Geodesic
Recent results and open problems on parabolic equations with gradient nonlinearities
Electronic journal of differential equations, Tome 2001 (2001)
We survey recent results and present a number of open problems concerning the large-time behavior of solutions of semilinear parabolic equations with gradient nonlinearities. We focus on the model equation with a dissipative gradient term

$u_t-\Delta u=u^p-b|\nabla u|^q\,,$

where p, q > 1, b > 0, with homogeneous Dirichlet boundary conditions. Numerous papers were devoted to this equation in the last ten years, and we compare the results with those known for the case of the pure power reaction-diffusion equation (b=0). In presence of the dissipative gradient term a number of new phenomena appear which do not occur when b=0. The questions treated concern: sufficient conditions for blowup, behavior of blowing up solutions, global existence and stability, unbounded global solutions, critical exponents, and stationary states.
Classification : 35K55, 35B35, 35B40, 35B33, 35J60
Keywords: nonlinear parabolic equations, gradient term, finite time blowup, global existence 
@article{EJDE_2001__2001__a212,
     author = {Souplet,  Philippe},
     title = {Recent results and open problems on parabolic equations with gradient nonlinearities},
     journal = {Electronic journal of differential equations},
     year = {2001},
     volume = {2001},
     zbl = {0982.35054},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a212/}
}
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%J Electronic journal of differential equations
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Souplet,  Philippe. Recent results and open problems on parabolic equations with gradient nonlinearities. Electronic journal of differential equations, Tome 2001 (2001). http://geodesic.mathdoc.fr/item/EJDE_2001__2001__a212/