Aging is one of the simplest nonequilibrium and timedependent phenomena with three characteristic features: slow powerlaw decay, broken time translation and dynamical scaling. These features are realized in simple gravity backgrounds in the context of the Schroedinger holography. Schroedinger background realizes ``codimension two holography'' with two holographic coordinates. One is the usual radial coordinate. Another is responsible for the particle number, which is conserved in the nonrelativistic theories. This background has large symmetry group, called nonrelativistic conformal Schroedinger group. Aging symmetry is realized by removing only the time translation symmetry.
The above graph shows the initial powerlaw growth followed by another powerlaw behaviors depending on the parameters existing in our theory. It is interesting to point out that twotime autocorrelation functions of the theory can exhibit early powerlaw growth as well as the late aging decay. Motivated by the recent progress on KardarParisiZhang (KPZ) universality class and its experimental realization, we investigated the connection between aging and KPZ.

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S. Hyun, J. Jeong and B. S. Kim, “Aging Logarithmic Conformal Field Theory : a holographic view,” JHEP 1301, 141 (2013). [arXiv:1209.2417][hepth]

S. Hyun, J. Jeong and B. S. Kim, “Aging Logarithmic Galilean Field Theories,” Nucl. Phys. B 874, 358 (2013). [arXiv:1304.0007][hepth]