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Modules over rings of differential operators.

30 votes
8 answers
4k views

Applications of microlocal analysis?

What examples are there of striking applications of the ideas of microlocal analysis? Ideally I'm looking for specific results in any of the relevant fields (PDE, algebraic/differential geometry/topol …
25 votes
0 answers
749 views

What is a Green's function in the language of $\mathcal{D}$-modules?

Let $P$ be an analytic linear differential operator defined on some open interval $X=(a,b)$ and $\mathcal{M}=\mathcal{D}_X / \mathcal{D}_X \bullet P$ the corresponding $\mathcal{D}$-module. I'm trying …
9 votes
0 answers
260 views

About an algebraic construction of a sheaf of formal microdifferential operators

While reading these notes by Victor Ginzburg on $D$-modules I found a certain construction of Microlocailzation in the algebraic setting which unfortunately doesn't seem to be elaborated on a lot in t …
1 vote

What is integration along the fibers in D-module theory?

(All functors and categories are derived, all $\mathcal{D}$-modules are holonomic and $f: X \to Y$ is proper for simplicity). We may use the adjunction $\int_f \dashv f^!$ to get some interpretation …
Saal Hardali's user avatar
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6 votes
0 answers
221 views

Prime spectrum of the derived category of holonomic $\mathcal{D}$-modules?

Let $X$ be a smooth algebraic (/projective if it simplifies things considerably) variety over $\mathbb{C}$ and consider the derived category $\mathcal{C}=D_h^b(\mathcal{D}_X)$ of bounded complexes of …
3 votes
1 answer
347 views

Who are the compact generators in the derived category of $\mathcal{D}_X$-modules?

Let $X$ be a smooth affine variety over $\mathbb{C}$ and let $\mathcal{D}_X$ be its algebra of differential operators. Consider $\mathcal{C}=\mathcal{D}_X$-$\text{mod}$, the stable $\infty$ category …
5 votes
0 answers
264 views

Do almost commutative flat degenerations induce equality in K-theory? (Or: Is the characteri...

I intentionally phrased the title to match a different question which is almost identical to the one i'm asking. However similar, the answer there, which uses commutative algebraic geometry, is not di …
15 votes
4 answers
3k views

Why should the tensor product of $\mathcal{D}_X$-modules over $\mathcal{O}_X$ be a $\mathcal...

Let $R$ be a regular algebra over a field $k$ of char 0. Let $D$ be its corresponding algebra of differential operators. As in the general setting of non-commutative algebra we can tensor right $D$- …
-1 votes
1 answer
298 views

Is $\mathbb{P}^1$ the only smooth projective curve with a locally split tangent lie algebroid?

Let $C$ be a smooth projective curve over an algebraically closed field $k$. The tangent lie algeborid $\mathcal{T}_C$ of $C$ is just sheaf of vector fields on $C$ equipped with the usual lie bracke …
2 votes
0 answers
113 views

A global geometric formulation of the fundamental theorem of Picard Vessiot theory?

Let $X$ be a smooth curve over an algebraically closed field of characteristic 0. The category of quasi-coherent $D$-modules $\mathcal{D}_X$-$Mod$ is a symmetric monoidal abelian category. We can ther …
12 votes
1 answer
826 views

What kind of algebraic object is $\mathcal{D}_X$? (algebra of diifferential operators). What...

Let $R$ be a regular ring over a field of char 0. Let $X=Spec R$ and $D=\mathcal{D}_X$ the algebra of differential operators over it. The overall vague question is what kind of algebraic object is $ …
10 votes
0 answers
262 views

Is there a classification of differential equations over the field of fractions of formal po...

Let $k$ be an algebraically closed field of characteristic 0. Consider the field of fractions of formal power series $K:= Frac(k[[T_1,...,T_n]])$. We have the corresponding algebra of differential ope …
17 votes
1 answer
1k views

D-modules over algebraic curves VS differential Galois theory

Disclaimer: I know very little about both of the fields in question. My question is pretty simple: What's the relation between differential Galois theory and D-modules over algebraic curves? …