Geometry of the Cassinian metric and its inner metric
  The Cassinian metric and its inner metric have been studied for subdomains of the $n$-dimensional Euclidean space $\mathbb{R}^n$ ($n\ge 2$) by the first named author. In this paper we obtain various inequalities between the Cassinian metric and other related metrics in some specific subdomains of $\mathbb{R}^n$. Also, a sharp distortion property of the Cassinian metric under M\"obius transformations of the unit ball is obtained. 
Zair Ibragimov, Manas Ranjan Mohapatra, Swadesh Kumar Sahoo, and   Xiaohui Zhang
math.MG