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Unstable shock formation of the Burgers-Hilbert equation
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abstract
This paper proves the existence of unstable shocks of the Burgers-Hilbert equation conjectured in arXiv:2006.05568. More precisely, we construct smooth initial data with finite $H^9$-norm such that the solution in self-similar coordinates is asymptotic to the first unstable solution to the self-similar inviscid Burgers equation. The blowup profile is a cusp with H\"older 1/5 continuity with explicit blowup time and location. Unlike the previously established stable shocks, the initial data cannot be taken in an open set; instead, we control the two unstable directions by Newton's iteration.
Forward citations
Cited by 2 Pith papers
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Shock formation in 1D conservation laws I: Inviscid structure
Small perturbations of a large shocking simple wave in a strictly hyperbolic 1D conservation law still form a shock, with a universal inverse-cubic leading profile and a Lipschitz maximal development boundary.
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Shock formation in 1D conservation laws II: Vanishing viscosity
Viscous solutions of 1D conservation laws converge to the inviscid preshock at sharp rate nu^{1/4} in L∞, with Hölder thresholds 1/3 for the shocking and 2/3 for the nonshocking component, and a universal viscous Burg...
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