{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:VYVZB3IEVKQDT24UESDSYSHSNF","short_pith_number":"pith:VYVZB3IE","canonical_record":{"source":{"id":"2506.13850","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-06-16T18:00:00Z","cross_cats_sorted":["astro-ph.HE","hep-th"],"title_canon_sha256":"dd0177c19246f3109626c2c413e9bd781cef95ec3e5cc735c3520015a9e7d0ab","abstract_canon_sha256":"a1732d28debd9cab38904db616f321873708c74ccc904cc358f4ffc10e4d0acb"},"schema_version":"1.0"},"canonical_sha256":"ae2b90ed04aaa039eb9424872c48f2695d58ff7b8e86e208b5497b062c808c70","source":{"kind":"arxiv","id":"2506.13850","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.13850","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"arxiv_version","alias_value":"2506.13850v1","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.13850","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"pith_short_12","alias_value":"VYVZB3IEVKQD","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"pith_short_16","alias_value":"VYVZB3IEVKQDT24U","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"pith_short_8","alias_value":"VYVZB3IE","created_at":"2026-07-05T11:22:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:VYVZB3IEVKQDT24UESDSYSHSNF","target":"record","payload":{"canonical_record":{"source":{"id":"2506.13850","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-06-16T18:00:00Z","cross_cats_sorted":["astro-ph.HE","hep-th"],"title_canon_sha256":"dd0177c19246f3109626c2c413e9bd781cef95ec3e5cc735c3520015a9e7d0ab","abstract_canon_sha256":"a1732d28debd9cab38904db616f321873708c74ccc904cc358f4ffc10e4d0acb"},"schema_version":"1.0"},"canonical_sha256":"ae2b90ed04aaa039eb9424872c48f2695d58ff7b8e86e208b5497b062c808c70","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:22:44.804276Z","signature_b64":"t+wpRyoZfeZ6TQeEtnunyVvpsZLYOVP92kLIF325YnfU0POTXtbeXHhfuZLHU9W8uYi38gyGr0AJUWLGgUeeAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ae2b90ed04aaa039eb9424872c48f2695d58ff7b8e86e208b5497b062c808c70","last_reissued_at":"2026-07-05T11:22:44.803817Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:22:44.803817Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2506.13850","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":"2026-07-05T11:22:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5uILWCZfMV77uKyFPbqHG6O4Q2/t0els7ROw1aQ+Ed2ahS0AP3R9E/XcUkwyx0twhp6lmYPzrQDCrr0hPlO6Dg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T15:45:09.168336Z"},"content_sha256":"e4bf20210f8e07bdfd9ad2cd7bd39fbf924ecafaccaa1f7e2afc1005d61502e6","schema_version":"1.0","event_id":"sha256:e4bf20210f8e07bdfd9ad2cd7bd39fbf924ecafaccaa1f7e2afc1005d61502e6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:VYVZB3IEVKQDT24UESDSYSHSNF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Superradiant amplification by rotating viscous compact objects","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE","hep-th"],"primary_cat":"gr-qc","authors_text":"Jaime Redondo-Yuste, Vitor Cardoso","submitted_at":"2025-06-16T18:00:00Z","abstract_excerpt":"We study fluctuations of rotating viscous stars, using the causal relativistic hydrodynamics of Bemfica, Disconzi, Kovtun, and Noronha. We derive, in a slow-rotation approximation, a coupled system of equations describing the propagation of axial gravitational waves through the star, which couple to internal viscous modes. We show that rotating viscous stars amplify incoming low-frequency gravitational waves, a phenomenon which we argue to be universal. Superradiant amplification does not seem to trigger an instability for uniformly rotating stars, even if the object is compact enough to have "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.13850","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2506.13850/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T11:22:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wd9kP/Loah7eQMfxngOmm3zlETXKI5Vr6HDPbm+bEart55j7fv+SRL8kkSGUNsjMnqqLYc7/beD8su0wlEpKCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T15:45:09.168968Z"},"content_sha256":"e07d9e051aed161336c860ff651c725b117605bdaa5d257e722e4e0db0965e83","schema_version":"1.0","event_id":"sha256:e07d9e051aed161336c860ff651c725b117605bdaa5d257e722e4e0db0965e83"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VYVZB3IEVKQDT24UESDSYSHSNF/bundle.json","state_url":"https://pith.science/pith/VYVZB3IEVKQDT24UESDSYSHSNF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VYVZB3IEVKQDT24UESDSYSHSNF/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":"2026-08-07T15:45:09Z","links":{"resolver":"https://pith.science/pith/VYVZB3IEVKQDT24UESDSYSHSNF","bundle":"https://pith.science/pith/VYVZB3IEVKQDT24UESDSYSHSNF/bundle.json","state":"https://pith.science/pith/VYVZB3IEVKQDT24UESDSYSHSNF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VYVZB3IEVKQDT24UESDSYSHSNF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:VYVZB3IEVKQDT24UESDSYSHSNF","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":"a1732d28debd9cab38904db616f321873708c74ccc904cc358f4ffc10e4d0acb","cross_cats_sorted":["astro-ph.HE","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-06-16T18:00:00Z","title_canon_sha256":"dd0177c19246f3109626c2c413e9bd781cef95ec3e5cc735c3520015a9e7d0ab"},"schema_version":"1.0","source":{"id":"2506.13850","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.13850","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"arxiv_version","alias_value":"2506.13850v1","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.13850","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"pith_short_12","alias_value":"VYVZB3IEVKQD","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"pith_short_16","alias_value":"VYVZB3IEVKQDT24U","created_at":"2026-07-05T11:22:44Z"},{"alias_kind":"pith_short_8","alias_value":"VYVZB3IE","created_at":"2026-07-05T11:22:44Z"}],"graph_snapshots":[{"event_id":"sha256:e07d9e051aed161336c860ff651c725b117605bdaa5d257e722e4e0db0965e83","target":"graph","created_at":"2026-07-05T11:22:44Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2506.13850/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We study fluctuations of rotating viscous stars, using the causal relativistic hydrodynamics of Bemfica, Disconzi, Kovtun, and Noronha. We derive, in a slow-rotation approximation, a coupled system of equations describing the propagation of axial gravitational waves through the star, which couple to internal viscous modes. We show that rotating viscous stars amplify incoming low-frequency gravitational waves, a phenomenon which we argue to be universal. Superradiant amplification does not seem to trigger an instability for uniformly rotating stars, even if the object is compact enough to have ","authors_text":"Jaime Redondo-Yuste, Vitor Cardoso","cross_cats":["astro-ph.HE","hep-th"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-06-16T18:00:00Z","title":"Superradiant amplification by rotating viscous compact objects"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.13850","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:e4bf20210f8e07bdfd9ad2cd7bd39fbf924ecafaccaa1f7e2afc1005d61502e6","target":"record","created_at":"2026-07-05T11:22:44Z","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":"a1732d28debd9cab38904db616f321873708c74ccc904cc358f4ffc10e4d0acb","cross_cats_sorted":["astro-ph.HE","hep-th"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"gr-qc","submitted_at":"2025-06-16T18:00:00Z","title_canon_sha256":"dd0177c19246f3109626c2c413e9bd781cef95ec3e5cc735c3520015a9e7d0ab"},"schema_version":"1.0","source":{"id":"2506.13850","kind":"arxiv","version":1}},"canonical_sha256":"ae2b90ed04aaa039eb9424872c48f2695d58ff7b8e86e208b5497b062c808c70","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ae2b90ed04aaa039eb9424872c48f2695d58ff7b8e86e208b5497b062c808c70","first_computed_at":"2026-07-05T11:22:44.803817Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:22:44.803817Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"t+wpRyoZfeZ6TQeEtnunyVvpsZLYOVP92kLIF325YnfU0POTXtbeXHhfuZLHU9W8uYi38gyGr0AJUWLGgUeeAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T11:22:44.804276Z","signed_message":"canonical_sha256_bytes"},"source_id":"2506.13850","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e4bf20210f8e07bdfd9ad2cd7bd39fbf924ecafaccaa1f7e2afc1005d61502e6","sha256:e07d9e051aed161336c860ff651c725b117605bdaa5d257e722e4e0db0965e83"],"state_sha256":"664a651402e6ad0a344f47eab110a6e968803b1746cc1f69c80284b0c5f636bd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ns+NQMoDSSMFiFtNzefdF8QHmkwAbNdKafzyiRcSv4BwpzVgkYVOU7/r5sVc19cgW94wY0I3p31/qEADJCnKAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T15:45:09.188997Z","bundle_sha256":"7ab64e0132cc44e9ce7220dd21dc6b3a8dcc609e0f1263d16a28fdce43ecbcdb"}}