# Soliton dynamics for the 1D NLKG equation with symmetry and in the absence of internal modes

## TL;DR

This paper studies the stability and asymptotic behavior of even solutions near the soliton for the 1D nonlinear Klein-Gordon equation with certain nonlinearities, using virial estimates due to the absence of internal modes.

## Contribution

It establishes asymptotic stability for solutions near the soliton in the absence of internal modes and resonance, employing virial estimates instead of dispersive tools.

## Key findings

- Stability in energy space implies asymptotic stability in local energy norm.
- Existence of a Lipschitz graph of initial data leading to stable trajectories.
- Applicable for nonlinearities with lpha > 1, where no internal modes are present.

## Abstract

We consider the dynamics of even solutions of the one-dimensional nonlinear Klein-Gordon equation $\partial_t^2 \phi - \partial_x^2 \phi + \phi - |\phi|^{2\alpha} \phi =0$ for $\alpha>1$, in the vicinity of the unstable soliton $Q$. Our main result is that stability in the energy space $H^1(\mathbb R)\times L^2(\mathbb R)$ implies asymptotic stability in a local energy norm. In particular, there exists a Lipschitz graph of initial data leading to stable and asymptotically stable trajectories. The condition $\alpha>1$ corresponds to cases where the linearized operator around $Q$ has no resonance and no internal mode. Recall that the case $\alpha>2$ is treated in Krieger-Nakanishi-Schlag using Strichartz and other local dispersive estimates. Since these tools are not available for low power nonlinearities, our approach is based on virial type estimates and the particular structure of the linearized operator observed in Chang-Gustafson-Nakanishi-Tsai.