Critical sets of random smooth functions on compact manifolds II

Details Critical sets of random smooth functions on compact manifolds II Critical sets of random smooth functions on compact manifolds II

2011-01-31

arxiv.org/abs/1101.5990v2

Mathematics

Differential Geometry

42 pages, 1 figure

Scientific paper

Given a compact, $m$-dimensional Riemann manifold $(M,g)$ and a large positive constant $L$ we denote by $U_L$ the subspace of $C^\infty(M)$ spanned by the eigenfunctions of the Laplacian corresponding to eigenvalues $\leq L$. We equip $U_L$ with the standard Gaussian probability measure induced by the $L^2$-metric on $U_L$, and we denote by $N_L$ the expected number of critical points of a random function in $U_L$. We prove that $N_L\sim C_m\dim U_L$ as $L\rightarrow \infty$, where $C_m$ is an explicit positive constant that depends only on the dimension $m$ and satisfying the asymptotic estimate $\log C_m\sim\frac{m}{2}\log m$ as $m\ra \infty$.

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