Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-06-19
JHEP 0709:057,2007
Physics
High Energy Physics
High Energy Physics - Theory
30 pages,9 figures v2: stability discussion in the appendix extended, references added
Scientific paper
10.1088/1126-6708/2007/09/057
We consider the effect of a periodic perturbation with frequency $\omega$ on the holographic N=4 plasma represented by the planar AdS black hole. The response of the system is given by exponentially decaying waves. The corresponding complex wave numbers can be found by solving wave equations in the AdS black hole background with infalling boundary conditions on the horizon in an analogous way as in the calculation of quasinormal modes. The complex momentum eigenvalues have an interpretation as poles of the retarded Green's functions, where the inverse of the imaginary part gives an absorption length $\lambda$. At zero frequency we obtain the screening length for a static field. These are directly related to the glueball masses in the dimensionally reduced theory. We also point out that the longest screening length corresponds to an operator with non-vanishing R-charge and thus does not have an interpretation as a QCD3 glueball.
Amado Irene
Hoyos Carlos
Landsteiner Karl
Montero Sergio
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