The holographic spectral function in non-equilibrium states
Feb, 2012
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Abstract: (arXiv)
We develop holographic prescriptions for obtaining spectral functions in non-equilibrium states and space-time dependent non-equilibrium shifts in the energy and spin of quasi-particle like excitations. We reproduce strongly coupled versions of aspects of non-equilibrium dynamics of Fermi surfaces in Landau's Fermi-liquid theory. We find that the incoming wave boundary condition at the horizon does not suffice to obtain a well-defined perturbative expansion for non-equilibrium observables. Our prescription, based on analysis of regularity at the horizon, allows such a perturbative expansion to be achieved nevertheless and can be precisely formulated in a universal manner independent of the non-equilibrium state, provided the state thermalizes. We also find that the non-equilibrium spectral function furnishes information about the relaxation modes of the system. Along the way, we argue that in a typical non-supersymmetric theory with a gravity dual, there may exist a window of temperature and chemical potential at large N, in which a generic non-equilibrium state can be characterized by just a finitely few operators with low scaling dimensions, even far away from the hydrodynamic limit.Note:
- revtex/ 43 pages, 2 figures/ typos corrected, accepted for publication in PRD
- 71.27.+a
- 11.25.Tq
- 25.75.Gz
- 04.20.Cv
- potential: chemical
- spectral representation
- holography
- boundary condition
- quasiparticle
- hydrodynamics
References(56)
Figures(2)