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 ${\Delta }_{\rho }^x(E)$ 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.