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Keywords = Einstein–Maxwell–Dilaton gravity

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17 pages, 2190 KB  
Article
Quasinormal Modes for Charged Lifshitz Black Holes with Scalar Hair
by Xufen Zhang, Shan Wu, Rui-Hong Yue, De-Cheng Zou and Ming Zhang
Universe 2025, 11(9), 317; https://doi.org/10.3390/universe11090317 - 13 Sep 2025
Viewed by 188
Abstract
In this paper, we investigate massive charged scalar perturbations in four-dimensional charged Lifshitz–AdS black holes with scalar hair within the framework of Einstein–Maxwell–Dilaton (EMD) gravity. Using the improved asymptotic iteration method (AIM), we compute the quasinormal modes (QNMs) and explore their dependence on [...] Read more.
In this paper, we investigate massive charged scalar perturbations in four-dimensional charged Lifshitz–AdS black holes with scalar hair within the framework of Einstein–Maxwell–Dilaton (EMD) gravity. Using the improved asymptotic iteration method (AIM), we compute the quasinormal modes (QNMs) and explore their dependence on key parameters, including the Lifshitz dynamical exponent z, the scalar field mass and charge, and the black hole charge, under various spatial curvature settings (k=0,±1). Our results reveal rich and sensitive behavior in both the real and imaginary parts of the QNMs. In particular, the decay rates can exhibit monotonic or non-monotonic dependence on the black hole charge, depending on the values of z, ms, and qs. These findings highlight the significant role of field and geometric parameters in governing the dynamical stability of Lifshitz black holes and offer insights into the perturbative properties of non-AdS holographic systems. Full article
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30 pages, 2037 KB  
Article
Probing Modified Gravity Theories with Scalar Fields Using Black-Hole Images
by Georgios Antoniou, Alexandros Papageorgiou and Panagiota Kanti
Universe 2023, 9(3), 147; https://doi.org/10.3390/universe9030147 - 11 Mar 2023
Cited by 13 | Viewed by 2981
Abstract
We study a number of well-motivated theories of modified gravity with the common overarching theme that they predict the existence of compact objects, such as black holes and wormholes endowed with scalar hair. We compute the shadow radius of the resulting compact objects [...] Read more.
We study a number of well-motivated theories of modified gravity with the common overarching theme that they predict the existence of compact objects, such as black holes and wormholes endowed with scalar hair. We compute the shadow radius of the resulting compact objects and demonstrate that black hole images, such as that of M87* or the more recent SgrA* by the Event Horizon Telescope (EHT) collaboration, could provide a powerful way to constrain deviations of the metric functions from what is expected from general relativity (GR) solutions. We focus our attention on Einstein-scalar-Gauss–Bonnet (EsGB) theory with three well-motivated couplings, including the dilatonic and Z2 symmetric cases. We then analyze the shadow radius of black holes in the context of the spontaneous scalarization scenario within EsGB theory with an additional coupling to the Ricci scalar (EsRGB). Finally, we turn our attention to spontaneous scalarization in the Einstein–Maxwell-Scalar (EMS) theory and demonstrate the impact of the parameters on the black hole shadow. Our results show that black hole imaging is an important tool for constraining black holes with scalar hair, and, for some part of the parameter space, black hole solutions with scalar hair may be marginally favored compared to solutions of GR. Full article
(This article belongs to the Section Gravitation)
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10 pages, 350 KB  
Communication
Constructing Higher-Dimensional Exact Black Holes in Einstein-Maxwell-Scalar Theory
by Jianhui Qiu and Changjun Gao
Universe 2020, 6(9), 148; https://doi.org/10.3390/universe6090148 - 9 Sep 2020
Cited by 4 | Viewed by 2001
Abstract
We construct higher-dimensional and exact black holes in Einstein-Maxwell-scalar theory. The strategy we adopted is to extend the known, static and spherically symmetric black holes in the Einstein-Maxwell dilaton gravity and Einstein-Maxwell-scalar theory. Then we investigate the black hole thermodynamics. Concretely, the generalized [...] Read more.
We construct higher-dimensional and exact black holes in Einstein-Maxwell-scalar theory. The strategy we adopted is to extend the known, static and spherically symmetric black holes in the Einstein-Maxwell dilaton gravity and Einstein-Maxwell-scalar theory. Then we investigate the black hole thermodynamics. Concretely, the generalized Smarr formula and the first law of thermodynamics are derived. Full article
(This article belongs to the Special Issue Modified Theories of Gravity and Cosmological Applications)
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