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We study classical dynamics of a probe Dp-brane moving in a background sourced by a stack of Dp-branes. In this context the physics is similar to that of the effective action for open-string tachyon condensation, but with a power-law runaway potential. We show that small inhomogeneous ripples of the probe brane embedding grow with time, leading to folding(More)
Kovtun, Son and Starinets have conjectured that the viscosity to entropy density ratio η/s is always bounded from below by a universal multiple of i.e., /(4πk B) for all forms of matter. Mysteriously, the proposed viscosity bound appears to be saturated in all computations done whenever a supergravity dual is available. We consider the near horizon limit of(More)
In this paper we elaborate on the correspondence between the quantum Hall system with filling factor equal to one and the N = 4 SYM theory in the 1/2 BPS sector, previously mentioned in the [hep-th/0409174, 0409115]. We show the equivalence of the two in various formulations of the quantum Hall physics. We present an extension of the noncommutative(More)
ii To my mother, who has been with me every day of my life and to my wife Eli, who gave me l♥ve iii In the memory of our beloved friend and colleague the late Dr. Majid Abolhasani, who gave me some useful comments on the foundations of quantum mechanics, and was my initial encourager for working on quantum information theory. iv Acknowledgements It is a(More)
Due to their structural simplicity and superior generalization capability, Extended Classifier Systems (XCSs) are gaining popularity within the Artificial Intelligence community. In this study an improved XCS with continuous actions is introduced for function approximation purposes. The proposed XCSF uses " prediction zones, " rather than distinct "(More)