Quasimodes and a lower bound for the local energy decay of the Dirac   equation in Schwarzschild-Anti-de Sitter spacetime
  We prove the existence of exponentially accurate quasimodes using the square of the Dirac operator on the Schwarzschild-Anti-de Sitter spacetime and the Agmon estimates. We then deduce a logarithmic lower bound for the local energy decay of the Dirac propagator. 
Guillaume Idelon-Riton
math-ph math.MP