Many interesting cosmological models predict an enhancement of the Hubble expansion rate in the early Universe. Among these are some braneworld models, models with a kination phase and scalar-tensor models. In this paper we show that the pre–Big–Bang–Nucleosynthesis (pre-BBN) enhancement can be strongly constrained by the combined use of the bounds on the Dark Matter relic density and antiproton production. For a Dark Matter particle of 100 GeV the maximal enhancement of the Hubble rate ranges from a few up to a factor of 30.
Constraining the early Hubble rate using cosmic antiprotons
FORNENGO, Nicolao;
2007-01-01
Abstract
Many interesting cosmological models predict an enhancement of the Hubble expansion rate in the early Universe. Among these are some braneworld models, models with a kination phase and scalar-tensor models. In this paper we show that the pre–Big–Bang–Nucleosynthesis (pre-BBN) enhancement can be strongly constrained by the combined use of the bounds on the Dark Matter relic density and antiproton production. For a Dark Matter particle of 100 GeV the maximal enhancement of the Hubble rate ranges from a few up to a factor of 30.
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