In certain time-dependent backgrounds there are nonstandard
light strings that are created classically at an instant and cannot
be approximated by particles. We discuss the implications of these
strings to black holes and cosmology.
Through the random matrix analogy, Fyodorov, Hiary and Keating
conjectured very precisely the typical values of the Riemann zeta
function in short intervals of the critical line, in particular
their maximum. Their prediction relied on techniques...
In Euclidean geometry, bisectors are perpendicular lines. In
random plane geometry, the situation is more complicated. I will
describe bisectors in the directed landscape, the universal
geometry in the KPZ class. These help answer some open...
Centers of galaxies are fertile environments for a variety of
dynamical processes, owing to the high density of stars and the
presence of a central supermassive black hole. Stars may
occasionally be deflected onto a deadly trajectory, passing
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...
In this talk, I will describe recent progress on moduli
stabilization in string theory. In particular, I will describe
recently found supersymmetric AdS_4 vacua, with exponential scale
separation, of type IIB string compactifications on O3/O7...
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...