On compactifications of affine homology 3-cells into quadric fibrations

Abstract

In this paper we deal with compactifications of affine homology $3$-cells into quadric fibrations such that the boundary divisors contain fibers. We show that all such affine homology $3$-cells are isomorphic to the affine $3$-space $\mathbb{A}^{3}$. Moreover, we show that all such compactifications can be connected by explicit elementary links preserving $\mathbb{A}^{3}$ to the projective $3$-space $\mathbb{P}^{3}$.