采用6阶WKB方法，研究了带有整体单极子的Reissner-Nordström de Sitter黑洞时空中无质量狄拉克场扰动的似正规模。数值结果显示，该黑洞时空中无质量狄拉克场的似正规模频谱取决于黑洞的有效电荷Q和有效质量M、宇宙学常数Λ以及表征对称性破缺的标度因子η。对于确定的|κ|、模数n、宇宙学常数Λ和b(和η有关)，无质量狄拉克场的衰减在宇宙学常数Λ比较小时是随着Q的增加先变快后变慢，而当宇宙学常数比较大时，则是随着Q的增加而变快。对于确定的|κ|、n、Q和b，无质量狄拉克场的衰减随着Λ的增加而变慢。%Using the sixth order WKB method, we investigate the massless Dirac quasinormal modes of Reissner-Nordström de Sitter black hole with a global monopole. The numerical results show that the massless Dirac quasinormal frequencies of the black hole space-time depend onthe effective chargeQ and the effective mass M of the black hole, cosmological constantΛ and the scale factor of symmetry-brokingη. For fixed|κ|,overtonen, cosmological constantΛ andb (related toη),when cosmological constantΛ is small, the damping of massless Dirac fieldis more and more fast at first and becomes more and more slow afterwards with the increase of Q, while Λ is large, the damping of massless Dirac field becomes more and more fast all the time with the increase ofQ. For fixed|κ|,n,Q andb, the massless Dirac field damps more and more slowly asΛ increases.
展开▼
