期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 2, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP02(2010)021
关键词
AdS-CFT Correspondence; Black Holes in String Theory
资金
- ME of Spain
- FEDER [FPA2008-01838]
- Spanish Consolider-Ingenio 2010 Programme CPAN [CSD2007-00042]
- Xunta de Galicia [PGIDIT06 PXIB206185Pz]
- FPU program
- Juan de la Cierva program
- Plan Nacional de Alta Energias [FPA-2006-05485]
- Comunidad de Madrid HEPHACOS [P-ESP-00346]
- Proyecto Intramural de CSIC [200840I257]
- German Research Foundation Deutsche Forschungsgemeinschaft (DFG)
We provide a framework for calculating holographic Green's functions from general bilinear actions and fields obeying coupled differential equations in the bulk. The matrix-valued spectral function is shown to be independent of the radial bulk coordinate, and hence, free from renormalization ambiguities. Applying this framework we improve the analysis of fluctuations in the D3/D7 system at finite baryon density, where the longitudinal perturbations of the world-volume gauge field couple to the scalar fluctuations of the brane embedding. We compute the spectral function and show how its properties are related to those of the quasinormal mode spectrum. We study the crossover from the hydrodynamic diffusive to the reactive regime and the movement of quasinormal modes as functions of temperature and density. We also compute their dispersion relations and find that they asymptote to the lightcone for large momenta.
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