Black holes surrounded by a Murnaghan-fluid scalar gas in a global-monopole background
Sekhmani Y. Maurya S.K. Rayimbaev J. Ali A. Jasim M.K. Ibragimov I. Muminov S.
December 2025Elsevier B.V.
Physics of the Dark Universe
2025#50
We present a detailed comparative analysis of scalar and electromagnetic quasinormal modes (QNMs) for a new static black hole (BH) spacetime solution, which is surrounded by a Murnaghan-type fluid and a global monopole. By combining effective potential diagnostics with Wentzel-Kramers-Brillouin (WKB)-Padé-computed quasinormal mode (QNM) spectra, we demonstrate that the scalar channel whose effective potential contains metric-derivative terms is susceptible to the fluid’s nonlinear parameters λ , Γ, β . In this channel, increasing λ or Γ raises and sharpens the photon-sphere barrier, producing higher oscillation frequencies and larger damping rates, while increasing β lowers and broadens the barrier, reducing frequency and prolonging mode lifetimes. The electromagnetic channel, dominated by the centrifugal barrier, i.e., |gtt|ℓ(ℓ+1)/r2, is comparatively insensitive to derivative-driven fluid structure and instead responds primarily to the monopole parameter η : larger η yields a net redshift that lowers Re( ω ) and reduces damping, making electromagnetic ringing longer-lived. These complementary sensitivities suggest that combined scalar and electromagnetic spectroscopy can disentangle local fluid stiffness from global redshift effects, with implications for BH stability analyses and potential observational probes of exotic matter surrounding compact objects. In addition, sech-based greybody bounds reveal a consistent relationship with the trends observed in QNM and effective potentials. Specifically, within the parameter ranges examined, it is clear that the strength of the global monopole has a minimal effect on the greybody bounds in the scalar channel.
Black hole , Global monopole , Murnaghan EoS , WKB-Padé approximation
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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 & 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, Nizwa 616, P.O. Box 33, Oman
Urgench State University, Kh. Alimjan Str. 14, Urgench, 221100, Uzbekistan
University of Tashkent for Applied Sciences, Str. Gavhar 1, Tashkent, 100149, Uzbekistan
National University of Uzbekistan, Tashkent, 100174, Uzbekistan
Tashkent State Technical University, Tashkent, 100095, Uzbekistan
Department of Mathematics, College of Sciences, King Khalid University, Abha, 61413, Saudi Arabia
Kimyo International University in Tashkent, Shota Rustaveli street 156, Tashkent, 100121, Uzbekistan
Mamun University, Bolkhovuz Street 2, Khiva, 220900, Uzbekistan
Center for Theoretical Physics
Centre for Research Impact & Outcome
Institute of Nuclear Physics
Department of Mathematical and Physical Sciences
Urgench State University
University of Tashkent for Applied Sciences
National University of Uzbekistan
Tashkent State Technical University
Department of Mathematics
Kimyo International University in Tashkent
Mamun University
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