Abstract
We propose an economical model in which a singlet 2-odd scalar field accounts for the primordial inflation and the present dark matter abundance simultaneously in the light of recent BICEP2 result. Interestingly, the reheating temperature and the thermal dark matter abundance are closely connected by the same interaction between the singlet scalar and the standard model Higgs. In addition, the reheating temperature turns out to be quite high, TR ≳ 1012 GeV, and hence the thermal leptogenesis is compatible with this model. Therefore, it can be one of the simplest cosmological scenarios.
Highlights
Introduction and SummaryRecently, the BICEP2 experiment discovered the B-mode polarization in the cosmic microwave background (CMB) anisotropy, which is interpreted as the primordial gravitational waves of the inflationary origin [1]
Motivated by the recent observation of the B-mode polarization by the BICEP2 experiment, we have considered a scenario that the chaotic inflation is induced by a singlet scalar field with the running kinetic term, and it simultaneously becomes dark matter (DM) in the present Universe
The key point is that the inflaton is heavy at the large field value where inflation happens, while it can be so light around the potential minimum that its thermal relic abundance can match with observed DM abundance
Summary
The BICEP2 experiment discovered the B-mode polarization in the cosmic microwave background (CMB) anisotropy, which is interpreted as the primordial gravitational waves of the inflationary origin [1]. As the Universe expands, the annihilation of the inflaton particles again decouples from the thermal plasma at late time, which leads to the standard freeze-out DM production. This scenario typically results in a high reheating temperature TR 1012 GeV that is compatible with the thermal leptogenesis [14]. The coupling g, which determines the present relic DM abundance, determines the reheating temperature of the Universe In this sense, the model we propose is quite economical:♣1 we can explain the inflation, reheating and DM consistent with observations by just adding a real scalar φ
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