{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2021:5XNXWMBZZMLCS63QM3TCXI5LLP","short_pith_number":"pith:5XNXWMBZ","schema_version":"1.0","canonical_sha256":"eddb7b3039cb16297b7066e62ba3ab5be99469f5ee41d1083fac19cad2b50e6b","source":{"kind":"arxiv","id":"2109.04477","version":2},"attestation_state":"computed","paper":{"title":"Extraction of energy from an extremal rotating electrovacuum black hole: Particle collisions in the equatorial plane","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","hep-th"],"primary_cat":"gr-qc","authors_text":"Filip Hejda, Jos\\'e P. S. Lemos, Oleg B. Zaslavskii","submitted_at":"2021-09-09T18:00:00Z","abstract_excerpt":"The collisional Penrose process received much attention when Banados, Silk and West (BSW) pointed out the possibility of test-particle collisions with arbitrarily high center-of-mass energy in the vicinity of the horizon of an extremally rotating black hole. However, the energy that can be extracted from the black hole in this promising, if simplified, scenario, called the BSW effect, turned out to be subject to unconditional upper bounds. And although such bounds were not found for the electrostatic variant of the process, this version is also astrophysically unfeasible, since it requires a m"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"2109.04477","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2021-09-09T18:00:00Z","cross_cats_sorted":["astro-ph.HE","hep-th"],"title_canon_sha256":"778ce904294af80e5ff9d6ad7e44ebb7b5407113a3c84dbe860bf68a31dfc149","abstract_canon_sha256":"14a48ff1e3c8853365c8c2db5170d21ecccdc93ab94df3eb9f3986d715514fa3"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T04:00:57.029943Z","signature_b64":"WNjxjDIjtZwLTEuN50TJHyMEAFBqPt5M5x/CNtBYclzfzMwoalQZeMTRsc5MDrAOhBLiTCd9Qn5yAYKHlV+XAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eddb7b3039cb16297b7066e62ba3ab5be99469f5ee41d1083fac19cad2b50e6b","last_reissued_at":"2026-07-05T04:00:57.029454Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T04:00:57.029454Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Extraction of energy from an extremal rotating electrovacuum black hole: Particle collisions in the equatorial plane","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","hep-th"],"primary_cat":"gr-qc","authors_text":"Filip Hejda, Jos\\'e P. S. Lemos, Oleg B. Zaslavskii","submitted_at":"2021-09-09T18:00:00Z","abstract_excerpt":"The collisional Penrose process received much attention when Banados, Silk and West (BSW) pointed out the possibility of test-particle collisions with arbitrarily high center-of-mass energy in the vicinity of the horizon of an extremally rotating black hole. However, the energy that can be extracted from the black hole in this promising, if simplified, scenario, called the BSW effect, turned out to be subject to unconditional upper bounds. And although such bounds were not found for the electrostatic variant of the process, this version is also astrophysically unfeasible, since it requires a m"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.04477","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/2109.04477/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"2109.04477","created_at":"2026-07-05T04:00:57.029510+00:00"},{"alias_kind":"arxiv_version","alias_value":"2109.04477v2","created_at":"2026-07-05T04:00:57.029510+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.04477","created_at":"2026-07-05T04:00:57.029510+00:00"},{"alias_kind":"pith_short_12","alias_value":"5XNXWMBZZMLC","created_at":"2026-07-05T04:00:57.029510+00:00"},{"alias_kind":"pith_short_16","alias_value":"5XNXWMBZZMLCS63Q","created_at":"2026-07-05T04:00:57.029510+00:00"},{"alias_kind":"pith_short_8","alias_value":"5XNXWMBZ","created_at":"2026-07-05T04:00:57.029510+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2506.23103","citing_title":"Influence of external magnetic fields on charged particle motion around a Schwarzschild-like black hole","ref_index":53,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/5XNXWMBZZMLCS63QM3TCXI5LLP","json":"https://pith.science/pith/5XNXWMBZZMLCS63QM3TCXI5LLP.json","graph_json":"https://pith.science/api/pith-number/5XNXWMBZZMLCS63QM3TCXI5LLP/graph.json","events_json":"https://pith.science/api/pith-number/5XNXWMBZZMLCS63QM3TCXI5LLP/events.json","paper":"https://pith.science/paper/5XNXWMBZ"},"agent_actions":{"view_html":"https://pith.science/pith/5XNXWMBZZMLCS63QM3TCXI5LLP","download_json":"https://pith.science/pith/5XNXWMBZZMLCS63QM3TCXI5LLP.json","view_paper":"https://pith.science/paper/5XNXWMBZ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2109.04477&json=true","fetch_graph":"https://pith.science/api/pith-number/5XNXWMBZZMLCS63QM3TCXI5LLP/graph.json","fetch_events":"https://pith.science/api/pith-number/5XNXWMBZZMLCS63QM3TCXI5LLP/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/5XNXWMBZZMLCS63QM3TCXI5LLP/action/timestamp_anchor","attest_storage":"https://pith.science/pith/5XNXWMBZZMLCS63QM3TCXI5LLP/action/storage_attestation","attest_author":"https://pith.science/pith/5XNXWMBZZMLCS63QM3TCXI5LLP/action/author_attestation","sign_citation":"https://pith.science/pith/5XNXWMBZZMLCS63QM3TCXI5LLP/action/citation_signature","submit_replication":"https://pith.science/pith/5XNXWMBZZMLCS63QM3TCXI5LLP/action/replication_record"}},"created_at":"2026-07-05T04:00:57.029510+00:00","updated_at":"2026-07-05T04:00:57.029510+00:00"}