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“School of Physics”

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Paper   IPM / P / 14680
School of Physics
  Title:   Far-from-equilibrium initial conditions probed by a nonlocal operator
  Author(s): 
1 . L. Shahkarami
2 . M. Ali-Akbari
3 . F. Charmchi
4 . H. Ebrahim
  Status:   Published
  Journal: Phys. Lett. B
  Vol.:  773
  Year:  2017
  Pages:   91
  Supported by:  IPM
  Abstract:
Using the gauge/gravity duality, we investigate the evolution of a strongly-coupled plasma which is initially anisotropic and/or non-conformal, from the viewpoint of the two-point function of scalar gauge-invariant operators with large conformal dimension. Considering various functions for the initial anisotropy and scalar field, we conclude that the effect of the anisotropy on the evolution of the two-point function is considerably more than the effect of the scalar field. We also show that the ordering of the equilibration time of the equilibration time of one-point function of the scalar field and the correlation function between two points with a fixed separation can be reversed by changing the initial configuration of the plasma, when there are at least two sources for driving the system out of the equilibrium. In addition, we find the equilibration time of the two-point function to be linearly increasing with respect to the separation of the two points with a fixed slope, regardless of the initial configuration that we start with. Finally we observe that, for larger separations the geodesic connecting two points on the boundary crosses the event horizon after it has reached its final equilibrium value, meaning that the two-point function can probe behind the event horizon.

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