Massive scalar field perturbations in Weyl black holes

Abstract

In this work we consider the propagation of massive scalar fields in the background of Weyl black holes and we mainly study the effect of the scalar field mass in the spectrum of the quasinormal frequencies (QNFs) via the Wentzel-Kramers-Brillouin (WKB) method, and the pseudospectral Chebyshev method. The spectrum of QNFs is described by two families of modes, one of them is the photon sphere and the other one is the de Sitter. Essentially we show, via the WKB method, that the photon sphere modes exhibit an anomalous behaviour of the decay rate of the QNFs, that is, the longest-lived modes are the ones with higher angular number, as well as, there is a critical value of the scalar field mass, beyond which the anomalous behaviour is inverted. Also, we analyze the effect of the scalar field mass on each family of modes, and on their dominance, and we give an estimate value of the scalar field mass where the interchange in the dominance family occurs.