Abstract
This paper is devoted to present a detailed account of the asymptotic behaviour as t → ∞ of the solutions u(x, t) of the equation
with exponent m > 1, a range in which it is known as the porous medium equation written here PME for short. The study extends the well-known theory of the classical heat equation (HE, the case m = 1) into a nonlinear situation, which needs a whole set of new tools. The space dimension can be any integer n ≥ 1. We will also present the extension of the results to exponents m < 1 (fast-diffusion equation, Fde). For definiteness we consider the Cauchy Problem posed in Q = ℝn x ℝ+ with initial data
chosen in a suitable class of functions. In most of the paper we concentrate on the class X 0 of integrable and nonnegative data,
which is natural on physical grounds as the density or concentration of a diffusion process, the height of a ground-water mound, or the temperature of a hot medium (see a comment on the applications at the end). Consequently, we will deal mostly with nonnegative solutions u(x, t) ≥ 0 defined in Q. An existence and uniqueness theory exists for this problem so that for every data uo we can produce an orbit {u(·,t):t > 0} which lives in L 1 (ℝn) ∩ L ∞(ℝn) and describes the evolution of the process. The solution is not classical for m > 1, but it is proved that there exists a unique weak solution for all m > 0.
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Vázquez, J.L. (2003). Asymptotic behaviour for the porous medium equation posed in the whole space. In: Arendt, W., Brézis, H., Pierre, M. (eds) Nonlinear Evolution Equations and Related Topics. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-7924-8_5
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