Limit Theorems Under Several Linear Constraints

We study vectors chosen at random from a compact convex polytope in ${\mathbb{R}}^n$ given by a finite number of linear constraints. We determine which projections of these random vectors are asymptotically normal as $n\to \mathrm{\infty }$. Marginal distributions are also studied, showing that in the large $n$ limit random variables under linear constraints become i.i.d. exponential under a rescaling. Our novel approach is based on a complex de Finetti theorem revealing an underlying independence structure as well as on entropy arguments.