# School of Mathematics

## Quantum footprints of symplectic rigidity

We discuss interactions between quantum mechanics and symplectic topology including a link between symplectic displacement energy, a fundamental notion of symplectic dynamics, and the quantum speed limit, a universal constraint on the speed of quantum-mechanical processes. Joint work with Laurent Charles.

## Proofs from Algorithms, Algorithms from Proofs

## Zimmer's conjecture for co-compact lattices in simple complex Lie groups

## Intrinsic Diophantine approximation on S^3

## Contact hypersurfaces and mirror symmetry

## Getting information from Higher Dimensional Moduli Spaces in Floer theory

## Tensor rank

## Prescribing scalar curvature in high dimension

We consider the classical problem of prescribing the scalar curvature of a manifold via conformal deformation of the metric, dating back to works by Kazdan and Warner. This problem is mainly understood in low dimensions, where blow-ups of solutions are proven to be "isolated simple". We find natural conditions to guarantee this also in arbitrary dimensions, when the prescribed curvatures are Morse functions. As a consequence, we improve some pinching conditions in the literature and derive existence

results of new type. This is joint work with M. Mayer.

## On the existence of minimal Heegaard splittings

In the 80s Pitts-Rubinstein conjectured that certain kinds of Heegaard surfaces in three-manifolds can be isotoped to index 1 minimal surfaces. I'll describe in detail a proof of their conjecture and some applications. This is joint work with Liokumovich and Song.