Global nonexistence and blow-up results for a quasi-linear evolution equation with variable-exponent nonlinearities

Abita Rahmoune, Benyattou Benabderrahmane

Abstract


This research considers a class of quasi-linear parabolic equation with
variable exponents:%
\begin{equation*}
a\left( x,t\right) u_{t}-\Delta _{m\left( .\right) }u=f\left( u\right)
\end{equation*}%
in which $a(x,t)>0$ is a nonnegative function and the exponents of
nonlinearity $m(x)$, $p(x)$ are given measurable functions. Under suitable
conditions on the given data a finite-time blow-up result of solutions is
proven if the initial datum possesses suitable positive energy and in this
case we precise estimate for the lifespan $T^{\ast }$ of the solution.
Blow-up of solutions with negative initial energy is also established.


Keywords


Global nonexistence; quasi-linear evolution equation; Sobolev spaces with variable exponents; variable nonlinearity

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DOI: http://dx.doi.org/10.24193/subbmath.2021.3.11

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