An improved upper bound on the chromatic number of the n-dimensional sphere

Source abstract

In this short note, we obtain upper bounds on the chromatic numbers of spheres using recent improvements in bounds for Euclidean space. We show that $χ(S^n_{R}) \leq (ξ_R + o(1))^n$, where $ξ_R = \frac{3\sqrt 3}{2}(1-1/(4R^2))$ and $χ(S^n_R)$ denotes the chromatic number of the $n$-dimensional sphere of a fixed radius $R$.