6 papers
Rapid Energy Dissipation by Colliding Waves in Strongly Magnetized Plasmas
Tianshu Wu, Xinyu Li, Yangyang Cai
Rapid dissipation of magnetic energy in highly magnetized environments around neutron stars and black holes is a key open question in high-energy astrophysics. We develop a general…
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…
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…
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…
Distinguishing the Observational Signatures of Hot Spots Orbiting Reissner-Nordström Spacetime
Tianshu Wu, Yiqian Chen
This paper delves into observable signatures of hot spots orbiting Reissner-Nordström (RN) black holes and naked singularities. In a RN black hole case, we find two discernible len…
Gravitational Lensing by Transparent Janis-Newman-Winicour Naked Singularities
Deyou Chen, Yiqian Chen, Peng Wang +2
The Janis-Newman-Winicour (JNW) spacetime can describe a naked singularity with a photon sphere that smoothly transforms into a Schwarzschild black hole. Our analysis reveals that…