Abstract
The third-order nonlinear dispersion PDE, as the key model,
is studied. Two Riemann’s problems for (0.1) with the initial data S ∓(x) = ∓ sgn.x create shock (u(x, t) ≡ S −(x)) and smooth rarefaction (for the data S +) waves (see [16]). The concept of “δ-entropy” solutions and others are developed for establishing the existence and uniqueness for (0.1) by using stable smooth δ-deformations of shock-type solutions. These are analogous to entropy theory for scalar conservation laws such as u t + uu x = 0, which were developed by Oleinik and Kruzhkov (in x ∊ ℝN) in the 1950s–1960s. The Rosenau-Hyman K(2, 2) (compacton) equation
which has a special importance for applications, is studied. Compactons as compactly supported travelling wave solutions are shown to be δ-entropy. Shock and rarefaction waves are discussed for other NDEs such as
.
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Dedicated to the memory of Professors O.A. Oleinik and S.N. Kruzhkov
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Galaktionov, V.A. Nonlinear dispersion equations: Smooth deformations, compactions, and extensions to higher orders. Comput. Math. and Math. Phys. 48, 1823–1856 (2008). https://doi.org/10.1134/S0965542508100084
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DOI: https://doi.org/10.1134/S0965542508100084