Description
Motivated by the collisionless cold dark matter small scale structure problem, we propose an asymmetric dark matter model with the dark sector charged under a dark U(1)′. The media- tor between dark matter particles is the dark gauge boson, which obtains its mass through the spontaneous breaking of U(1)′. This model easily avoid the strong limits from cosmic microwave background (CMB) observation, and have a large parameter space to be consistent with small scale structure data. Furthermore, this model can explain recent pulsar timing arrays (PTAs) data by a MeV-scale first-order phase transition.
Primary author
Dr
Mengchao Zhang
(Jinan University（暨南大学）)
