Observable Gravitational Waves in Minimal Scotogenic Model
  We scrutinise the widely studied minimal scotogenic model of dark matter (DM)
and radiative neutrino mass from the requirement of a strong first order
electroweak phase transition (EWPT) and observable gravitational waves at
future planned space based experiments. The scalar DM scenario is similar to
inert scalar doublet extension of standard model where a strong first order
EWPT favours a portion of the low mass regime of DM which is disfavoured by the
latest direct detection bounds. In the fermion DM scenario, we get newer region
of parameter space which favours strong first order EWPT as the restriction on
mass ordering within inert scalar doublet gets relaxed. While such leptophilic
fermion DM remains safe from stringent direct detection bounds, newly allowed
low mass regime of charged scalar can leave tantalising signatures at colliders
and can also induce charged lepton flavour violation within reach of future
experiments. While we get such new region of parameter space satisfying DM
relic, strong first order EWPT with detectable gravitational waves, light
neutrino mass and other relevant constraints, we also improve upon previous
analysis in similar model by incorporating appropriate resummation effects in
effective finite temperature potential.
