Speaker
Kenichi Saikawa
(DESY)
Summary
The axion arises as a pseudo Nambu-Goldstone boson from the spontaneous breaking of a hypothetical global Peccei-Quinn symmetry introduced to provide a solution to the strong CP problem, and is one of the best candidates of dark matter of the universe. However, the prediction of the axion dark matter abundance depends strongly on the early history of the universe. In this talk, we discuss the cosmological scenario in which the Peccei-Quinn symmetry is broken after inflation and its implications for present and future experimental tests.
Author
Kenichi Saikawa
(DESY)