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arXiv · 2607.19863

Quasinormal modes of scalar and Maxwell field perturbations coupled to the Einstein tensor in generalized Nariai spacetimes

Xin Qin·Xiongying Qiao·Qiyuan Pan·Xiangyun Fu·Xuan Zhou·Ying Yang
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Abstract

We investigate the quasinormal modes of scalar and Maxwell field perturbations coupled to the Einstein tensor in generalized Nariai spacetimes. Our results show that, for both types of perturbations, the coupling introduces different critical values, which separate the frequency spectrum into distinct branches. Near these critical values, the square-root term that determines $\omega_R^2$ may change sign, giving rise to a parameter interval in which the modes are purely imaginary. Away from this regime, the coupling affects the oscillatory parts of the two fields in opposite ways: $\omega_R^2$ generally increases with the coupling constant $\eta$ for the scalar field, whereas it decreases with $\eta$ for the Maxwell field. The magnetic charge tends to enhance the oscillatory response, while increasing the spacetime dimension narrows the purely imaginary regime. This comparison shows analytically that the same curvature coupling can affect scalar and Maxwell perturbations in qualitatively different ways.

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Xin Qin, Xiongying Qiao, Qiyuan Pan, Xiangyun Fu, Xuan Zhou, Ying Yang. 2026-07-22. Quasinormal modes of scalar and Maxwell field perturbations coupled to the Einstein tensor in generalized Nariai spacetimes. https://arxiv.org/abs/2607.19863

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