## Speaker:

## Institution:

## Time:

## Location:

I will discuss the behavior of N bosons trapped in a potential well subject

to a pairwise interaction. In the mean-field limit -- i.e., when N tends to

infinity while keeping the interaction per particle bounded -- the evolution

of a product state remains, asymptotically, a product state. The single

particle wave-function then evolves according to a non-linear Hartree

equation. Versions of this result have been proved before, e.g., by

Hepp in 1977, Spohn in 1980 or, recently, by Rodnianski and Schlein, but

the proofs are often quite technically involved. I will describe a very simple,

and ideologically correct, proof (for bounded interaction potentials) based

on exchengeability and Stormer's (aka quantum deFinetti) theorem.

Based on recent discussions with Nick Crawford.