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We provide a comprehensive and up-to-date analysis of the prospects torealize Dark Matter (DM) in the Inert Doublet Model, while simultaneouslyenhancing the Electroweak Phase Transition (EWPhT) such as to allow forelectroweak baryogenesis. Instead of focusing on certain aspects or masshierarchies, we perform extensive, yet fine-grained, parameter space scans,where we analyze the nature of the EWPhT in both the light and the heavy DMregions, confronting it with the amount of DM potentially residing in thelightest inert-doublet state. Thereby, we point out a viable region where anon-trivial two-step EWPhT can appear, without being in conflict withdirect-detection bounds, which could leave interesting imprints ingravitational wave signatures. We propose new benchmarks with this feature aswell as update benchmarks with a strong first-order transition in the light ofnew XENON1T limits. Moreover, taking into account these latest bounds as wellas relevant collider constraints, we envisage a new region for light DM with asmall mass splitting, lifting the usual assumption of exact degeneracy of thenew non-DM scalars, such as to avoid collider bounds while providing a fair DMabundance over a rather large DM mass range. This follows from a detailedsurvey of the impact of co-annihilations on the abundance, dissecting thevarious channels.

Dark Matter and Nature of Electroweak Phase Transition with an Inert Doublet