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Classically, mixed versions were only constructed in very special cases due to non-semisimplicity of Frobenius. Our construction sidesteps this issue by semi-simplifying the Frobenius action itself. However, the category $\Shv_{\gr, \compct}(\mathcal{Y})$ agrees with those previously constructed when they are available. For example, for any reductive group $G$ with a fixed pair $T\subset B$ of a maximal torus and a Borel subgroup, we have an equivalence of monoidal $\DG$ weight categories $\Shv_{\gr, \compct}(B\backslash G/B) \simeq \Ch^{\bounded}(\SBim_W)$, where $\Ch^{\bounded}(\SBim_W)$ is the monoidal $\DG$-category of bounded chain complexes of Soergel bimodules and $W$ is the Weyl group of $G$.
More generally, for any pair of stacks $\mathcal{Y}\to \mathcal{Z}$ satisfying some mild conditions and any map between topological spaces $N\to M$, we define $(\mathcal{Y}, \mathcal{Z})^{N, M} = \mathcal{Y}^N \times_{\mathcal{Z}^N} \mathcal{Z}^M$ to be the space of maps from $M$ to $\mathcal{Z}$ along with a lift to $\mathcal{Y}$ of its restriction to $N$. Using the pair of pants construction, we define an $\En_n$-category $\Hecke_n(\mathcal{Y}, \mathcal{Z}) = \IndCoh_0\left(\left((\mathcal{Y}, \mathcal{Z})^{\Sphere^{n-1}, \Dsk^n}\right)^\wedge_{\mathcal{Y}}\right)$ and compute its factorization homology on any $d$-dimensional manifold $M$ with $d\leq n$, \[ \int_M \Hecke_n(\mathcal{Y}, \mathcal{Z}) \simeq \IndCoh_0\left(\left((\mathcal{Y}, \mathcal{Z})^{\partial (M\times \Dsk^{n-d}), M}\right)^\wedge_{\mathcal{Y}^M}\right), \] where $\IndCoh_0$ is the sheaf theory introduced by Arinkin–Gaitsgory and Beraldo. Our result naturally extends previous known computations of Ben-Zvi–Francis–Nadler and Beraldo.
These notes can be somewhat sketchy (i.e. use at your own risk). If you have any comments (mathematical or otherwise), please let me know.
Factorization algebras and categegories
for the conference in local geometric Langlands (Paris, Jan. 2018)Quot schemes
for the Topic Examination at UChicagoSmooth base change theorem
for the etale cohomology student seminar at UChicagoTrigonometric sums
for the etale cohomology student seminar at UChicago