Title: Spinning up structure in the late early universe

Abstract: Current and upcoming cosmological service will provide an unprecedented wealth of information about the distribution of matter on (sub)galactic scales.  These scales broadly enter the cosmic horizon between BBN and CMB epochs.  The excellent agreement between BBN and CMB observations of the early universe makes it challenging for physics beyond the standard model to yield large deviations from the predictions of standard cosmology. I will discuss a two variants of a well-motivated axion model (with Berkeley roots!) that can nonetheless alter the expansion history of the universe during this epoch. As a result, these cosmologies yield enhancements to the matter power spectrum, which can be sizable, with interesting consequences for early structure formation. 

https://lbnl.zoom.us/j/94928022788?pwd=emVQWG1mTnhSbHVqekVuenk0VEVQZz09