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Algebraic varieties, stacks, sheaves, schemes, moduli spaces, complex geometry, quantum cohomology.

3 votes
Accepted

Semi-stability of $S^n\Omega_S$ with respect to $K_S$

Ciao Francesco! The answer to your question is yes, and the work of Bogomolov you are looking for about semistability of the tangent space (for minimal surfaces of general type indeed, no need of ampl …
diverietti's user avatar
  • 7,902
7 votes

Hom between Brody hyperbolic varieties

I assume that for $\operatorname{Hom}(X,Y)$ you mean $\operatorname{Hol}(X,Y)$, that is the family of all holomorphic maps from $X$ to $Y$, endowed with its universal complex structure (which exists s …
diverietti's user avatar
  • 7,902
27 votes
Accepted

Is the complex structure of $\mathbb CP^n$ unique?

Let me write this too long comment as an answer. As abx says, what we do know is Theorem 1. If a Kähler manifold $X$ is homeomorphic to $\mathbb{CP}^n$, then $X$ is biholomorphic to it. This is due to …
diverietti's user avatar
  • 7,902
5 votes
Accepted

A big line bundle in complex compact manifold

At least in the projective setting the following holds true (this is taken from J. Kollár "Shafarevich maps and automorphic forms", Proposition 13.14.2). Proposition. Let $X$ be a smooth projective va …
diverietti's user avatar
  • 7,902
6 votes
1 answer
279 views

Bounded non-symmetric domains covering a compact manifold

This question is somewhat related to this other question of mine. I was wondering which are the known examples of bounded domains $\Omega$ in $\mathbb C^n$ admitting a compact free quotient. By a theo …
11 votes
0 answers
200 views

Holomorphically convex manifolds and Bergman complete manifolds

Suppose $X$ is a complex manifold which admits the Bergman metric (for definitions, see for instance Kobayashi's book "Hyperbolic Complex Spaces"). Suppose moreover that the Bergman metric of $X$ is c …
7 votes

Griffiths-positive metric

As soon as the base manifold has dimension greater than one, the existence of Griffiths positive metrics on an ample vector bundle is not known (and even in the one dimensional case, it is not obvious …
Ben McKay's user avatar
  • 26.3k
12 votes
Accepted

Homotopy type of a complex affine variety

If $X$ is smooth, and if you ask to have the same homotopy type of a CW complex of real dimension at most $n$, this is precisely the statement of the Andreotti-Frankel theorem. It is true, more gener …
diverietti's user avatar
  • 7,902
9 votes

Direct sum of two stable bundles of same slope

One possible answer could be: by opening any book on vector bundles, and looking at the proposition right after the definition of stable vector bundle. :) Another possible answer is as follows. What …
diverietti's user avatar
  • 7,902
3 votes

Uniruled degenerations of abelian varieties

Maybe this can be of some help. In this paper by K. Oguiso, you can find at the end an appendix by N. Nakayama. In this appendix he gives a theorem which describes the local structure of a degenerati …
diverietti's user avatar
  • 7,902
0 votes

A question about nef classes on compact Kähler manifolds

Just for fun, here is an answer in the purely algebraic setting. So, suppose that $X$ is irreducible projective algebraic of dimension $n$, $\alpha=c_1(\mathcal O_X(D))$ is the class of a nef diviso …
diverietti's user avatar
  • 7,902
6 votes

References for the minimal model program

Of course it depends mostly on your background. But the first chapter, as well as the first half of the second chapter of Kollár-Mori's "Birational Geometry of Algebraic Varieties" is an incredibly in …
diverietti's user avatar
  • 7,902
5 votes

Is hyperbolicity a Zariski open condition?

Kobayashi hyperbolicity (or Brody hyperbolicity, the two notions coincide for compact complex spaces), is an open condition with respect to the analytic topology. Thus, for instance, once you find an …
diverietti's user avatar
  • 7,902
7 votes

Non-cohomological proof that the pullback of an ample bundle by a finite morphism is ample

Here is a differential geometric point of view, which is thus a proof over the complex numbers (but verbatim as I write it it works only for étale morphisms as Donu Arapura points out in the comments …
diverietti's user avatar
  • 7,902
2 votes
Accepted

Complex manifolds with trivial canonical bundle

I think the answers you are looking for are in this paper by V. Tosatti, see in particular Proposition 1.1, point (4) and Proposition 1.3. Warning (in view of the comment below by S.S.): the holonom …
diverietti's user avatar
  • 7,902

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