2005/09/12 by Alex Buchel · 1 citation
Mathematics · Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Gauge theory #Geometry #High-Energy Particle Collisions Research #Mathematical physics #Mathematics #Physics #Quantum electrodynamics #Quantum mechanics #String theory #Supergravity #Supersymmetry #Tensor (intrinsic definition) #Theoretical physics #Viscosity #Volume viscosity #hep-th #nucl-th
paper · pdf · doi:10.1103/physrevd.72.106002
published as Phys.Rev.D72:106002,2005 · 30 pages, (18 pages + appendicies), latex
arxiv created 2005/09/12 · openalex publication_date 2005/11/02 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Cascading gauge theories of Klebanov et al. provide a model within a framework of gauge theory/string theory duality for a four-dimensional nonconformal gauge theory with a spontaneously generated mass scale. Using the dual supergravity description, we study sound wave propagation in strongly coupled cascading gauge theory plasma. We analytically compute the speed of sound and the bulk viscosity of cascading gauge theory plasma at a temperature much larger than the strong coupling scale of the theory. The sound wave dispersion relation is obtained from the hydrodynamic pole in the stress-energy tensor two-point correlation function. The speed of sound extracted from the pole of the correlation function agrees with its value computed in Phys. Rev. D 72, 066003 (2005), using the equation of state. We find that the bulk viscosity of the hot cascading gauge theory plasma is nonzero at the leading order in the deviation from conformality.