Pinned geometric configurations in Euclidean space and Riemannian manifolds

Abstract: Let $M$ be a compact $d$-dimensional Riemannian manifold without a boundary. Given $E \subset M$, let $\Delta_{\rho}(E)={\rho(x,y): x,y \in E }$, where $\rho$ is the Riemannian metric on $M$. Let $\Delta_{\rho}^x$ denote the pinned distance set, namely, ${\rho(x,y): y \in E }$ with $x \in E$. We prove that if the Hausdorff dimension of $E$ is greater than $\frac{d+1}{2}$, then there exist many $x \in E$ such that the Lebesgue measure of $\Delta^x_{\rho}(E)$ is positive. This result was previously established by Peres and Schlag in the Euclidean setting. The main result is deduced from a variable coefficient Euclidean formulation, which can be used to study a variety of geometric problems. We extend our result to the setting of chains studied in \cite{BIT15} and obtain a pinned estimate in this context. Moreover, we point out that our scheme is quite universal in nature and this idea will be exploited in variety of settings in the sequel.