We approximate intersection numbers $\big\langle \psi_1^{ d_1}\cdots \psi_n^{ d_n}\big\rangle_{ g,n}$ on Deligne-Mumford's moduli space $\overline{ \mathcal M}_{ g,n}$ of genus $g$ stable complex curves with $n$ marked points by certain closed-form expressions in $d_1,\dots,d_n$. Conjecturally, these approximations become asymptotically exact uniformly in $d_i$ when $g\to\infty$ and $n$ remains bounded or grows slowly. In this note we prove a lower bound for the intersection numbers in terms of the above-mentioned approximatingexpressions multiplied by an explicit factor $\lambda(g,n)$, which tends to $1$ when $g\to\infty$ and $d_1+\dots+d_{ n-2}=o(g)$.
Categories: math.GT