Quasinormal ringing of thick braneworlds with a finite extra dimension
arXiv:2406.03929 · doi:10.1103/PhysRevD.110.064077
Abstract
In this work, we investigate the quasinormal modes of the Poincaré thick brane with a finite extra dimension. Unlike the case with an infinite extra dimension, the gravitational effective potential exhibits three distinct shapes within different ranges of the parameter in the warp factor: harmonic oscillator potential, Pöschl-Teller potential, and volcano-like potential. We then study various types of perturbations in this system. Utilizing a combination of analytical, semi-analytical, and numerical methods, we obtain the quasinormal modes of the perturbed fields. Our findings reveal a set of discrete quasinormal modes for the thick brane, similar to those of black holes. Interestingly, when , the quasinormal modes exhibit purely imaginary behavior. This study may provide a new way to detect the existence of extra dimensions.
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