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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 …
Peter Scholze's user avatar
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 $D_{\mathrm{qc}}(X_B)$ …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 …
Peter Scholze's user avatar
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 $\mathbb A^n_X$ …
Peter Scholze's user avatar

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