We demonstrate that linear degeneracy is a necessary condition for quasilinear systems of Jordan block type to possess first-order Hamiltonian structures. Multi-Hamiltonian formulation of linearly degenerate systems governing delta-functional reductions of the kinetic equation for dense soliton gas is established (for KdV, sinh-Gordon, hard-rod, Lieb-Liniger, DNLS, and separable cases).
Funding
GNFM of the Istituto Nazionale di Alta Matematica (INdAM)
Research project Mathematical Methods in Non-Linear Physics (MMNLP)
Commissione Scientifica Nazionale – Gruppo 4 – Fisica Teorica of the Istituto Nazionale di Fisica Nucleare (INFN)
PRIN 2017 “Multiscale phenomena in Continuum Mechanics: singular limits, off-equilibrium and transitions”, project number 2017YBKNCE
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in P. Vergallo, E. V. Ferapontov; Hamiltonian systems of Jordan block type: Delta-functional reductions of the kinetic equation for soliton gas. J. Math. Phys. 1 October 2023; 64 (10): 103505. https://doi.org/10.1063/5.0142689 and may be found at https://doi.org/10.1063/5.0142689.