Author:
Giri Ratan Kr.,Kinnunen Juha,Moring Kristian
Abstract
AbstractWe study a generalized class of supersolutions, so-called p-supercaloric functions, to the parabolic p-Laplace equation. This class of functions is defined as lower semicontinuous functions that are finite in a dense set and satisfy the parabolic comparison principle. Their properties are relatively well understood for $$p\ge 2$$
p
≥
2
, but little is known in the fast diffusion case $$1<p<2$$
1
<
p
<
2
. Every bounded p-supercaloric function belongs to the natural Sobolev space and is a weak supersolution to the parabolic p-Laplace equation for the entire range $$1<p<\infty $$
1
<
p
<
∞
. Our main result shows that unbounded p-supercaloric functions are divided into two mutually exclusive classes with sharp local integrability estimates for the function and its weak gradient in the supercritical case $$\frac{2n}{n+1}<p<2$$
2
n
n
+
1
<
p
<
2
. The Barenblatt solution and the infinite point source solution show that both alternatives occur. Barenblatt solutions do not exist in the subcritical case $$1<p\le \frac{2n}{n+1}$$
1
<
p
≤
2
n
n
+
1
and the theory is not yet well understood.
Publisher
Springer Science and Business Media LLC
Subject
Applied Mathematics,Analysis
Reference24 articles.
1. Bidaut-Véron, M.F.: Self-similar solutions of the $$p$$-Laplace heat equation: the fast diffusion case. Pac. J. Math. 227(2), 201–269 (2006)
2. Björn, A., Björn, J., Gianazza, U., Parviainen, M.: Boundary regularity for degenerate and singular parabolic equations. Calc. Var. Partial Differ. Equ. 52(3–4), 797–827 (2015)
3. Barenblatt, G.I.: On self-similar motions of a compressible fluid in a porous medium. Akad. Nauk SSSR. Prikl. Mat. Meh. 16, 679–698 (1952) ((in Russian))
4. Baroni, P.: Singular parabolic equations, measures satisfying density conditions, and gradient integrability. Nonlinear Anal. 153, 89–116 (2017)
5. Bögelein, V., Duzaar, F., Marcellini, P.: Existence of evolutionary variational solutions via the calculus of variations. J. Differ. Equ. 256(12), 3912–3942 (2014)
Cited by
2 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献