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

3 votes
0 answers
115 views

Why should there always exist a smooth anticanonical section of an index 1 Fano?

I've been going through a bit of the literature on the classification of Fano varieties, and it was pointed out to me by one of my committee members that I overlooked an important question regarding t …
cdsb's user avatar
  • 317
3 votes
2 answers
239 views

Rational divisors on Calabi–Yau threefolds

Following the construction of [2], consider the full subcategory $\mathcal{D}_0 \subset D^\flat(\operatorname{Coh} \omega_{\mathbb{P}^1})$ consisting of complexes whose cohomology objects are supporte …
cdsb's user avatar
  • 317
2 votes
1 answer
122 views

Right adjoint of subcollection of semi-orthogonal decomposition

Suppose $X$ is a prime Fano threefold of index 1 such that $H = -K_X$ is ample. There is a full classification of the derived category of such threefolds depending on the genus of $X$; in the case tha …
cdsb's user avatar
  • 317
3 votes
1 answer
390 views

Should we expect Kuznetsov component to be independent of exceptional collection

As explained in the comments of this answer, given a smooth Fano 3-fold of index 1 and genus $g \geq 6$, we have two semiorthogonal decompositions $$\langle \text{Ku}(X), \mathcal{E}, \mathcal{O}_X\ra …
cdsb's user avatar
  • 317
1 vote
0 answers
102 views

Computing Grothendieck group of (unnodal) Enriques surface

Let $X$ be an unnodal Enriques surface together with an isotropic 10-sequence $\{ f_1, \dots, f_{10}\} \subset \operatorname{Num}(X)$, and let $F_i^\pm \in \operatorname{NS}(X)$ denote the two preimag …
cdsb's user avatar
  • 317
3 votes
1 answer
167 views

Pushforward of exceptional vector bundle is spherical for local P^2

I've been reading through a bit of the literature on stability conditions, and one of the models that has come up is the 'local projective plane'. Explicitly, this is the total space of the canonical …
cdsb's user avatar
  • 317
3 votes
1 answer
170 views

Left adjoint for nested admissible categories

This question is motivated by the construction of the Kuznetsov component on a prime Fano threefold $X$ of index 1 (say genus $g \geq 6$, $g \neq 7, 9$): $$ D^b(X) = \langle Ku(X), E, \mathcal{O}_X \r …
cdsb's user avatar
  • 317
0 votes
0 answers
167 views

Cone of morphism induced by Serre duality

For a smooth projective variety $X$, Serre duality gives an exact autoequivalence on the derived category : $$ S_X : D^\flat(X) \to D^\flat(X), \hspace{3em} S_X(-) = - \otimes \omega_X[\dim X] $$ sati …
cdsb's user avatar
  • 317
1 vote
0 answers
56 views

Geometric stability conditions on calabi-yau's fibred over Fano always identical to geometri...

I apologize in advance for the long title. This question is motivated primarily by [2], with the explicit example of $\mathbb{P}^2$ and $\omega_{\mathbb{P}^2}$ computed in [3] and [1], respectively. L …
cdsb's user avatar
  • 317