For a compact subset K of a closed symplectic manifold,
Entov-Polterovich introduced the notion of (super)heaviness, which
reveals surprising symplectic rigidity. When K
is a Lagrangian submanifold, there is a well-established
criterion for its...
The Mackey-Zimmer representation theorem is a key structural
result from ergodic theory: Every compact extension between ergodic
measure-preserving systems can be written as a skew-product by a
homogeneous space of a compact group. This is used, e.g...
Let X be a smooth projective variety over the field of complex
numbers. The classical Riemann-Hilbert correspondence supplies a
fully faithful embedding from the category of perverse sheaves on X
to the category of algebraic D_X-modules. In this...
Define the Collatz map Col on the natural numbers by setting
Col(n) to equal 3n+1 when n is odd and n/2 when n is even. The
notorious Collatz conjecture asserts that all orbits of this map
eventually attain the value 1. This remains open, even if...
A central goal of physics is to understand the low-energy
solutions of quantum interactions between particles. This talk will
focus on the complexity of describing low-energy solutions; I will
show that we can construct quantum systems for which the...
We will discuss a version of the Green--Tao arithmetic
regularity lemma and counting lemma which works in the generality
of all linear forms. In this talk we will focus on the qualitative
and algebraic aspects of the result.
Liouville conformal field theory is a CFT with central charge
c>25 and continuous spectrum, its correlation functions on
Riemann surfaces with marked points can be expressed using the
bootstrap method in terms of conformal blocks. We will
explain...
Liouville conformal field theory is a CFT with central charge
c>25 and continuous spectrum, its correlation functions on
Riemann surfaces with marked points can be expressed using the
bootstrap method in terms of conformal blocks. We will
explain...
The Brascamp-Lieb inequality is a fundamental inequality in
analysis, generalizing more classical inequalities such as Holder's
inequality, the Loomis-Whitney inequality, and Young's convolution
inequality: it controls the size of a product of...
We show that for every positive integer k there are positive
constants C and c such that if A is a subset of {1, 2, ..., n} of
size at least C n^{1/k}, then, for some d \leq k-1, the set of
subset sums of A contains a homogeneous d-dimensional...
