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We consider a rough differential equation with a non-linear damping driftterm: \begin{align*} dY(t) = - |Y|^{m-1} Y(t) dt + \sigma(Y(t)) dX(t),\end{align*} where $X$ is a branched rough path of arbitrary regularity $\alpha>0$, $m>1$ and where $\sigma$ is smooth and satisfies an $m$ and$\alpha$-dependent growth property. We show a strong a priori bound for $Y$,which includes the "coming down from infinity" property, i.e. the bound on$Y(t)$ for a fixed $t>0$ holds uniformly over all choices of initial datum$Y(0)$. The method of proof builds on recent work by Chandra, Moinat and Weberon a priori bounds for the $\phi^4$ SPDE in arbitrary subcritical dimension. Akey new ingredient is an extension of the algebraic framework which permits toderive an estimate on higher order conditions of a coherent controlled roughpath in terms of the regularity condition at lowest level.

A priori bounds for rough differential equations with a non-linear damping term