute intensive tasks to GPUs using CUDA. The code also includes many new features that have been developed ov"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.17929","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/2607.17929/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":"2026-07-21T02:22:07Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QBEkrBLSGhf0CwLk7E8Jcz8y+wP3MOopA+LP8mk+O1NhCPYYs1gHvzwLN9f5eq6E8zsJCbM57ESGXTBwOu9GDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T20:10:51.591740Z"},"content_sha256":"6435fd4cd1938365f51927ba22c359ba85d7991225cd52b204299b1355a04456","schema_version":"1.0","event_id":"sha256:6435fd4cd1938365f51927ba22c359ba85d7991225cd52b204299b1355a04456"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/77BUODCZQX7CZ4OYBEZBWYYFCM/bundle.json","state_url":"https://pith.science/pith/77BUODCZQX7CZ4OYBEZBWYYFCM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/77BUODCZQX7CZ4OYBEZBWYYFCM/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":"2026-08-02T20:10:51Z","links":{"resolver":"https://pith.science/pith/77BUODCZQX7CZ4OYBEZBWYYFCM","bundle":"https://pith.science/pith/77BUODCZQX7CZ4OYBEZBWYYFCM/bundle.json","state":"https://pith.science/pith/77BUODCZQX7CZ4OYBEZBWYYFCM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/77BUODCZQX7CZ4OYBEZBWYYFCM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:77BUODCZQX7CZ4OYBEZBWYYFCM","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":"1c4f92e83c3156efca53d0f241a0a7d44308247e8c94522bec8d1a6b6c2739f5","cross_cats_sorted":["astro-ph.CO"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-20T13:27:31Z","title_canon_sha256":"f9364bd3d096eea21ca0adb563a13f2569fbe23c316d3299894dbb5299742dea"},"schema_version":"1.0","source":{"id":"2607.17929","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.17929","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"arxiv_version","alias_value":"2607.17929v1","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.17929","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"pith_short_12","alias_value":"77BUODCZQX7C","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"pith_short_16","alias_value":"77BUODCZQX7CZ4OY","created_at":"2026-07-21T02:22:07Z"},{"alias_kind":"pith_short_8","alias_value":"77BUODCZ","created_at":"2026-07-21T02:22:07Z"}],"graph_snapshots":[{"event_id":"sha256:6435fd4cd1938365f51927ba22c359ba85d7991225cd52b204299b1355a04456","target":"graph","created_at":"2026-07-21T02:22:07Z","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/2607.17929/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"High-performance computing is increasingly dominated by hardware acceleration using Graphics Processing Units (GPUs). To take advantage of this long-term trend, we implement a major overhaul of the parallelisation approach in the relativistic particle-mesh N-body code gevolution. The new version 2.0 of gevolution employs three layers of parallelisation: MPI for scalability on a distributed memory system, shared memory parallelisation on each MPI rank using OpenMP, and offloading all compute intensive tasks to GPUs using CUDA. The code also includes many new features that have been developed ov","authors_text":"Julian Adamek, {\\O}yvind Christiansen","cross_cats":["astro-ph.CO"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-20T13:27:31Z","title":"gevolution 2.0: GPU-accelerated relativistic N-body simulations for cosmology"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.17929","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:bb84d43babb369362d693f4a70b9e72bbe475a5eb2a0c12b7a80473728953e52","target":"record","created_at":"2026-07-21T02:22:07Z","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":"1c4f92e83c3156efca53d0f241a0a7d44308247e8c94522bec8d1a6b6c2739f5","cross_cats_sorted":["astro-ph.CO"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2026-07-20T13:27:31Z","title_canon_sha256":"f9364bd3d096eea21ca0adb563a13f2569fbe23c316d3299894dbb5299742dea"},"schema_version":"1.0","source":{"id":"2607.17929","kind":"arxiv","version":1}},"canonical_sha256":"ffc3470c5985fe2cf1d809321b6305131fe88f555b5f1380d66a09bc16a9a627","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ffc3470c5985fe2cf1d809321b6305131fe88f555b5f1380d66a09bc16a9a627","first_computed_at":"2026-07-21T02:22:07.029300Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-21T02:22:07.029300Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ePtqybABvx8C618aHd87qOqgM2/hzk+FjJPmnPgF+eiRKMHzpvmDH2DUKcRya8aR0fBmqk5RPWOpgX07A2BtCg==","signature_status":"signed_v1","signed_at":"2026-07-21T02:22:07.030163Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.17929","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bb84d43babb369362d693f4a70b9e72bbe475a5eb2a0c12b7a80473728953e52","sha256:6435fd4cd1938365f51927ba22c359ba85d7991225cd52b204299b1355a04456"],"state_sha256":"b92505b74f855dc4ee62caecfad599611074147ecbcfdc90731667aee9b8a80b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F2UoqM6DUkZAvDlpzgC2zvIwiHD7wHtp9GALjRxlCqJ3r7CFuK2XycKH7wpdKen5BfvFbsIT4aKKJ0C4JFf8Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-02T20:10:51.594547Z","bundle_sha256":"d71a31498d72b5971c9ebec7c9bffd4d91d7f74f13fdebbeb12fad4dd93c3a85"}}