Cosmological Constant, Dark Matter, and Electroweak Phase Transition

Details Cosmological Constant, Dark Matter, and Electroweak Phase Transition Cosmological Constant, Dark Matter, and Electroweak Phase Transition

2011-08-25

arxiv.org/abs/1108.5193v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

58 pages, 10 figures

Scientific paper

10.1103/PhysRevD.84.103513

Accepting the fine tuned cosmological constant hypothesis, we have recently proposed that this hypothesis can be tested if the dark matter freeze out occurs at the electroweak scale and if one were to measure an anomalous shift in the dark matter relic abundance. In this paper, we numerically compute this relic abundance shift in the context of explicit singlet extensions of the Standard Model and explore the properties of the phase transition which would lead to the observationally most favorable scenario. Through the numerical exploration, we explicitly identify a parameter space in a singlet extension of the standard model which gives order unity observable effects. We also clarify the notion of a temperature dependence in the vacuum energy.

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