{"paper":{"title":"Thin Accretion Disks around Rotating Charged Black Holes in an Effective Higher-Curvature Spacetime","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"An effective higher-curvature parameter moves the ISCO inward and raises radiation flux and temperature in thin accretion disks around rotating charged black holes.","cross_cats":["astro-ph.CO","hep-ph","hep-th"],"primary_cat":"gr-qc","authors_text":"Kourosh Nozari, Mohammad Hassani, Sara Saghafi","submitted_at":"2026-05-13T17:19:24Z","abstract_excerpt":"We investigate the structure and emission properties of a thin accretion disk around a rotating charged black hole described by an effective higher-curvature-inspired spacetime, constructed as a phenomenological deformation of the Kerr Newman geometry. In this framework, the deformation is introduced through a modification of the metric function $\\Delta$ by an effective Gauss-Bonnet-like parameter $\\alpha$, such that the spacetime reduces to the standard Kerr Newman solution in the limit $\\alpha \\to 0$. Adopting a kinematical approach, we use test-particle motion to derive the specific energy,"},"claims":{"count":4,"items":[{"kind":"strongest_claim","text":"Increasing the effective Gauss-Bonnet-like parameter alpha shifts the ISCO inward and enhances the disk's radiation flux and temperature, while charge suppresses these quantities.","source":"verdict.strongest_claim","status":"machine_extracted","claim_id":"C1","attestation":"unclaimed"},{"kind":"weakest_assumption","text":"The spacetime is treated as a fixed phenomenological deformation of Kerr-Newman without deriving the metric from a consistent higher-curvature action or checking its stability and causality.","source":"verdict.weakest_assumption","status":"machine_extracted","claim_id":"C2","attestation":"unclaimed"},{"kind":"one_line_summary","text":"An effective Gauss-Bonnet-like deformation of the Kerr-Newman metric moves the ISCO inward, raises radiative efficiency, flux, and temperature, while charge suppresses these quantities.","source":"verdict.one_line_summary","status":"machine_extracted","claim_id":"C3","attestation":"unclaimed"},{"kind":"headline","text":"An effective higher-curvature parameter moves the ISCO inward and raises radiation flux and temperature in thin accretion disks around rotating charged black holes.","source":"verdict.pith_extraction.headline","status":"machine_extracted","claim_id":"C4","attestation":"unclaimed"}],"snapshot_sha256":"4701bc223dcf58e70f7821742106ff80c21112ab588cfd50f965cb8e3f772d5e"},"source":{"id":"2605.13797","kind":"arxiv","version":1},"verdict":{"id":"0db8b8f2-a3b2-44a3-b82a-415b0aa1ed0c","model_set":{"reader":"grok-4.3"},"created_at":"2026-05-14T17:40:07.553666Z","strongest_claim":"Increasing the effective Gauss-Bonnet-like parameter alpha shifts the ISCO inward and enhances the disk's radiation flux and temperature, while charge suppresses these quantities.","one_line_summary":"An effective Gauss-Bonnet-like deformation of the Kerr-Newman metric moves the ISCO inward, raises radiative efficiency, flux, and temperature, while charge suppresses these quantities.","pipeline_version":"pith-pipeline@v0.9.0","weakest_assumption":"The spacetime is treated as a fixed phenomenological deformation of Kerr-Newman without deriving the metric from a consistent higher-curvature action or checking its stability and causality.","pith_extraction_headline":"An effective higher-curvature parameter moves the ISCO inward and raises radiation flux and temperature in thin accretion disks around rotating charged black holes."},"references":{"count":120,"sample":[{"doi":"","year":2019,"title":"Carroll, S. M. (2019). Spacetime and geometry. Cambridge University Press","work_id":"47c95a6d-6332-486c-8668-7e8203e16730","ref_index":1,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1916,"title":"K. Schwarzschild, ¨Uber das Gravitationsfeld eines Massenpunktes nach der Einsteinschen Theorie, Sitzungsberichte der K¨ oniglich Preußischen Akademie der Wissenschaften (Berlin), 189–196 (1916)","work_id":"4698d0eb-d58e-4cab-b9c5-4e9ad09147bb","ref_index":2,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":1963,"title":"Kerr, R. P. (1963). Gravitational field of a spinning mass as an example of algebraically special metrics. Physical review letters, 11(5), 237","work_id":"caac2083-4f9b-4078-9ca1-69b68b9b3b15","ref_index":3,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2022,"title":"Baumann, D. (2022). Cosmology. Cambridge University Press","work_id":"ebdfb6f6-7865-46c1-b192-d2a27d9a2eb0","ref_index":4,"cited_arxiv_id":"","is_internal_anchor":false},{"doi":"","year":2012,"title":"G., Padilla, A., & Skordis, C","work_id":"f7264fe1-7ef9-44aa-9962-d07991d59dce","ref_index":5,"cited_arxiv_id":"","is_internal_anchor":false}],"resolved_work":120,"snapshot_sha256":"01c34f58f041597895aa676e095c171755ed00bbd57cbbd484cbc1963a449ee1","internal_anchors":3},"formal_canon":{"evidence_count":2,"snapshot_sha256":"40d6760338acec6b03de9e70d476bed1847b1efeee30325798d7eeed04f78f96"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}