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

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.
7th UCLA Symposium on Sources and Detection of Dark Matter and Dark Energy in the Universe
Marina del Rey (USA)
febbraio 2006
173
56
59
M. Schelke; R. Catena; N. Fornengo; A. Masiero; M. Pietroni
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2318/76457
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