Abstract
We attempt to understand the baryon-dark matter coincidence problem within the quark seesaw extension of the standard model where parity invariance is used to solve the strong problem. The gauge symmetry of this model is extended by a dark group plus inclusion of a heavy neutral vector-like fermion charged under the dark group which plays the role of dark matter. All fermions are Dirac type in this model. Decay of heavy scalars charged under leads to simultaneous asymmetry generation of the dark matter and baryons after sphaleron effects are included. The group not only helps to stabilize the dark matter but also helps in the elimination of the symmetric part of the dark matter via annihilation. For dark matter mass near the proton mass, it explains why the baryon and dark matter abundances are of similar magnitude (the baryon-dark matter coincidence problem). This model is testable in low threshold (sub-keV) direct dark matter search experiments.
- Received 10 May 2017
DOI:https://doi.org/10.1103/PhysRevD.96.055011
© 2017 American Physical Society