Speaker
Description
In this work, we investigate the stability of geodesic orbits around a regular hairy black hole within the framework of gravitational decoupling. The analysis is performed through Lyapunov exponents, which quantify the divergence rate of nearby trajectories in dynamical systems. Both timelike and null geodesics are considered to explore the impact of the hair parameter on orbital stability. Deviations from the Schwarzschild geometry are shown to significantly affect the dynamics of test particles, potentially leading to observable signatures. Additionally, we compute the quasinormal modes of regular hairy black holes to further probe their stability and dynamical response. Interestingly, we explore the role of the hair parameter as a possible mimicker of the spin parameter in rotating black holes, motivated by the observed similarities between their effects on geodesic motion.