Vladimir Drinfeld

activity

20242026

collaborators

3 papers

math.AG2026

Ring stacks conjecturally related to the stacks $B T_{n}^{G, I^¼}$

Vladimir Drinfeld

Using the ring space of sheared Witt vectors, we define certain ring stacks. We suggest several models for the ring stacks. Motivation: there is a conjectural description of the st…

math.CT2025

On the quotient of a groupoid by an action of a 2-group

Vladimir Drinfeld

If X is a groupoid equipped with an action of a 2-group G then one has a 2-groupoid X/G. We describe the fibers of the functor from X/G to the 1-groupoid $I ¨ _{0} (X) / I ¨ _{0} (G)$ . We also…

math.AG2024

Toward Shimurian analogs of Barsotti-Tate groups

Vladimir Drinfeld

We first recall Grothendieck's notion of n-truncated Barsotti-Tate group. Such groups form an algebraic stack over the integers. The problem is to give an illuminating description…

Ring stacks conjecturally related to the stacks BTnG,I^¼​

On the quotient of a groupoid by an action of a 2-group

Toward Shimurian analogs of Barsotti-Tate groups

Ring stacks conjecturally related to the stacks $B T_{n}^{G, I^¼}$