The augmentation-category derived adjunction conjecture

Let A\mathbb{A} be an augmentation category, and let Gnsm(dAff)\mathcal{G}_n^\mathrm{sm}(\textbf{dAff}) and A-Gnsm(dAff)\mathbb{A}\text{-}\mathcal{G}_n^\mathrm{sm}(\textbf{dAff}) denote the homotopy categories of the corresponding derived Artin (A,n)(\mathbb{A},n)-geometric stacks; likewise, let Gneˊt(dAff)\mathcal{G}_n^\mathrm{'ét}(\textbf{dAff}) and A-Gneˊt(dAff)\mathbb{A}\text{-}\mathcal{G}_n^\mathrm{'ét}(\textbf{dAff}) denote the derived Deligne–Mumford versions. Augmentation-category derived adjunction conjecture. There is an adjunction

Li! ⁣:Gnsm(dAff)A-Gnsm(dAff):Ri\mathbb{L}i_!\colon\mathcal{G}_n^\mathrm{sm}(\textbf{dAff})\rightleftarrows\mathbb{A}\text{-}\mathcal{G}_n^\mathrm{sm}(\textbf{dAff}):\mathbb{R}i^*

(and, respectively, an adjunction)

Li! ⁣:Gneˊt(dAff)A-Gneˊt(dAff):Ri.\mathbb{L}i_!\colon\mathcal{G}_n^\mathrm{'ét}(\textbf{dAff})\rightleftarrows\mathbb{A}\text{-}\mathcal{G}_n^\mathrm{'ét}(\textbf{dAff}):\mathbb{R}i^*.

The proposed adjunction would relate ordinary and augmented derived geometric stacks. The source explains that relative categories do not have Quillen equivalences, so proving this requires constructing full Quillen model structures and a Quillen adjunction; it may fail for some augmentation categories.

Sources & referencesView supporting material

Primary source

Scott Balchin, “Augmented Homotopical Algebraic Geometry”, arXiv:1711.02640 (2017).

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