paper

Low-lying gravitational modes in the scalar sector of the global AdS_4 black hole

arXiv:hep-th/0612065 · doi:10.1088/1126-6708/2007/02/023

Abstract

We compute the quasinormal frequencies corresponding to the scalar sector of gravitational perturbations in the four-dimensional AdS-Schwarzschild black hole by using the master field formalism of hep-th/0305147. We argue that the non-deformation of the boundary metric favors a Robin boundary condition on the master field over the usual Dirichlet boundary condition mostly used in the literature. Using this Robin boundary condition we find a family of low-lying modes, whose frequencies match closely with predictions from linearized hydrodynamics on the boundary. In addition to the low-lying modes, we also see the usual sequence of modes with frequencies almost following an arithmetic progression.

23 pages, 3 figures; v2: typos corrected; v3: algebraic derivation of hydrodynamic modes corrected, results unaltered

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