Let $X$ be a projective, equidimensional, singular scheme over an algebraically closed field. Then the existence of a geometric smoothing (i.e. a family of deformations of $X$ over a smooth base curve whose generic fibre is smooth) implies the existence of a formal smoothing as defined by Tziolas. In this paper we address the reverse question giving sufficient conditions on $X$ that guarantee the converse, i.e. formal smoothability implies geometric smoothability. This is useful in light of Tziolas' results giving criteria for the existence of formal smoothings. We also present a criterion to determine whether a formal deformation of a local complete intersection scheme is a formal smoothing by considering only a finite number of infinitesimal thickenings.
On formal schemes and smoothings
Nobile, Alessandro
2022
Abstract
Let $X$ be a projective, equidimensional, singular scheme over an algebraically closed field. Then the existence of a geometric smoothing (i.e. a family of deformations of $X$ over a smooth base curve whose generic fibre is smooth) implies the existence of a formal smoothing as defined by Tziolas. In this paper we address the reverse question giving sufficient conditions on $X$ that guarantee the converse, i.e. formal smoothability implies geometric smoothability. This is useful in light of Tziolas' results giving criteria for the existence of formal smoothings. We also present a criterion to determine whether a formal deformation of a local complete intersection scheme is a formal smoothing by considering only a finite number of infinitesimal thickenings.File | Dimensione | Formato | |
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https://hdl.handle.net/20.500.14242/166484
URN:NBN:IT:SISSA-166484