{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:XOG3RZE3LMK73ZQ5B6SEPH4O2X","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":"800acd61ff56fdd842d583ee8a5cb7bc423deda3de29d163a4032cf14ce53e72","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-12-06T07:11:02Z","title_canon_sha256":"7a3ba2794a6ee307beda8e645a2939be91dd11a751d97eb74dcc8670e6582cdd"},"schema_version":"1.0","source":{"id":"1312.1789","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1312.1789","created_at":"2026-05-18T03:05:19Z"},{"alias_kind":"arxiv_version","alias_value":"1312.1789v1","created_at":"2026-05-18T03:05:19Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1312.1789","created_at":"2026-05-18T03:05:19Z"},{"alias_kind":"pith_short_12","alias_value":"XOG3RZE3LMK7","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_16","alias_value":"XOG3RZE3LMK73ZQ5","created_at":"2026-05-18T12:28:06Z"},{"alias_kind":"pith_short_8","alias_value":"XOG3RZE3","created_at":"2026-05-18T12:28:06Z"}],"graph_snapshots":[{"event_id":"sha256:a84641e12dabcf29ed4b03d8b4b9a8128d26f423063148534aa577b8d11cda33","target":"graph","created_at":"2026-05-18T03:05:19Z","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 direct astrophysical N-body simulations with up to a few million bodies using our parallel MPI/CUDA code on large GPU clusters in China, Ukraine and Germany, with different kinds of GPU hardware. These clusters are directly linked under the Chinese Academy of Sciences special GPU cluster program in the cooperation of ICCS (International Center for Computational Science). We reach about the half the peak Kepler K20 GPU performance for our phi-GPU code [2], in a real application scenario with individual hierarchically block time-steps with the high (4th, 6th and 8th) order Hermite int","authors_text":"C. Li, G. Kennedy, I. Zinchenko, L. Naso, L. Wang, M. Tsai, O. Veles, P. Berczik, R. Spurzem, S. Huang, S. Li, S. Zhong","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-12-06T07:11:02Z","title":"Up to 700k GPU cores, Kepler, and the Exascale future for simulations of star clusters around black holes"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1312.1789","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":"sha256:7493c31ee789d499bbcc08f47191481c3ea9ae2c9ff3545a63d2e0755d5cf051","target":"record","created_at":"2026-05-18T03:05:19Z","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":"800acd61ff56fdd842d583ee8a5cb7bc423deda3de29d163a4032cf14ce53e72","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2013-12-06T07:11:02Z","title_canon_sha256":"7a3ba2794a6ee307beda8e645a2939be91dd11a751d97eb74dcc8670e6582cdd"},"schema_version":"1.0","source":{"id":"1312.1789","kind":"arxiv","version":1}},"canonical_sha256":"bb8db8e49b5b15fde61d0fa4479f8ed5f952efa9a7c44ca7cc7a6ca14b0c3b54","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bb8db8e49b5b15fde61d0fa4479f8ed5f952efa9a7c44ca7cc7a6ca14b0c3b54","first_computed_at":"2026-05-18T03:05:19.762274Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:05:19.762274Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Ep3DUhgnyjwPSI1OIsdlTLMVfgxPn5KVMvAWv5s5u4jRQKDb2JrY5M2nJXFY/KmIJ98qulaEPNa9r4iZ3npKCA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:05:19.762706Z","signed_message":"canonical_sha256_bytes"},"source_id":"1312.1789","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7493c31ee789d499bbcc08f47191481c3ea9ae2c9ff3545a63d2e0755d5cf051","sha256:a84641e12dabcf29ed4b03d8b4b9a8128d26f423063148534aa577b8d11cda33"],"state_sha256":"68d14d62145162c6c61616fbe7ba605e232ae46358f042a254a26a39c1c8c825"}