Special Year 2014-15: The Topology of Algebraic Varieties

Topology of Algebraic Varieties

December 03, 2014 | 11:15am - 12:15pm

Let $A$ be an affine variety inside a complex $N$ dimensional vector space which either has an isolated singularity at the origin or is smooth at the origin. The intersection of $A$ with a very small sphere turns out to be a contact manifold called...

Topology of Algebraic Varieties

December 02, 2014 | 11:00am - 12:30pm

In this talk, we will discuss the local geometry of the closure of orbit space that parametrising smooth Fano manifolds inside certain Chow/Hilbert scheme. In particular, we will discuss the separatedness of the moduli of smoothable $K$-polystable $...

Topology of Algebraic Varieties

November 19, 2014 | 11:15am - 12:15pm

In 1984 Hirzebruch constructed the first examples of smooth toroidal compactifications of ball quotients with non-nef canonical divisor. In this talk, I will show that if the dimension is greater or equal than three then such examples cannot exist...

Topology of Algebraic Varieties

November 18, 2014 | 2:00pm - 3:00pm

Let \(Y\) be a smooth rational surface and let \(D\) be an effective divisor linearly equivalent to \(-K_Y\), such that \(D\) is a cycle of smooth rational curves. Such pairs \((Y,D)\) arise in many contexts, for example in the study of...

Topology of Algebraic Varieties

November 12, 2014 | 11:15am - 12:15pm

We discuss the universal triviality of the \(\mathrm{CH}_0\)-group of cubic hypersurfaces, or equivalently the existence of a Chow-theoretic decomposition of their diagonal. The motivation is the study of stable irrationality for these varieties...

Topology of Algebraic Varieties

November 11, 2014 | 3:30pm - 4:30pm

Tate's conjecture for divisors on algebraic varieties can be rephrased as a finiteness statement for certain families of polarized varieties with unbounded degrees. In the case of abelian varieties, the geometric part of these finiteness statements...