Kavli Affiliate: Gordan Krnjaic
| First 5 Authors: Dan Hooper, Dan Hooper, , ,
| Summary:
We explore a simple and predictive dark matter scenario involving a complex
scalar field, $phi$, coupled to the Higgs portal with no additional field
content. In the UV, the field possesses a global $U(1)$ symmetry which is
broken by mass terms and Higgs portal interactions. In the mass basis, the
complex field splits into a pair of real scalars with a small mass splitting
(in analogy to pseudo-Dirac fermions), such that the Higgs portal acquires both
diagonal and off-diagonal terms with respect to these eigenstates. In the
parameter space where the off-diagonal interaction predominates, this scenario
is safe from direct detection constraints. Moreover, this model provides a
viable explanation for the longstanding Galactic Center gamma-ray excess.
Additionally, this model influences the Higgs potential in a way that could
facilitate a strong first-order electroweak phase transition in the early
universe, potentially leading to a stochastic gravitational wave background
that could fall within the reach of upcoming space-based detectors.
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