{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2018:3NQZB4W7VUPNIXHTYXUNPF6MR4","short_pith_number":"pith:3NQZB4W7","schema_version":"1.0","canonical_sha256":"db6190f2dfad1ed45cf3c5e8d797cc8f1d3dad43e87be7eed57e85268dac045a","source":{"kind":"arxiv","id":"1805.00026","version":3},"attestation_state":"computed","paper":{"title":"Decreasing entropy of dynamical black holes in critical gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Hideki Maeda, Jiri Podolsky, Robert Svarc","submitted_at":"2018-04-30T18:00:02Z","abstract_excerpt":"Critical gravity is a quadratic curvature gravity in four dimensions which is ghost-free around the AdS background. Constructing a Vaidya-type exact solution, we show that the area of a black hole defined by a future outer trapping horizon can shrink by injecting a charged null fluid with positive energy density, so that a black hole is no more a one-way membrane even under the null energy condition. In addition, the solution shows that the Wald-Kodama dynamical entropy of a black hole is negative and can decrease. These properties expose the pathological aspects of critical gravity at the non"},"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":"1805.00026","kind":"arxiv","version":3},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2018-04-30T18:00:02Z","cross_cats_sorted":["hep-th"],"title_canon_sha256":"819abcacfffbf5e1c6c29123a17872c444c6d1e061148ccbd664cf1d8fd38b03","abstract_canon_sha256":"3bc908a1172fc07a43709a2d76aef3f65a0524b1bd307bb6a0299a6902f9d591"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:09:24.970283Z","signature_b64":"U92refLxkOhHCtaQ7eCsFYP1ssOqN9KIJl8ctaR7U0+8V4nn4CvyWiQIVkr/qjkWiuWqrTGoALp7wb4zzmaNDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"db6190f2dfad1ed45cf3c5e8d797cc8f1d3dad43e87be7eed57e85268dac045a","last_reissued_at":"2026-05-18T00:09:24.969691Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:09:24.969691Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Decreasing entropy of dynamical black holes in critical gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-th"],"primary_cat":"gr-qc","authors_text":"Hideki Maeda, Jiri Podolsky, Robert Svarc","submitted_at":"2018-04-30T18:00:02Z","abstract_excerpt":"Critical gravity is a quadratic curvature gravity in four dimensions which is ghost-free around the AdS background. Constructing a Vaidya-type exact solution, we show that the area of a black hole defined by a future outer trapping horizon can shrink by injecting a charged null fluid with positive energy density, so that a black hole is no more a one-way membrane even under the null energy condition. In addition, the solution shows that the Wald-Kodama dynamical entropy of a black hole is negative and can decrease. These properties expose the pathological aspects of critical gravity at the non"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.00026","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1805.00026","created_at":"2026-05-18T00:09:24.969787+00:00"},{"alias_kind":"arxiv_version","alias_value":"1805.00026v3","created_at":"2026-05-18T00:09:24.969787+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1805.00026","created_at":"2026-05-18T00:09:24.969787+00:00"},{"alias_kind":"pith_short_12","alias_value":"3NQZB4W7VUPN","created_at":"2026-05-18T12:32:02.567920+00:00"},{"alias_kind":"pith_short_16","alias_value":"3NQZB4W7VUPNIXHT","created_at":"2026-05-18T12:32:02.567920+00:00"},{"alias_kind":"pith_short_8","alias_value":"3NQZB4W7","created_at":"2026-05-18T12:32:02.567920+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/3NQZB4W7VUPNIXHTYXUNPF6MR4","json":"https://pith.science/pith/3NQZB4W7VUPNIXHTYXUNPF6MR4.json","graph_json":"https://pith.science/api/pith-number/3NQZB4W7VUPNIXHTYXUNPF6MR4/graph.json","events_json":"https://pith.science/api/pith-number/3NQZB4W7VUPNIXHTYXUNPF6MR4/events.json","paper":"https://pith.science/paper/3NQZB4W7"},"agent_actions":{"view_html":"https://pith.science/pith/3NQZB4W7VUPNIXHTYXUNPF6MR4","download_json":"https://pith.science/pith/3NQZB4W7VUPNIXHTYXUNPF6MR4.json","view_paper":"https://pith.science/paper/3NQZB4W7","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1805.00026&json=true","fetch_graph":"https://pith.science/api/pith-number/3NQZB4W7VUPNIXHTYXUNPF6MR4/graph.json","fetch_events":"https://pith.science/api/pith-number/3NQZB4W7VUPNIXHTYXUNPF6MR4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/3NQZB4W7VUPNIXHTYXUNPF6MR4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/3NQZB4W7VUPNIXHTYXUNPF6MR4/action/storage_attestation","attest_author":"https://pith.science/pith/3NQZB4W7VUPNIXHTYXUNPF6MR4/action/author_attestation","sign_citation":"https://pith.science/pith/3NQZB4W7VUPNIXHTYXUNPF6MR4/action/citation_signature","submit_replication":"https://pith.science/pith/3NQZB4W7VUPNIXHTYXUNPF6MR4/action/replication_record"}},"created_at":"2026-05-18T00:09:24.969787+00:00","updated_at":"2026-05-18T00:09:24.969787+00:00"}