Two Component Doublet-Triplet Scalar Dark Matter stabilising the Electroweak vacuum

TL;DR

This paper proposes a two-component scalar dark matter model with a doublet and a triplet that explains relic abundance and stabilizes the electroweak vacuum up to the Planck scale, highlighting inter-conversion effects.

Contribution

It introduces a novel two-component scalar dark matter model with specific inter-conversion dynamics that achieve relic abundance and vacuum stability.

Findings

Inter-conversion explains relic abundance in the desert mass region.

Model stabilizes electroweak vacuum up to the Planck scale.

Sub-TeV triplet component compatible with observed dark matter relic.

Abstract

A two-component scalar DM scenario comprising an additional scalar doublet and a $Y$ = 0 scalar triplet is proposed. Key features of the ensuing dark matter phenomenology are highlighted with emphasis on inter-conversion between the two dark matter components. For suitable choices of the model parameters, we show that such inter-conversion can explain the observed relic abundance when the doublet dark matter component has mass in the \emph{desert} region while the triplet component has sub-TeV mass. This finding is important in the context of such mass regions known to predict under-abundant relic for the standalone cases of the scalar doublet and triplet. In addition, we also show that the present scenario can stabilise the electroweak vacuum up to the Planck scale in the parameter space responsible for the requisite dark matter observables.