W. Sajjad | Searcharxiv

arXiv2026

Quasinormal Modes, Greybody Factors and Rigorous Bounds for Quantum Oppenheimer-Snyder Black Hole with Quintessential Dark Energy and a String Clouds

We obtained quasinormal modes and greybody factors of the quantum Oppenheimer-Snyder (QOS) black hole with quintessential dark energy and string clouds. We compute the effective potentials of the scalar and the vector perturbation fields and analyze their graphical behavior. For this, we compute quasinormal mode frequencies of the QOS black hole, that is surrounded by quintessence dark energy and a cloud of strings and this is done by 6th-order Wentzel-Kramers-Brillouin (WKB) approximation method. We observe the quasinormal frequencies by analyzing both the quintessence parameters and the string cloud parameters. We also examine the GFs by analyzing the role of string cloud ($\tilde{a}_{e}$), quantum deformation ($\tilde{\sigma}_{e}$), and quintessence ($\tilde{h}_{e}$) parameters. It is found that GFs are significantly influenced by the parameters of $\tilde{a}_{e}$, $\tilde{\sigma}_{e}$, and $\tilde{h}_{e}$. In the case of scalar perturbation, we also give strict limits of the GFs and check the influence of the parameters of $\tilde{a}_{e}$, $\tilde{\sigma}_{e}$, and $\tilde{h}_{e}$.

gr-qc↗

arXiv2025

Study of Kiselev Black Hole in Quantum Fluctuation Modified Gravity via Quasinormal modes and Greybody Factors

In this work, we formulate the wave function to compute the effective potential of scalar and vector fields for the Kiselve black hole in the background of quantum fluctuation modified gravity. Using the 6th-order Wentzel-Kramers-Brillouin approach, the quasinormal modes for the considered black hole are obtained through scalar and vector perturbation fields. We investigate the quasinormal frequency by considering several values of the metric and equation of state ($\mho$ and $\bar{\bar{\omega}}$) parameter, respectively. The real part values of the quasinormal modes drop as the $\mho$ values rise. Later, the greybody factors of the black hole are determined and found that the parameters $\mho$, $\bar{\bar{\omega}}$ and the multipole moment $l$ significantly affects the greybody factors. Additionally, for scalar perturbations, we graphically analyze the rigorous bound of the greybody factor under the effects of parameters $\mho$ and $l$.

gr-qc↗