Rotating charged nonsingular black holes in loop quantum gravity and their observational imprints from EHT
Sekhmani Y. Ali H. Ghosh S.G. Boshkayev K.
January 2026Elsevier B.V.
Journal of High Energy Astrophysics
2026#49
We study the observational signatures of charged non-singular black holes (BHs) in loop quantum gravity (LQG), focusing on their shadows and constraints from Event Horizon Telescope (EHT) data. We employ a modified Newman-Janis algorithm (MNJA) to obtain a rotating BH metric from a static LQG-corrected solution characterized by spin a, charge Q, and the LQG parameter b0. The EHT observed shadows of Sgr A* and M87*, with angular diameters dsh=48.7±7μas and θd=42±3μas, and masses M∼4×106M⊙ and 6.5×109M⊙, respectively. We analyze shadow observables—areal radius Rs, distortion δs, and oblateness Ds—to constrain (Q,b0,a) using EHT data. For M87* (a∼0.9M), it turns out that 4.31M≤Ra≤6.08M, 1≤Ds≤1.33; for Sgr A*, 4.3M≤Ra≤5.5M. At θo=50∘, Sgr A* yields 1.021≤b0≤1.1 and a∈(0.05003M,0.7124M); whereas for M87* at θo=17∘, we find that 0.9985≤b0≤1.1 and a∈(0.04961M,0.7464M). The bounds on RQBH parameters obtained from the EHT results of SgrA * are more stringent than those obtained from the EHT image of M87*. We also compute the energy emission rate, revealing enhanced high-frequency emission from quantum effects. These results offer testable LQG signatures and connect quantum gravity with BH imaging, providing a framework for comparing polymerized BHs with observations. Thus, suggest that RQBHs are viable candidates for astrophysical black holes.
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Center for Theoretical Physics, Khazar University, 41 Mehseti Street, Baku, AZ1096, Azerbaijan
Centre for Research Impact & Outcome, Chitkara University Institute of Engineering and Technology, Chitkara University, Punjab, Rajpura, 140401, India
Institute of Nuclear Physics, Ibragimova, 1, Almaty, 050032, Kazakhstan
Department of Mathematical and Physical Sciences, College of Arts and Sciences, University of Nizwa, P.O. Box 33, Nizwa, 616, Oman
Centre for Theoretical Physics, Jamia Millia Islamia, New Delhi, 110 025, India
Astrophysics and Cosmology Research Unit, University of KwaZulu-Natal, Durban, South Africa
Al-Farabi Kazakh National University, Al-Farabi av. 71, Almaty, 050040, Kazakhstan
Kazakh-British Technical University, Tole bi str., 59, Almaty, 050000, Kazakhstan
Center for Theoretical Physics
Centre for Research Impact & Outcome
Institute of Nuclear Physics
Department of Mathematical and Physical Sciences
Centre for Theoretical Physics
Astrophysics and Cosmology Research Unit
Al-Farabi Kazakh National University
Kazakh-British Technical University
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Книга Публикация научной статьи Волощук 2026 Book Publication of a scientific article 2026