Quasinormal modes and tidal Love numbers of covariant effective quantum black holes with cosmological constant

Abstract: This paper systematically investigates the quasinormal modes (QNMs) and tidal Love numbers of covariant quantum-modified black holes (BHs) within two cosmological constant-dependent metric frameworks. By deriving axial/polar perturbation equations and employing pseudospectral methods (for QNMs) and numerical integration (for Love numbers), we quantify the quantum parameter $\zeta$'s influence. We find that, higher overtones exhibit enhanced $\zeta$ sensitivity. Solution 1 maintains purely imaginary QNMs under $\zeta$ variation, whereas Solution 2 demonstrates mode transitions from real to complex for polar/axial perturbations. Furthermore, for Love number, axial perturbations show non-monotonic $\zeta$ dependence, with $\Delta\mathcal{T}^a_l$ peaking at specific $\ell$ values before decay. While for polar perturbation of the same metric displays strictly monotonic $\zeta$ effects on $\Delta\mathcal{T}^p_l$. These results highlight quantum gravity's role in BH perturbation dynamics and cosmological BH phenomenology.