Abstract
In this paper we construct unstable shocks in the context of 2D isentropic compressible Euler in azimuthal symmetry. More specifically, we construct initial data that when viewed in self-similar coordinates, converges asymptotically to the unstable \(C^{\frac{1}{5}}\) self-similar solution to the Burgers’ equation. Moreover, we show the behavior is stable in \(C^8\) modulo a two dimensional linear subspace. Under the azimuthal symmetry assumption, one cannot impose additional symmetry assumptions in order to isolate the corresponding manifold of initial data leading to stability: rather, we rely on modulation variable techniques in conjunction with a Newton scheme.
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Communicated by K. Nakanishi
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Tristan Buckmaster partially supported by NSF Grant DMS-1900149 and a Simons Foundation Mathematical and Physical Sciences Collaborative Grant. Sameer Iyer partially supported by NSF Grant DMS-1802940.
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Buckmaster, T., Iyer, S. Formation of Unstable Shocks for 2D Isentropic Compressible Euler. Commun. Math. Phys. 389, 197–271 (2022). https://doi.org/10.1007/s00220-021-04271-z
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DOI: https://doi.org/10.1007/s00220-021-04271-z