  We propose a mechanism for cogenesis of baryon and dark matter (DM) in the
universe via the Affleck-Dine (AD) route. An AD field which breaks the lepton
number symmetry, leads to the generation of lepton asymmetry by virtue of its
cosmic evolution, which then gets transferred into lepton and dark sectors.
While the lepton asymmetry gets converted into baryon asymmetry via sphalerons,
the dark sector asymmetry leads to the final DM abundance with the symmetric
part being annihilated away due to resonantly enhanced annihilation, which we
choose to be provided by a gauged $B-L$ portal. Stringent constraints from DM
direct detection forces DM and $B-L$ gauge boson masses to be light, in the few
GeV ballpark. While a large portion of the model parameter space is already
ruled out, the remaining parameter space is within sensitivity of laboratory as
well as cosmology based experiments. The AD field also plays the role of
inflaton with the required dynamics by virtue of its non-minimal coupling to
gravity, consistent with observations.
