  Based on the ultraviolet asymptotic freedom of nonlocal quantum gravity, we
show that the trans-Planckian energy regime is unattainable in laboratory
experiments. As physical implications, it turns out that the violation of
causality, typical of nonlocal field theories, can never be detected in
particle accelerators, while the asymptotic freedom of the theory provides an
elegant solution to the so called trans-Planckian cosmological problem.
