Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2009-09-09
JHEP 0911:119,2009
Physics
High Energy Physics
High Energy Physics - Theory
Revision: Results unchanged. More discussions on the model and on the results. References added. 28 pages, 7 figures, 5 tables
Scientific paper
10.1088/1126-6708/2009/11/119
We use the holographic AdS/QCD soft-wall model to investigate the spectrum of scalar glueballs in a finite temperature plasma. In this model, glueballs are described by a massless scalar field in an AdS_5 black hole with a dilaton soft-wall background. Using AdS/CFT prescriptions, we compute the boundary retarded Green's function. The corresponding thermal spectral function shows quasiparticle peaks at low temperatures. We also compute the quasinormal modes of the scalar field in the soft-wall black hole geometry. The temperature and momentum dependences of these modes are analyzed. The positions and widths of the peaks of the spectral function are related to the frequencies of the quasinormal modes. Our numerical results are found employing the power series method and the computation of Breit-Wigner resonances.
Ballon Bayona C. A.
Boschi-Filho Henrique
Braga Nelson R. F.
Miranda Alex S.
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