The ring-structure reconstruction conjecture for the prismatized sphere

Let \bbSSyn\bbS^\mathrm{Syn} be the syntomic stack and let \bbMm\ifthenelse\equal\bbS,\bbSSyn\bbM_{\mathrm{m}\ifthenelse{\equal{\bbS}{}}{}{,\bbS}}^\mathrm{Syn} be its associated monoid stack. Let (\bbSSyn)\Spf\bbZp(\bbS^\mathrm{Syn})_{\Spf \bbZ_p} and (\bbMm\ifthenelse\equal\bbS,\bbSSyn)\Spf\bbZp(\bbM_{\mathrm{m}\ifthenelse{\equal{\bbS}{}}{}{,\bbS}}^\mathrm{Syn})_{\Spf \bbZ_p} denote their pullbacks to \Spf\bbZp\Spf \bbZ_p. Ring-structure reconstruction conjecture. The map

\bbZpSyn(\bbSSyn)\Spf\bbZp\bbZ_p^\mathrm{Syn}\to(\bbS^\mathrm{Syn})_{\Spf\bbZ_p}

identifies the source with the stack of ring structures on (\bbMm\ifthenelse\equal\bbS,\bbSSyn)\Spf\bbZp(\bbM_{\mathrm{m}\ifthenelse{\equal{\bbS}{}}{}{,\bbS}}^\mathrm{Syn})_{\Spf\bbZ_p}. This is expected to follow from the main theorem cited in the source together with the non-functoriality of Raksit's height at least one deformed filtered de Rham complexes for rings.

Sources & referencesView supporting material

Primary source

Dhilan Lahoti and Deven Manam, “Cohomology theories in the moduli of ring stacks”, arXiv:2510.09582 (2025).

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