We analyze a recently proposed continuous model for stress fields that develop in two-dimensional purely isostatic granular systems. We present a reformulation of the field equations, as a linear first-order hyperbolic system, and show that it is very convenient both for analysis and for...

Following the recently suggested vortex/antivortex-mediated pairing mechanism in La2-x(Sr)xCuO4, it is proposed here, as a possibility, that single holes, induced by low doping, reside in a symmetric double well potential (DWP), formed by the vortex/antivortex excitation. An oscillatory...

A nonlinear conducting continuum system with a negative dynamic resistance is studied. The metastable solutions to Maxwell's equations are proposed to consist of narrow fluxes of currents and their properties are discussed. In systems containing pinning impurities an array of fluxes appears and...

We study nonlinear dielectrics obeying D = ϵ(E2)β/2E. The solution to the eletrostatic equations is found to be unique for ∞ α = 1/(β + 1) 1/(d − 1). We find the electrostatic fields produced by a point charge and by an infinite charged slab in such a medium. Two definitions of the...