Previous Conferences & Workshops

Mar
20
2019

Symplectic Dynamics/Geometry Seminar

Equivariant and nonequivariant contact homology
2:00pm|Simonyi Hall 101

I will discuss joint work with Hutchings which constructs nonequivariant and a family floer equivariant version of contact homology. Both theories are generated by two copies of each Reeb orbit over Z and capture interesting torsion information. I...

Mar
19
2019

Variational Methods in Geometry Seminar

Multiplicity One Conjecture in Min-max theory
3:30pm|Simonyi Hall 101

I will present a proof with some substantial details of the Multiplicity One Conjecture in Min-max theory, raised by Marques and Neves. It says that in a closed manifold of dimension between 3 and 7 with a bumpy metric, the min-max minimal...

Mar
19
2019

Symplectic Dynamics Working Group

Properties of Feral Pseudoholomorphic Curves
1:30pm|Simonyi Hall Classroom 114

I will discuss some technical details regarding properties of feral pseuodoholomorphic curves, specifically those properties arising from stretching constructions and as components of limit buildings arising from attempts to compactify certain...

Mar
19
2019

Variational Methods in Geometry Seminar

Gap and index estimates for Yang-Mills connections in 4-d
1:00pm|Simonyi Hall 101

In this talk I want to discuss two related questions about the variational structure of the Yang-Mills functional in dimension four. The first is the question of 'gap' estimates; i.e., determining an energy threshold below which any solution must be...

Mar
19
2019

Computer Science/Discrete Mathematics Seminar II

A Brief Tour of Proof Complexity: Lower Bounds and Open Problems
10:30am|Simonyi Hall 101

I will give a tour of some of the key concepts and ideas in proof complexity. First, I will define all standard propositional proof systems using the sequent calculus which gives rise to a clean characterization of proofs as computationally limited...

Mar
18
2019

Symplectic Dynamics/Geometry Seminar

Minimal Sets and Properties of Feral Pseudoholomorphic Curves
3:30pm|Simonyi Hall 101

I will discuss some current joint work with Helmut Hofer, in which we define and establish properties of a new class of pseudoholomorhic curves (feral J-curves) to study certain divergence free flows in dimension three. In particular, we show that...

Mar
18
2019

Members’ Seminar

Tracking trajectories in Hamiltonian systems using holomorphic curve tools.
2:00pm|Simonyi Hall 101

The goal is to describe how techniques from symplectic dynamics can be used to study orbit travel in three dimensions, for systems like the restricted 3-body problem from celestial mechanics. The pseudo-holomorphic curve theory initiated by Hofer...