Leptogenesis in Inflationary models with Non-Abelian Gauge Fields
  A scenario of leptogenesis was introduced in [1] which works during
inflationary period within standard model of particle physics setup. In this
scenario lepton number is created by the gravitational chiral anomaly which has
a non-zero expectation value for models of inflation driven by pseudoscalar
field(s). Here, we observe that models of inflation involving non-Abelian gauge
fields, e.g. the chromo-natural inflation [2] or the gauge-flation [3], have a
parity-violating tensor mode (graviton) spectrum and naturally lead to a
non-vanishing expectation value for the gravitational chiral anomaly.
Therefore, one has a natural leptogenesis scenario associated with these
inflationary setups, \emph{inflato-natural leptogenesis}. We argue that the
observed value of baryon-to-photon number density can be explained in a natural
range of parameters in these models.
