Geodesic
The universal deformation of the Witt ring scheme
Sbornik. Mathematics, Tome 208 (2017) no. 6, pp. 764-790 Cet article a éte moissonné depuis la source Math-Net.Ru

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We determine the universal deformation over reduced base rings of the Witt ring scheme enhanced by a Frobenius lift and Verschiebung. It agrees with a $q$-deformation introduced earlier by the second author; we also give a simpler description for this. In the appendix we discuss a Witt vector theory for ind-rings which may be of independent interest. Bibliography: 7 titles.
Keywords: Witt ring
Mots-clés : $q$-deformation. 
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     title = {The universal deformation of the {Witt} ring scheme},
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Christopher Deninger; Young-Tak Oh. The universal deformation of the Witt ring scheme. Sbornik. Mathematics, Tome 208 (2017) no. 6, pp. 764-790. http://geodesic.mathdoc.fr/item/SM_2017_208_6_a2/

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