Integrable discrete nets in Grassmannians

We consider discrete nets in Grassmannians $\mathbb{G}^d_r$ which generalize Q-nets (maps $\mathbb{Z}^N\to\mathbb{P}^d$ with planar elementary quadrilaterals) and Darboux nets ($\mathbb{P}^d$-valued maps defined on the edges of $\mathbb{Z}^N$ such that quadruples of points corresponding to elementary squares are all collinear). We give a geometric proof of integrability (multidimensional consistency) of these novel nets, and show that they are analytically described by the noncommutative discrete Darboux system.Comment: 10 p

Breather lattice and its stabilization for the modified Korteweg-de Vries equation

We obtain an exact solution for the breather lattice solution of the modified Korteweg-de Vries (MKdV) equation. Numerical simulation of the breather lattice demonstrates its instability due to the breather-breather interaction. However, such multi-breather structures can be stabilized through the concurrent application of ac driving and viscous damping terms.Comment: 6 pages, 3 figures, Phys. Rev. E (in press

Generalized Darboux and Darboux-Levi transformations in 2+1 dimensions

SIGLEAvailable from British Library Document Supply Centre- DSC:DX174572 / BLDSC - British Library Document Supply CentreGBUnited Kingdo

Integrable discretization of hodograph-type systems,hyperelliptic integrals and Whitham equations

Discrete analogues of important objects and notions in the theory of semi-Hamiltonian systems of hydrodynamic type are presented