2,550 research outputs found
Dynamics of horizontal-like maps in higher dimension
We study the regularity of the Green currents and of the equilibrium measure
associated to a horizontal-like map in C^k, under a natural assumption on the
dynamical degrees. We estimate the speed of convergence towards the Green
currents, the decay of correlations for the equilibrium measure and the
Lyapounov exponents. We show in particular that the equilibrium measure is
hyperbolic. We also show that the Green currents are the unique invariant
vertical and horizontal positive closed currents. The results apply, in
particular, to Henon-like maps, to regular polynomial automorphisms of C^k and
to their small pertubations.Comment: Dedicated to Professor Gennadi Henkin on the occasion of his 65th
birthday, 37 pages, to appear in Advances in Mat
Influence of Coulomb interaction on the Aharonov-Bohm effect in an electronic Fabry-Perot interferometer
We study the role of Coulomb interaction in an electronic Fabry-Perot
interferometer (FPI) realized with chiral edge states in the integer quantum
Hall regime in the limit of weak backscattering. Assuming that a compressible
Coulomb island in a bulk region of the FPI is formed, we develop a capacitance
model which explains the plethora of experimental data on the flux and gate
periodicity of conductance oscillations. It is also shown that a suppression of
finite-bias visibility stems from a combination of weak Coulomb blockade and a
nonequilibrium dephasing by the quantum shot noise
Calculation of the hyperfine structure of the superheavy elements Z=119 and Z=120+
The hyperfine structure constants of the lowest and states of
superheavy elements Z=119 and Z= 120 are calculated using {\em ab initio}
approach. Core polarization and dominating correlation effects are included to
all orders. Breit and quantum electrodynamic effects are also considered.
Similar calculations for Cs, Fr, Ba and Ra are used to control the
accuracy. The dependence of the hyperfine structure constants on nuclear radius
is discussed.Comment: 4 pages, 3 tables, no figure
On the Design of Secure Full-Duplex Multiuser Systems under User Grouping Method
Consider a full-duplex (FD) multiuser system where an FD base station (BS) is
designed to simultaneously serve both downlink users and uplink users in the
presence of half-duplex eavesdroppers (Eves). Our problem is to maximize the
minimum secrecy rate (SR) among all legitimate users by proposing a novel user
grouping method, where information signals at the FD-BS are accompanied with
artificial noise to degrade the Eves' channel. The SR problem has a highly
nonconcave and nonsmooth objective, subject to nonconvex constraints due to
coupling between the optimization variables. Nevertheless, we develop a
path-following low-complexity algorithm, which invokes only a simple convex
program of moderate dimensions at each iteration. We show that our
path-following algorithm guarantees convergence at least to a local optima. The
numerical results demonstrate the merit of our proposed approach compared to
existing well-known ones, i.e., conventional FD and nonorthogonal multiple
access.Comment: 6 pages, 3 figure
Validation of the 3-under-2 principle of cell wall growth in Gram-positive bacteria by simulation of a simple coarse-grained model
The aim of this work is to propose a first coarse-grained model of Bacillus
subtilis cell wall, handling explicitly the existence of multiple layers of
peptidoglycans. In this first work, we aim at the validation of the recently
proposed "three under two" principle.Comment: Revised introduction, results unchange
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