Blow-Up Results for a Nonlinear Hyperbolic Equation with Lewis Function
© Faramarz Tahamtani 2009
Received: 17 February 2009
Accepted: 28 September 2009
Published: 11 October 2009
The initial boundary value problem for a nonlinear hyperbolic equation with Lewis function in a bounded domain is considered. In this work, the main result is that the solution blows up in finite time if the initial data possesses suitable positive energy. Moreover, the estimates of the lifespan of solutions are also given.
Let be a bounded domain in with smooth boundary . We consider the initial boundary value problem for a nonlinear hyperbolic equation with Lewis function which depends on spacial variable:
where , , , and is a continuous function.
In the early 1970s, Levine  considered the nonlinear wave equation of the form
in a Hilbert space where are are positive linear operators defined on some dense subspace of the Hilbert space and is a gradient operator. He introduced the concavity method and showed that solutions with negative initial energy blow up in finite time. This method was later improved by Kalantarov and Ladyzheskaya  to accommodate more general cases.
Very recently, Zhou  considered the initial boundary value problem for a quasilinear parabolic equation with a generalized Lewis function which depends on both spacial variable and time. He obtained the blowup of solutions with positive initial energy. In the case with zero initial energy Zhou  obtained a blow-up result for a nonlinear wave equation in . A global nonexistence result for a semilinear Petrovsky equation was given in .
In this work, we consider blow-up results in finite time for solutions of problem (1.1)-(1.3) if the initial datas possesses suitable positive energy and obtain a precise estimate for the lifespan of solutions. The proof of our technique is similar to the one in . Moreover, we also show the blowup of solution in finite time with nonpositive initial energy.
Throughout this paper denotes the usual norm of .
The source term in (1.1) with the primitive
Let be the best constant of Sobolev embedding inequality
from to .
We need the following lemma in [4, Lemma 2.1].
2. Blow-Up Results
The corresponding energy to the problem (1.1)-(1.3) is given by
and one can find that easily from
We note that from (1.6) and (1.7), we have
and by Sobolev inequality (1.8), , , where
Note that has the maximum value at which are given in (2.1).
Adapting the idea of Zhou , we have the following lemma.
for all .
which completes the proof.
Then the corresponding solution to (1.1)–(1.3) blows up in finite time.
This completes the proof.
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