  Despite the no-go theorem [5] which rules out static stable solitons in
Galileon theory, we propose a family of solitons that evade the theorem by
traveling at the speed of light. These domain-wall-like solitons are stable
under small fluctuations-analysis of perturbation shows neither ghost-like nor
tachyon-like instabilities, and perturbative collision of these solitons
suggests that they pass through each other asymptotically, which maybe an
indication of the integrability of the theory itself.
