3 papers
gr-qc2026
Coexistence of Spectrally Stable and Unstable Modes in Black Hole Ringdowns
Peng Wang, Tianshu Wu
Recent studies have shown that a secondary potential barrier, forming a potential well outside the event horizon, can destabilize the Quasinormal Mode (QNM) spectrum of black holes…
gr-qc2024
Spin-induced Scalar Clouds around Kerr-Newman Black Holes
Guangzhou Guo, Peng Wang, Tianshu Wu +1
Recent studies have demonstrated that a scalar field non-minimally coupled to the electromagnetic field can experience a spin-induced tachyonic instability near Kerr-Newman black h…
gr-qc2024
Stationary Scalar Clouds around Kerr-Newman Black Holes
Guangzhou Guo, Peng Wang, Tianshu Wu +1
This study investigates scalar clouds around Kerr-Newman black holes within the Einstein-Maxwell-scalar model. Tachyonic instabilities are identified as the driving mechanism for s…