The lifespan of solutions of semilinear wave equations with the scale-invariant damping in one space dimension

Abstract

The critical constant of time-decaying damping in the scale-invariant case is recently conjectured. It also has been expected that the lifespan estimate is the same as for the associated semilinear heat equations if the constant is in the \heat-like" domain. In this paper, we point out that this is not true if the total integral of the sum of initial position and speed vanishes. In such a case, we have a new type of the lifespan estimates which is closely related to the non-damped case in shifted space dimensions.

arXiv comment20 pages. The title is slightly changed. English is modified and References are updated

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• The lifespan of classical solutions of semilinear wave equations with spatial weights and compactly supported data in one space dimension
• Critical exponent for the wave equation with a time-dependent scale invariant damping and a cubic convolution