Dark energy, scalar singlet dark matter and the Higgs portal

Understand

One of the simplest extensions of the Standard Model (SM) comprises the inclusion of a massive real scalar field, neutral under the SM gauge groups, to be a dark matter candidate.

• The addition of a dimension-six term into the potential of the scalar dark matter enables the appearance of a false vacuum that describes the cosmic acceleration.
• We show that the running of the singlet self-interaction and the Higgs portal coupling differs from the standard scalar singlet dark matter model.
• If we maintain a positive quartic coupling, it is also possible to describe the accelerated expansion of the Universe through a false vacuum with the addition of a dimension-eight interaction term.