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In this paper, we study blow ups of solutions to the second sound equation ∂_t^2u=u∂_x(u∂_xu), which is more natural than the second sound equation in Landau-Lifshitz's text in large time. We assume t...hat the initial data satisfies u(0,x)≥ δ>0 for some δ. We give sufficient conditions that two types of blow up occur: one of the two types is that L^∞-norm of ∂_tu or ∂_xu goes up to the infinity; the other type is that u vanishes, that is, the equation degenerates.続きを見る
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