11,036 research outputs found
Generalized Superconductors and Holographic Optics - II
Using linear response theory, we analyze optical response properties of
generalized holographic superconductors, in AdS-Schwarzschild and single
R-charged black hole backgrounds in four dimensions. By introducing momentum
dependent vector mode perturbations, the response functions for these systems
are studied numerically, including the effects of backreaction. This
complements and completes the probe limit analysis for these backgrounds
initiated in our previous work ({\tt arXiv : 1305.6273}). Our numerical
analysis indicates a negative Depine-Lakhtakia index for both the backgrounds
studied, at low enough frequencies. The dependence of the response functions on
the backreaction parameter and the model parameters are established and
analyzed with respect to similar backgrounds in five dimensions.Comment: 1+26 Pages, 26 .eps figure
Three-Point Functions of Non-Unitary Minimal Matter Coupled to Gravity
The tree-level three-point correlation functions of local operators in the
general minimal models coupled to gravity are calculated in the
continuum approach. On one hand, the result agrees with the unitary series
(); and on the other hand, for , we find agreement with the
one-matrix model results.Comment: 14 page
On the time dependence of holographic complexity in a dynamical Einstein-dilaton model
We study the holographic "complexity=action'" (CA) and "complexity=volume"
(CV) proposals in Einstein-dilaton gravity in all spacetime dimensions. We
analytically construct an infinite family of black hole solutions and use CA
and CV proposals to investigate the time evolution of the complexity. Using the
CA proposal, we find dimensional dependent violation of the Lloyd bound in
early as well as in late times. Moreover, depending on the parameters of the
theory, the bound violation relative to the conformal field theory result can
be tailored in the early times as well. In contrast to the CA proposal, the CV
proposal in our model yields results similar to those obtained in the
literature.Comment: 33 pages, 27 figures, 1 table. Various typos corrected from the
previous version, references and discussion added. Altered to match published
versio
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