Strong spectral gap for geometrically finite hyperbolic manifolds

Abstract

Let $\Gamma <G:=\mathrm{SO}(d+1,1)$ for $d\ge 1$ be a Zariski dense, geometrically finite, discrete subgroup with critical exponent strictly greater than $d/2$. We show that $L^2(\Gamma \backslash G)$ admits a strong spectral gap, confirming a conjecture of Mohammadi and Oh. This extends the spherical spectral gap on $L^2(\Gamma \backslash {\mathbb{H}}^{d+1})\cong L^2(\Gamma \backslash G/\mathrm{SO}(d+1))$, which follows by the works of Lax-Phillips, Patterson, and Sullivan by different methods. As a consequence, we establish rates of decay of matrix coefficients, and of exponential mixing of the frame flow, that are explicitly determined by the size of the strong spectral gap.

28 pages