15252 10.1140/epjc/s10052-025-15252-0 58 58 Energetics of accretion disk around black holes in Einstein–Gauss–Bonnet gravity Regular Article - Theoretical Physics Theoretical Physics 1 11 2025 12 23 2025 10 20 2025 12 20 2026 1 22 2026 1 22 The Author(s) 2026 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ . Funded by SCOAP3. 10052 86 86 1 1 Ikrom Ergashov i.ergashov@newuu.uz Bakhtiyor Narzilloev b.narzilloev@newuu.uz Ibrar Hussain ibrar.hussain@seecs.nust.edu.pk Ahmadjon Abdujabbarov ahmadjon@astrin.uz Bobomurat Ahmedov ahmedov@astrin.uz https://ror.org/035v3tr79 0000 0005 0985 3584 Institute for Advanced Studies New Uzbekistan University Movarounnahr Str. 1 100000 Tashkent Uzbekistan https://ror.org/03w2j5y17 grid.412117.0 0000 0001 2234 2376 School of Electrical Engineering and Computer Science National University of Sciences and Technology H-12 Islamabad Pakistan https://ror.org/01yqg2h08 grid.19373.3f 0000 0001 0193 3564 School of Physics Harbin Institute of Technology Harbin 150001 People’s Republic of China https://ror.org/01bmg2a15 grid.444747.0 0000 0004 0642 5819 Tashkent State Technical University 100095 Tashkent Uzbekistan https://ror.org/01136x372 grid.443859.7 0000 0004 0477 2171 Institute of Nuclear Physics Ulugbek 1 100214 Tashkent Uzbekistan https://ror.org/011647w73 grid.23471.33 0000 0001 0941 3766 Institute of Theoretical Physics National University of Uzbekistan 100174 Tashkent Uzbekistan https://ror.org/014te7048 grid.442897.4 0000 0001 0743 1899 Research Center of Astrophysics and Cosmology Khazar University 41 Mehseti Street AZ1096 Baku Azerbaijan Abstract We investigate the spacetime geometry and astrophysical properties of a static, spherically symmetric black hole in the context of Einstein–Gauss–Bonnet gravity, characterized by a Gauss–Bonnet coupling constant κ and a non-electromagnetic geometric charge Q. The black hole solution reduces to the Reissner–Nordstrom or Schwarzschild spacetime in the appropriate limits. We analyze the influence of the parameters κ and Q on the event horizon properties, the innermost stable circular orbit, and the spacetime metric behavior. In the framework of the Novikov–Thorne thin disk model, we compute the flux, temperature, and spectrum of the accretion disk surrounding the black hole. Our results show that the parameters κ and Q significantly affect the disk’s thermal properties and radiation efficiency. Additionally, we demonstrate that the combined effect of these parameters can mimic the role of spin in Kerr black holes, allowing for degeneracy between rotation and geometric corrections. These findings offer potential observational signatures of modified gravity effects in high-energy astrophysical environments.