Models of Torsors Over Affine Spaces

Abstract

Let X := A n R be the n-dimensional affine space over a discrete valuation ring R with fraction field K. We prove that any pointed torsor Y over A n K under the action of an affine finite type group scheme can be extended to a torsor over A n R possibly after pulling Y back over an automorphism of A n K . The proof is effective. Other cases, including X = α p,R , will also be discussed.Mathematics Subject Classification. Primary: 14L30, 14L15. Secondary: 11G99.