Chris Hirata: Introduction to baryon acoustic oscillations

Baryon-acoustic oscillations are now one of the established tools for measuring the expansion history of the universe. I will give an introduction to the early universe physics that produces the BAO feature, and the cosmological information that it encodes. The complications of nonlinear galaxy clustering and survey geometry will be considered. The range of observational methods to measure the BAO features will then be discussed, highlighting recent results and future opportunities.