DESY Theory Seminar

# First Order Peccei-Quinn Phase Transitions

## by Andrea Tesi (U di Firenze)

Monday, December 2, 2019 from to (Europe/Berlin)
at Bldg 2A ( SR2 )
 Description The Peccei-Quinn axion solution to the strong CP problem implies the existence of spontaneous symmetry breaking at a very high scale. In this talk, I will discuss under which conditions such breaking can result in a first order phase transition of cosmological and phenomenological relevance, possibly within reach of future gravity wave interferometers. Models at both weak and strong coupling will be discussed.