Abstract
We study quantitative compactness estimates in \({\mathbf{W}^{1,1}_{{\rm loc}}}\) for the map \({S_t}\), \({t > 0}\) that is associated with the given initial data \({u_0\in {\rm Lip} (\mathbb{R}^N)}\) for the corresponding solution \({S_t u_0}\) of a Hamilton–Jacobi equation
with a uniformly convex Hamiltonian \({H=H(p)}\). We provide upper and lower estimates of order \({1/\varepsilon^N}\) on the Kolmogorov \({\varepsilon}\)-entropy in \({\mathbf{W}^{1,1}}\) of the image through the map S t of sets of bounded, compactly supported initial data. Estimates of this type are inspired by a question posed by Lax (Course on Hyperbolic Systems of Conservation Laws. XXVII Scuola Estiva di Fisica Matematica, Ravello, 2002) within the context of conservation laws, and could provide a measure of the order of “resolution” of a numerical method implemented for this equation.
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Ancona, F., Cannarsa, P. & Nguyen, K.T. Quantitative Compactness Estimates for Hamilton–Jacobi Equations. Arch Rational Mech Anal 219, 793–828 (2016). https://doi.org/10.1007/s00205-015-0907-5
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DOI: https://doi.org/10.1007/s00205-015-0907-5