## Differential and Integral Equations

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

#### Abstract

The critical constant $\mu$ (see (1.1)) 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.

#### Article information

Source
Differential Integral Equations, Volume 32, Number 11/12 (2019), 659-678.

Dates
First available in Project Euclid: 22 October 2019