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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.
37
votes
Accepted
Clausen–Scholze's Theorem 9.1 of Analytic.pdf, in view of light condensed sets, AKA is the L...
Good question!
We've been trying to figure this out as we went along, but so far unsuccessfully. Some more precise points:
For many (but definitely not all) applications to geometry over the real num …
18
votes
Accepted
Is there a ring stacky approach to $\ell$-adic or rigid cohomology?
This is an interesting question.
First, I think the [PS] reference does not give the "correct" Betti stack. In my notes on 6 functors, I define a different stack $X_B$ such that $D_{\mathrm{qc}}(X_B)$ …
13
votes
Can we use Mann's six-functor formalism with D-modules?
I have finally found some time to write up the $6$-functor formalisms in coherent cohomology (a la Gaitsgory--Rozenblyum) and for $D$-modules, see Lecture 8 and its appendix.
A short synopsis is that …
30
votes
Accepted
When (or why) is a six-functor formalism enough?
When defining a homotopy-coherent structure, you have to strike the correct balance between supplying enough data (so that all isomorphisms (between isomorphisms, ...) that you need later are actually …
5
votes
Verdier duality under more general conditions
Let me add there is now a reference for the claims in Dan Peterson's answer, namely Marco Volpe has worked out the Topological $6$-functor formalism.
I also gave some (brief) account of this in Lectur …
67
votes
Consequences of Kirti Joshi's new preprint about p-adic Teichmüller theory on the validity o...
I should point out that Joshi's paper does not falsify Remark 9 of our note.
In Joshi's Theorem 4.8 (which he claims to falsify our Remark 9) the curve $X/E$ stays the same (and hence of course its te …
10
votes
Accepted
How does the cohomology of the Lubin-Tate/Drinfeld tower fit into categorical p-adic local L...
Briefly (I will elaborate below): One expects that their fully faithful functor from (roughly) $p$-adic representations of $G(\mathbb Q_p)$ to (roughly) coherent sheaves on the Emerton--Gee stack exte …
12
votes
Mixing solids and liquids
Good question!
I think the real context for the question was whether certain objects that are implicit in work of Darmon (and collaborators) could exist within this framework of analytic geometry. The …
9
votes
Some questions from the paper by Scholze-Weinstein
In Lemma 4.1.7, we actually assume that $R$ is f-semiperfect (i.e. a quotient of a perfect ring by a finitely generated ideal); I doubt the result is true without this assumption.
Note that $W_{PD}$ i …
4
votes
Accepted
Compactly supported sections of coherent sheaves and the dualizing complex
Isn't the dualizing complex defined in general in the proper case by taking applying the right adjoint of $\pi_\ast$ to $k$? That's what I'll take as the definition anyways. The Gorenstein property ju …
31
votes
Accepted
Examples of solid abelian groups
Here's a rule of thumb: As long as the construction is nonarchimedean and does not involve noncompleted tensor products, it's solid.
More precisely, anything you can build from discrete abelian groups …
4
votes
Accepted
Flatness of maps of analytic rings
Flatness in analytic geometry is an interesting question! As Dustin says, it comes with several important caveats.
First, open immersions may not be flat even in the weakest sense of the word. Here is …
11
votes
Perfectoid approach to resolution of singularities in char $p$
Somehow that question slipped my radar, sorry!
The truth is that shamefully I'm not able to say much, as I don't have a strong knowledge of resolution of singularities. But at least so far, the flow o …
20
votes
Accepted
What is the upper shriek in Grothendieck duality in the non-proper case?
Classically, the functor $f^!$ is indeed not a right adjoint in general. Clausen and I have recently found a way to make it a right adjoint in general, by enlarging the category of modules to that of …
8
votes
Vector bundles on adic spaces
The question is local on $X$, so we may assume that $\mathcal E$ is finite free, of rank $n$, say. In that case, as also SashaP points out, the question amounts to the question whether $\mathbb A^n_X$ …