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No indications of metal-insulator transition for systems of interacting electrons in two dimensions
Richard Berkovits, Jan W. Kantelhardt, Yshai Avishai +2
The influence of Coulomb interaction on transport properties of spinless electrons in small disordered two dimensional systems is studied within a tight binding model. Spatial corr…
Average Time Spent by Levy Flights and Walks on an Interval with Absorbing Boundaries
S. V. Buldyrev, S. Havlin, A. Ya. Kazakov +4
We consider a Levy flyer of order alpha that starts from a point x0 on an interval [O,L] with absorbing boundaries. We find a closed-form expression for the average number of fligh…
Characterization of Sleep Stages by Correlations of Heartbeat Increments
Jan W. Kantelhardt, Yosef Ashkenazy, Plamen Ch. Ivanov +5
We study correlation properties of the magnitude and the sign of the increments in the time intervals between successive heartbeats during light sleep, deep sleep, and REM sleep us…
Universality of the Directed Polymer Model
Ehud Perlsman, Shlomo Havlin
The universality of the directed polymer model and the analogous KPZ equation is supported by numerical simulations using non-Gaussian random probability distributions in two, thre…
Entropy fluctuations for directed polymers in 2+1 dimensions
Xiao-Hong Wang, Shlomo Havlin, Moshe Schwartz
We find numerically that the sample to sample fluctuation of the entropy, , is a tool more sensitive in distinguishing how from high temperature behaviors, than the correspondi…
Breakdown of the Internet under intentional attack
Reuven Cohen, Keren Erez, Daniel ben-Avraham +1
We study the tolerance of random networks to intentional attack, whereby a fraction p of the most connected sites is removed. We focus on scale-free networks, having connectivity d…