Differential and Integral Equations

Self-similar solutions of a fast diffusion equation that do not conserve mass

M. A. Peletier and Hong Fei Zhang

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We consider self-similar solutions of the fast diffusion equation $u_t=\nabla\cdot(u^{-n}\nabla u)$ in $(0,\infty)\times\mathbb{R}^N$, for $N\geq3$ and $\frac2N<n<1$, of the form $ u(x,t) = (T-t)^\alpha f\left(\left|x\right|(T-t)^{-\beta}\right). $ Because mass conservation does not hold for these values of $n$, this results in a nonlinear eigenvalue problem for $f$, $\alpha$ and $\beta$. We employ phase plane techniques to prove existence and uniqueness of solutions $(f,\alpha,\beta)$, and we investigate their behaviour when $n\uparrow1$ and when $n\downarrow\frac2N$.

Article information

Differential Integral Equations, Volume 8, Number 8 (1995), 2045-2064.

First available in Project Euclid: 20 May 2013

Permanent link to this document

Mathematical Reviews number (MathSciNet)

Zentralblatt MATH identifier

Primary: 35K55: Nonlinear parabolic equations


Peletier, M. A.; Zhang, Hong Fei. Self-similar solutions of a fast diffusion equation that do not conserve mass. Differential Integral Equations 8 (1995), no. 8, 2045--2064. https://projecteuclid.org/euclid.die/1369056139

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