{"paper":{"title":"QPOs from the Viscous Transonic Accretion Flow Around a Spinning Black Hole","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"The frequency range of QPOs in viscous accretion flows depends strongly on black hole spin.","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Indranil Chattopadhyay, M. Saleem Khan, Priyesh Kumar Tripathi, Raj Kishor Joshi, Sanjit Debnath, Soumyadip Mandal","submitted_at":"2026-04-21T17:15:30Z","abstract_excerpt":"We investigate the dynamics of transonic advective accretion flows around spinning black holes in the presence of viscosity. The spacetime of a Kerr black hole is approximated using a pseudo-potential. We study viscously driven shock oscillations over a range of black hole spin parameters. Our results show that the frequency range of quasi-periodic oscillations (QPOs) obtained from the power density spectra depends strongly on the black hole spin. Low-spin systems predominantly exhibit low-frequency QPOs, whereas rapidly rotating black holes (greater than 0.9 Kerr parameter) produce QPOs spann"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Our results show that the frequency range of quasi-periodic oscillations (QPOs) obtained from the power density spectra depends strongly on the black hole spin. Low-spin systems predominantly exhibit low-frequency QPOs, whereas rapidly rotating black holes (0.9) produce QPOs spanning a broad range from low to high frequencies, comparable to those observed in black hole X-ray binaries.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The spacetime of a Kerr black hole is approximated using a pseudo-potential, which may not fully capture all relativistic effects in the viscous flow dynamics leading to shock oscillations.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"Viscous shock oscillations in transonic flows around spinning black holes yield QPO frequency ranges that broaden with increasing spin and match observations in black hole X-ray binaries.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"The frequency range of QPOs in viscous accretion flows depends strongly on black hole spin.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"0f237fefdabc8f04a8c3e56f0853009cb093d0d07ac74a451588fa6273e26d41"},"source":{"id":"2604.19692","kind":"arxiv","version":2},"verdict":{"id":"e7d839ec-ae07-4f13-a3d7-6b4dc36a974b","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-10T01:28:49.757483Z","strongest_claim":"Our results show that the frequency range of quasi-periodic oscillations (QPOs) obtained from the power density spectra depends strongly on the black hole spin. Low-spin systems predominantly exhibit low-frequency QPOs, whereas rapidly rotating black holes (0.9) produce QPOs spanning a broad range from low to high frequencies, comparable to those observed in black hole X-ray binaries.","one_line_summary":"Viscous shock oscillations in transonic flows around spinning black holes yield QPO frequency ranges that broaden with increasing spin and match observations in black hole X-ray binaries.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The spacetime of a Kerr black hole is approximated using a pseudo-potential, which may not fully capture all relativistic effects in the viscous flow dynamics leading to shock oscillations.","pith_extraction_headline":"The frequency range of QPOs in viscous accretion flows depends strongly on black hole spin."},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2604.19692/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"ai_meta_artifact","ran_at":"2026-05-21T16:33:42.982332Z","status":"completed","version":"1.0.0","findings_count":0},{"name":"doi_compliance","ran_at":"2026-05-20T02:39:28.284701Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"6539ba5af134fde2ac94f48af9458016c26783f5f122077526f2fe35252ac1c9"},"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"}