Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 4, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP04(2014)149
Keywords
Gauge-gravity correspondence; AdS-CFT Correspondence; Holography and condensed matter physics (AdS/CMT)
Categories
Funding
- National Science Foundation [PHY-1316033]
- Texas Cosmology Center
- FCT fellowship [SFRH/BI/52188/2013]
- FCT [PTDC/FIS/099293/2008, CERN/FP/116358/2010]
- Consolider-Ingenio Programme CPAN [C5D2007-00042]
- Xunta de Galicia [GRC2013-024]
- FEDER
- Juan de la Cierva program
- [FPA2011-22594]
- Fundação para a Ciência e a Tecnologia [SFRH/BI/52188/2013] Funding Source: FCT
- Direct For Mathematical & Physical Scien
- Division Of Physics [1316033] Funding Source: National Science Foundation
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In this paper, we study the fate of the holographic zero sound mode at finite temperature and non-zero baryon density in the deconfined phase of the Sakai-Sugimoto model of holographic QCD. We establish the existence of such a mode for a wide range of temperatures and investigate the dispersion relation, quasi-normal modes, and spectral functions of the collective excitations in four different regimes, namely, the collisionless quantum, collisionless thermal, and two distinct hydrodynamic regimes. For sufficiently high temperatures, the zero sound completely disappears, and the low energy physics is dominated by an emergent diffusive mode. We compare our findings to Landau-Fermi liquid theory and to other holographic models.
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