# The blow-up rate for a non-scaling invariant semilinear wave equations

## TL;DR

This paper establishes an upper bound for blow-up solutions of a non-scale-invariant semilinear wave equation with a logarithmic perturbation, and precisely characterizes the blow-up rate in one dimension.

## Contribution

It provides the first blow-up rate characterization for a non-scaling invariant semilinear wave equation with a logarithmic term.

## Key findings

- Upper bound for blow-up solutions established
- Exact blow-up rate identified in one dimension
- Logarithmic perturbation complicates analysis but is resolved

## Abstract

We consider the semilinear wave equation $$\partial_t^2 u -\Delta u =f(u), \quad (x,t)\in \mathbb{R}^N\times [0,T),\qquad (1)$$ with $f(u)=|u|^{p-1}u\log^a (2+u^2)$, where $p>1$ and $a\in \mathbb{R}$. We show an upper bound for any blow-up solution of (1). Then, in the one space dimensional case, using this estimate and the logarithmic property, we prove that the exact blow-up rate of any singular solution of (1) is given by the ODE solution associated with $(1)$, namely $u'' =|u|^{p-1}u\log^a (2+u^2)$ Unlike the pure power case ($g(u)=|u|^{p-1}u$) the difficulties here are due to the fact that equation (1) is not scale invariant.