Some recent papers (abstracts, PDF and PostScript files):
- Recursion in curve geometry, New
York Journal of Mathematics, 5 (1999) 25-51.
Abstract: Recursion schemes are familiar in the theory of
soliton equations, e.g., in the discussion of infinite hierarchies
of conservation laws for such equations. Here we develop a variety
of special topics related to curves and curve evolution in two and
three-dimensional Euclidean space, with recursion as a
unifying theme. The interplay between curve geometry and soliton
theory is highlighted. Complete paper: PostScript,
PDF
- Straightening soliton curves, Applied
Math. Letters, to appear.
Abstract: A canonical straightening process is
described for soliton curves associated with the localized
induction hierarchy. Following computer animated examples (see
animated GIF Ribbon animation), the present
topic is placed in the context of a larger theme: the soliton
class is a natural setting for representation of diverse
topological and geometrical behavior of curves and their motions.
Complete paper: PostScript, PDF
- Taimanov's surface motion and a Backlund transformation
for curves, Conformal
Geometry and Dynamics, 3 (1999) 37-49 (with O.
Garay).
Abstract: Taimanov's evolution of conformally parametrized
surfaces in Euclidean space by the modified Novikov-Veselov
equation is interpreted here (in the revolution case) using
hyperbolic geometry and Backlund transformations for curves.
Complete paper: PostScript, PDF
- Geometric realizations of Fordy Kulish nonlinear
Schrodinger systems, Pacific
J. Math., to appear (with R.
Perline).
Abstract: A method of Sym and Pohlmeyer, which produces
geometric realizations of many integrable systems, is applied to
the Fordy-Kulish generalized non-linear Schrodinger
systems associated with Hermitian symmetric spaces. The
resulting geometric equations correspond to distinguished
arclength-parametrized curves evolving in a Lie algebra,
generalizing the localized induction model of vortex
filament motion. An appropriate specialization yields evolution
equations for curves in spheres and Euclidean space of any
dimension, with natural curvatures satisfying a generalized
mKdV system. Complete paper: PostScript,
PDF
Joel
Langer's home page