# Colloquium: Understanding primordial physics in a finite universe

## Main Content

Most cosmological models predict a universe vastly larger than what we can observe today. I will explain how the finiteness of our observable universe adds a significant uncertainty in connecting the statistics of the density inhomogeneities with particle physics models for their origin. While classical cosmological statistics are somewhat less informative than one might like, the quantum part of this story is intriguing: our observable universe is an open quantum system where gravity is a key player. I will discuss the good and the bad in how these results affect the outlook for learning more about very high energy physics from early universe cosmology.