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The Shimurian BT stack is a gerbe over truncated displays

· 2025 · math.AG · arXiv 2510.23207

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abstract

We show that the mod $p$ fiber of the Shimurian stack $BT_n^{G,\mu}$ constructed by Gardner--Madapusi is a gerbe over the corresponding stack of truncated displays. This confirms a conjecture of Drinfeld.

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math.AG 1

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2026 1

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UNVERDICTED 1

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Sheared Witt Vectors

math.AG · 2026-07-01 · unverdicted · novelty 0.0

Exposition of the sheared Witt vectors on rings with perfect F_p-algebra reduction.

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  • Sheared Witt Vectors math.AG · 2026-07-01 · unverdicted · none · ref 25 · internal anchor

    Exposition of the sheared Witt vectors on rings with perfect F_p-algebra reduction.