Instant preheating mechanism and UHECR

Details Instant preheating mechanism and UHECR Instant preheating mechanism and UHECR

2004-02-17

arxiv.org/abs/astro-ph/0402413v2

Phys.Rev. D70 (2004) 023003

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures, submitted to PRD

Scientific paper

10.1103/PhysRevD.70.023003

Top-down models assume that the still unexplained Ultra High Energy Cosmic Rays (UHECR's) are the decay products of superheavy particles. Such particles may have been produced by one of the post-inflationary reheating mechanisms and may account for a fraction of the cold dark matter. In this paper, we assess the phenomenological applicability of the simplest instant preheating framework not to describe a reheating process, but as a mechanism to generate relic supermassive particles as possible sources of UHECR's. We use cosmic ray flux and cold dark matter observational data to constrain the parameters of the model.

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