Massive Quasinormal Modes of a Schwarzschild-de Sitter Black Hole with a Global Monopole

Abstract

Using the WKB approximation, we evaluate both the massless and massive scalar and Dirac fields quasinormal modes (QNMs) of a Schwarzschild-de Sitter black hole. The result shows that the field with higher masses and larger cosmological constant lambda will decay more slowly. We also found that the global monopole is similar to a factor to modify the kappa of Dirac field or l of scalar field, where kappa is the angular momentum number of Dirac field, and l is the angular momentum number of scalar field.