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Abstract

The Inert Doublet Model (IDM) has been widely studied as a
possible theory explaining Dark Matter (DM) and in the context
of the Electroweak Phase Transition (EWPhT), as a first step
towards accommodating the three Sakharov conditions allowing
for baryogenesis. With this aim in mind, in this work the
IDM is extended with higher-dimensional CP-violating operators
which are added in three distinct sectors of the theory,
specifically, in the scalar potential, in the Yukawa Lagrangian,
and in the gauge sector. In each case, DM phenomenology is
extensively studied and the corresponding parameter spaces
are shown in detail, taking into account theoretical and the latest
experimental constraints. In particular, for DM masses over
500 GeV further higher-dimensional derivative operators were
also included and it is shown that a new parameter space becomes
available even for non-(quasi)degenerate scalar masses.
Similarly, in one of the extensions and for low DM masses it is
argued that the Baryon Asymmetry of the Universe (BAU) can
be explained by considering the chiral anomaly during the first
step of a two-step phase transition in the Universe. Possible
benchmark points are, likewise, analysed. We conclude that the
IDM as an effective theory could, in principle, serve as a model
where both DM and baryogenesis are accounted for.