|
Professor of Integrable Systems in Mathematical Physics, University of Crete Member, Institute of Applied and Computational Mathematics, Foundation for Research & Technology - Hellas (FORTH) Office: Δ338, Mathematics Building, 70013 Voutes, Greece Tel: +30 2810 393714 E-mail: Spyridon "dot" Kamvissis "at" amias "dot" ias "dot" edu |
|
Ph.D., Courant Institute, 1991
Habilitation, University of Paris 7, 1996
My research has focused mostly on infinite dimensional Hamiltonian systems that admit a Lax pair or a zero curvature condition and can be studied via an inverse scattering/spectral method. I have been particularly interested in mathematically rigorous treatments of asymptotic problems like the investigation of long time asymptotics,
semiclassical high frequency asymptotics, zero dispersion limits and continuum limits of solutions of initial and
initial-boundary value problems for nonlinear dispersive partial differential equations
and nonlinear lattices, with particular attention to delicate "universal model" problems displaying intricate instabilities.
I have used and extended techniques from PDE theory, complex analysis, harmonic analysis,
potential theory and algebraic geometry. Along the way, I have made contributions to the analysis of
Riemann-Hilbert factorisation problems on the complex plane or a hyperelliptic Riemann surface and the
related theory of variational problems for Green potentials with harmonic external fields.
In a sense I have worked on a "nonlinear/non-commutative microlocal analysis" that
generalises the classical theory of stationary phase and steepest descent;
for a detailed exposition of this point of view see this review article.
One motivation for this line of research is the conviction that unstable behavior should be first understood in the context of "integrable" theory because of the
ubiquity and importance of such models before a more general theory is (if ever) available.
Instability should not be avoided as something ill-posed and unphysical,
but rather its study should be encouraged even for practical reasons: unstable behavior (whose existence is ubiquitous) is exactly where numerical observations fail.
Spyridon Kamvissis, Gerald Teschl, Stability of Periodic Soliton Equations under Short Range Perturbations, Phys. Lett. A 364-6, 480-483 (2007)
Spyridon Kamvissis, A Riemann-Hilbert Problem in a Riemann Surface; invited contribution to a volume honoring P.D.Lax on his 85th birthday, Acta Mathematica Scientia, v.31, n.6, November 2011, pp. 2233-2246.
Spyridon Kamvissis, Gerald Teschl, Long Time Asymptotics of the Periodic Toda Lattice under Short Range Perturbations, Journal of Mathematical Physics, v.53, n.7, 2012
D. C. Antonopoulou, S. Kamvissis, On the Dirichlet to Neumann Problem for the 1-dimensional Cubic NLS Equation on the Half-Line, Nonlinearity 28 (2015) 3073-3099 + Addendum (2016)
A.F.Pallas Analysis Prize of the Academy of Athens (2016)
Setsuro Fujiie, Spyridon Kamvissis, Semiclassical WKB problem for the non-self-adjoint Dirac operator with analytic potential, Journal of Mathematical Physics, v.61, n.1, 011510, 2020
Nicholas Hatzizisis, Spyridon Kamvissis, Semiclassical WKB problem for the non-self-adjoint Dirac operator with a decaying potential, Journal of Mathematical Physics, v.62, n.3, 033510, 2021
Nicholas Hatzizisis, Spyridon Kamvissis, Semiclassical WKB Problem for the Non-Self-Adjoint Dirac
Operator with a Multi-Humped Decaying Potential, arXiv 2106.07253
Setsuro Fujiie, Nicholas Hatzizisis, Spyridon Kamvissis, Semiclassical WKB Problem for the non-self-adjoint Dirac operator with an analytic rapidly oscillating potential, arXiv 2204.07089