{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:D2RF34U7ZPCHD7LGSORIJKV55X","short_pith_number":"pith:D2RF34U7","canonical_record":{"source":{"id":"1811.05903","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-11-14T16:56:27Z","cross_cats_sorted":[],"title_canon_sha256":"28e13299db070219125313d36d5e4455d923c6773ba60d69cec3886659b7b5a1","abstract_canon_sha256":"ba6613cffa89e0d8225abfee4b0559868a8e840cffd7b806db1928ca4dc9018a"},"schema_version":"1.0"},"canonical_sha256":"1ea25df29fcbc471fd6693a284aabdedf9a4a519bf5d2fa769fd43888d04891a","source":{"kind":"arxiv","id":"1811.05903","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.05903","created_at":"2026-05-17T23:50:44Z"},{"alias_kind":"arxiv_version","alias_value":"1811.05903v3","created_at":"2026-05-17T23:50:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.05903","created_at":"2026-05-17T23:50:44Z"},{"alias_kind":"pith_short_12","alias_value":"D2RF34U7ZPCH","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"D2RF34U7ZPCHD7LG","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"D2RF34U7","created_at":"2026-05-18T12:32:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:D2RF34U7ZPCHD7LGSORIJKV55X","target":"record","payload":{"canonical_record":{"source":{"id":"1811.05903","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-11-14T16:56:27Z","cross_cats_sorted":[],"title_canon_sha256":"28e13299db070219125313d36d5e4455d923c6773ba60d69cec3886659b7b5a1","abstract_canon_sha256":"ba6613cffa89e0d8225abfee4b0559868a8e840cffd7b806db1928ca4dc9018a"},"schema_version":"1.0"},"canonical_sha256":"1ea25df29fcbc471fd6693a284aabdedf9a4a519bf5d2fa769fd43888d04891a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:44.791867Z","signature_b64":"/sjsUsAYmv3oA0XzpBJ7iNmkwmVdlEksUwr1tr3Mm4baTSrJsLFvYDqAaVHvFzNeVgjzYoFX3saYR5fFpK+wBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1ea25df29fcbc471fd6693a284aabdedf9a4a519bf5d2fa769fd43888d04891a","last_reissued_at":"2026-05-17T23:50:44.791435Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:44.791435Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1811.05903","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:50:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MIKlRGnMcvfc6wXp9OcLmuNup12HhBTBalV243QV6RQ0v5ps136mOA3nMNw6oH3T8kMKnN17yKuSr9/1VuRrCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T12:27:01.858517Z"},"content_sha256":"6f86cd1fdd1b92e80025d0fe4400347a1e0b07fdfff275dc9113cac871b10dcd","schema_version":"1.0","event_id":"sha256:6f86cd1fdd1b92e80025d0fe4400347a1e0b07fdfff275dc9113cac871b10dcd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:D2RF34U7ZPCHD7LGSORIJKV55X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"StePS: A Multi-GPU Cosmological N-body Code for Compactified Simulations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Alexander S. Szalay, G\\'abor R\\'acz, Istv\\'an Csabai, Istv\\'an Szapudi, L\\'aszl\\'o Dobos","submitted_at":"2018-11-14T16:56:27Z","abstract_excerpt":"We present the multi-GPU realization of the StePS (Stereographically Projected Cosmological Simulations) algorithm with MPI-OpenMP-CUDA hybrid parallelization and nearly ideal scale-out to multiple compute nodes. Our new zoom-in cosmological direct N-body simulation method simulates the infinite universe with unprecedented dynamic range for a given amount of memory and, in contrast to traditional periodic simulations, its fundamental geometry and topology match observations. By using a spherical geometry instead of periodic boundary conditions, and gradually decreasing the mass resolution with"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.05903","kind":"arxiv","version":3},"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":"2026-05-17T23:50:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yjQU8eQ/3o0rlFNfQ6v6g52FXBwsyGyw1bJ+3jULgb+c3HqBxv90RpzkSRrfMQsYqVnQpo9Ml6z7aZ42vsRLAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T12:27:01.858888Z"},"content_sha256":"250374c5580d9be169cd009200c47821699a473fcceb606d9f1e2de15fd99d8a","schema_version":"1.0","event_id":"sha256:250374c5580d9be169cd009200c47821699a473fcceb606d9f1e2de15fd99d8a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/D2RF34U7ZPCHD7LGSORIJKV55X/bundle.json","state_url":"https://pith.science/pith/D2RF34U7ZPCHD7LGSORIJKV55X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/D2RF34U7ZPCHD7LGSORIJKV55X/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":"2026-05-22T12:27:01Z","links":{"resolver":"https://pith.science/pith/D2RF34U7ZPCHD7LGSORIJKV55X","bundle":"https://pith.science/pith/D2RF34U7ZPCHD7LGSORIJKV55X/bundle.json","state":"https://pith.science/pith/D2RF34U7ZPCHD7LGSORIJKV55X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/D2RF34U7ZPCHD7LGSORIJKV55X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:D2RF34U7ZPCHD7LGSORIJKV55X","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":"ba6613cffa89e0d8225abfee4b0559868a8e840cffd7b806db1928ca4dc9018a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-11-14T16:56:27Z","title_canon_sha256":"28e13299db070219125313d36d5e4455d923c6773ba60d69cec3886659b7b5a1"},"schema_version":"1.0","source":{"id":"1811.05903","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1811.05903","created_at":"2026-05-17T23:50:44Z"},{"alias_kind":"arxiv_version","alias_value":"1811.05903v3","created_at":"2026-05-17T23:50:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1811.05903","created_at":"2026-05-17T23:50:44Z"},{"alias_kind":"pith_short_12","alias_value":"D2RF34U7ZPCH","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_16","alias_value":"D2RF34U7ZPCHD7LG","created_at":"2026-05-18T12:32:19Z"},{"alias_kind":"pith_short_8","alias_value":"D2RF34U7","created_at":"2026-05-18T12:32:19Z"}],"graph_snapshots":[{"event_id":"sha256:250374c5580d9be169cd009200c47821699a473fcceb606d9f1e2de15fd99d8a","target":"graph","created_at":"2026-05-17T23:50:44Z","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":"We present the multi-GPU realization of the StePS (Stereographically Projected Cosmological Simulations) algorithm with MPI-OpenMP-CUDA hybrid parallelization and nearly ideal scale-out to multiple compute nodes. Our new zoom-in cosmological direct N-body simulation method simulates the infinite universe with unprecedented dynamic range for a given amount of memory and, in contrast to traditional periodic simulations, its fundamental geometry and topology match observations. By using a spherical geometry instead of periodic boundary conditions, and gradually decreasing the mass resolution with","authors_text":"Alexander S. Szalay, G\\'abor R\\'acz, Istv\\'an Csabai, Istv\\'an Szapudi, L\\'aszl\\'o Dobos","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-11-14T16:56:27Z","title":"StePS: A Multi-GPU Cosmological N-body Code for Compactified Simulations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1811.05903","kind":"arxiv","version":3},"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":"sha256:6f86cd1fdd1b92e80025d0fe4400347a1e0b07fdfff275dc9113cac871b10dcd","target":"record","created_at":"2026-05-17T23:50:44Z","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":"ba6613cffa89e0d8225abfee4b0559868a8e840cffd7b806db1928ca4dc9018a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2018-11-14T16:56:27Z","title_canon_sha256":"28e13299db070219125313d36d5e4455d923c6773ba60d69cec3886659b7b5a1"},"schema_version":"1.0","source":{"id":"1811.05903","kind":"arxiv","version":3}},"canonical_sha256":"1ea25df29fcbc471fd6693a284aabdedf9a4a519bf5d2fa769fd43888d04891a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1ea25df29fcbc471fd6693a284aabdedf9a4a519bf5d2fa769fd43888d04891a","first_computed_at":"2026-05-17T23:50:44.791435Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:50:44.791435Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"/sjsUsAYmv3oA0XzpBJ7iNmkwmVdlEksUwr1tr3Mm4baTSrJsLFvYDqAaVHvFzNeVgjzYoFX3saYR5fFpK+wBA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:50:44.791867Z","signed_message":"canonical_sha256_bytes"},"source_id":"1811.05903","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6f86cd1fdd1b92e80025d0fe4400347a1e0b07fdfff275dc9113cac871b10dcd","sha256:250374c5580d9be169cd009200c47821699a473fcceb606d9f1e2de15fd99d8a"],"state_sha256":"c4c424ca2329aabf08b25f79b6485f6245d25b5bd0a90ea8e6d7d6e309b6a00b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vzsh0iNOYxTVJIiFUBIpflULA+EsQl49NerZK9mruBaOhvauxMRsHH9dNXq1gsECtchTlTtLkmyaJMkBZncHDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T12:27:01.861865Z","bundle_sha256":"c61aa8060d6c9c3492f39fce63b8b3ef0730b399e560be611f473a1730aeec04"}}