Baryon and Dark Matter Genesis from Strongly Coupled Strings
  D3-brane probes of E-type Yukawa points lead to strongly coupled nearly
conformal sectors nearby the Standard Model (visible sector) which are
motivated by F-theory GUTs. Realistic visible sector brane configurations
induce a seesaw mass hierarchy in the hidden sector with light GUT singlets
charged under a strongly coupled hidden sector U(1). Interpreting these GUT
singlets as dark matter, this leads to a matter genesis scenario where the
freeze out and subsequent decay of heavy mediators between the two sectors
simultaneously populates comparable amounts of baryon and dark matter
asymmetry. Generating a net matter asymmetry requires a generational structure
in the probe sector which is absent at weak string coupling, but is
automatically realized at strong string coupling via towers of dyonic bound
states corresponding to multi-prong string junctions. The hidden U(1) couples
to the visible sector through both electric and magnetic kinetic mixing terms,
providing an efficient means to deplete the symmetric component of dark matter.
The mass of the dark matter is of order ~ 10 GeV. The dark matter mass and the
matter asymmetry are both controlled by the scale of conformal symmetry
breaking ~ 10^(9) - 10^(13) GeV, with the precise relation between the two set
by details of the visible sector brane configuration.
