{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:6HJ2BYMLI3URBCT2GEZVYQQK44","short_pith_number":"pith:6HJ2BYML","canonical_record":{"source":{"id":"1803.01817","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"gr-qc","submitted_at":"2018-03-05T18:24:28Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"f3c816f253702cc0f07903bac72833c1c4fd1225fb80e28c7b88843a0cfd6f10","abstract_canon_sha256":"ef250e683dee676bb7272f8ad5a32d470b46d91cbe38c7e50cd8c1f4e879a903"},"schema_version":"1.0"},"canonical_sha256":"f1d3a0e18b46e9108a7a31335c420ae7259b847d6d7cba8a4a3653a44ed0d0a4","source":{"kind":"arxiv","id":"1803.01817","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.01817","created_at":"2026-05-18T00:21:59Z"},{"alias_kind":"arxiv_version","alias_value":"1803.01817v1","created_at":"2026-05-18T00:21:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.01817","created_at":"2026-05-18T00:21:59Z"},{"alias_kind":"pith_short_12","alias_value":"6HJ2BYMLI3UR","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"6HJ2BYMLI3URBCT2","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"6HJ2BYML","created_at":"2026-05-18T12:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:6HJ2BYMLI3URBCT2GEZVYQQK44","target":"record","payload":{"canonical_record":{"source":{"id":"1803.01817","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"gr-qc","submitted_at":"2018-03-05T18:24:28Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"f3c816f253702cc0f07903bac72833c1c4fd1225fb80e28c7b88843a0cfd6f10","abstract_canon_sha256":"ef250e683dee676bb7272f8ad5a32d470b46d91cbe38c7e50cd8c1f4e879a903"},"schema_version":"1.0"},"canonical_sha256":"f1d3a0e18b46e9108a7a31335c420ae7259b847d6d7cba8a4a3653a44ed0d0a4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:21:59.537936Z","signature_b64":"xpEFvdK3UhEqHYIjGyZUPo5gcjavoHDTcoyUGpMwo/+3XYZyNBJBVGJAP39w68zDsqy0l16LX0i80BSVlMqnBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f1d3a0e18b46e9108a7a31335c420ae7259b847d6d7cba8a4a3653a44ed0d0a4","last_reissued_at":"2026-05-18T00:21:59.537478Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:21:59.537478Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1803.01817","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":"2026-05-18T00:21:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kwV1a5VBlQ3INk2CakLJlkRptVIsO7afvXJdVfx7JUFKI8FFb7WICIlJctO1mJyiCxyeZCvJ24E/F1YCwjfBBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T19:08:54.386830Z"},"content_sha256":"6ceeb1acc8ec51b2de943900a073a9c5019f1c1da954799d6ea335e833161d9c","schema_version":"1.0","event_id":"sha256:6ceeb1acc8ec51b2de943900a073a9c5019f1c1da954799d6ea335e833161d9c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:6HJ2BYMLI3URBCT2GEZVYQQK44","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Superradiance Effect of a Black Hole Immersed in an Expanding Universe","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Eleftherios Papantonopoulos, Konstantinos Ntrekis, Stella Kiorpelidi","submitted_at":"2018-03-05T18:24:28Z","abstract_excerpt":"We studied the superradiance effect of a charge black hole immersed in an expanding Universe. We considered a test massive charged scalar field scattered off the horizon of the charge McVittie black hole. We carried out a detailed analysis of the electric energy extracted from the horizon of McVittie black hole in two different epochs of the expansion of the Universe, the dust dominated and radiation dominated epochs. We found that we have the superradiance effect in both epochs of the expansion of the Universe. Our study also provides evidence that we have extraction of energy from the horizo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.01817","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":""},"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":"2026-05-18T00:21:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/47mVqaciucLxJowRGTlXQgPIzv94vmsLEy0dXSreKGm+krQVT9lZ8wM9sYHjlZGXQBi/dc3MkpJTE1ivhGDBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T19:08:54.387393Z"},"content_sha256":"3646b7bfacc47b4b721baeea10b842cc32125a49deda95b76c17fb03ea507a66","schema_version":"1.0","event_id":"sha256:3646b7bfacc47b4b721baeea10b842cc32125a49deda95b76c17fb03ea507a66"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6HJ2BYMLI3URBCT2GEZVYQQK44/bundle.json","state_url":"https://pith.science/pith/6HJ2BYMLI3URBCT2GEZVYQQK44/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6HJ2BYMLI3URBCT2GEZVYQQK44/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":"2026-06-06T19:08:54Z","links":{"resolver":"https://pith.science/pith/6HJ2BYMLI3URBCT2GEZVYQQK44","bundle":"https://pith.science/pith/6HJ2BYMLI3URBCT2GEZVYQQK44/bundle.json","state":"https://pith.science/pith/6HJ2BYMLI3URBCT2GEZVYQQK44/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6HJ2BYMLI3URBCT2GEZVYQQK44/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:6HJ2BYMLI3URBCT2GEZVYQQK44","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":"ef250e683dee676bb7272f8ad5a32d470b46d91cbe38c7e50cd8c1f4e879a903","cross_cats_sorted":["hep-th"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"gr-qc","submitted_at":"2018-03-05T18:24:28Z","title_canon_sha256":"f3c816f253702cc0f07903bac72833c1c4fd1225fb80e28c7b88843a0cfd6f10"},"schema_version":"1.0","source":{"id":"1803.01817","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1803.01817","created_at":"2026-05-18T00:21:59Z"},{"alias_kind":"arxiv_version","alias_value":"1803.01817v1","created_at":"2026-05-18T00:21:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1803.01817","created_at":"2026-05-18T00:21:59Z"},{"alias_kind":"pith_short_12","alias_value":"6HJ2BYMLI3UR","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"6HJ2BYMLI3URBCT2","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"6HJ2BYML","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:3646b7bfacc47b4b721baeea10b842cc32125a49deda95b76c17fb03ea507a66","target":"graph","created_at":"2026-05-18T00:21:59Z","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 studied the superradiance effect of a charge black hole immersed in an expanding Universe. We considered a test massive charged scalar field scattered off the horizon of the charge McVittie black hole. We carried out a detailed analysis of the electric energy extracted from the horizon of McVittie black hole in two different epochs of the expansion of the Universe, the dust dominated and radiation dominated epochs. We found that we have the superradiance effect in both epochs of the expansion of the Universe. Our study also provides evidence that we have extraction of energy from the horizo","authors_text":"Eleftherios Papantonopoulos, Konstantinos Ntrekis, Stella Kiorpelidi","cross_cats":["hep-th"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"gr-qc","submitted_at":"2018-03-05T18:24:28Z","title":"Superradiance Effect of a Black Hole Immersed in an Expanding Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.01817","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":"sha256:6ceeb1acc8ec51b2de943900a073a9c5019f1c1da954799d6ea335e833161d9c","target":"record","created_at":"2026-05-18T00:21:59Z","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":"ef250e683dee676bb7272f8ad5a32d470b46d91cbe38c7e50cd8c1f4e879a903","cross_cats_sorted":["hep-th"],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"gr-qc","submitted_at":"2018-03-05T18:24:28Z","title_canon_sha256":"f3c816f253702cc0f07903bac72833c1c4fd1225fb80e28c7b88843a0cfd6f10"},"schema_version":"1.0","source":{"id":"1803.01817","kind":"arxiv","version":1}},"canonical_sha256":"f1d3a0e18b46e9108a7a31335c420ae7259b847d6d7cba8a4a3653a44ed0d0a4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f1d3a0e18b46e9108a7a31335c420ae7259b847d6d7cba8a4a3653a44ed0d0a4","first_computed_at":"2026-05-18T00:21:59.537478Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:21:59.537478Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xpEFvdK3UhEqHYIjGyZUPo5gcjavoHDTcoyUGpMwo/+3XYZyNBJBVGJAP39w68zDsqy0l16LX0i80BSVlMqnBg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:21:59.537936Z","signed_message":"canonical_sha256_bytes"},"source_id":"1803.01817","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6ceeb1acc8ec51b2de943900a073a9c5019f1c1da954799d6ea335e833161d9c","sha256:3646b7bfacc47b4b721baeea10b842cc32125a49deda95b76c17fb03ea507a66"],"state_sha256":"5fb1b326b910822f39a0cba5b16afbca52ce6f4eef5b0e3748c124782d4cb490"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZwngJy4S0GcoObqL6g8Vqkbxu4K/CAnLF8HZA62Hr7opKxSY7f7nKE9rmndK+yCww4o8XdTH4aIO7JFJbKMnBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T19:08:54.390143Z","bundle_sha256":"36bab9f3b2dbd39d6590db86954374f90abffaa1654da5ea0ed62c2bee76fb7b"}}