The Radionactive Universe

Details The Radionactive Universe The Radionactive Universe

2003-06-17

arxiv.org/abs/hep-ph/0306159v3

JCAP0307:008,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

v3: cosmetic changes

Scientific paper

10.1088/1475-7516/2003/07/008

In a large class of extra-dimensional models, a scalar degree of freedom known as the radion is long-lived, or even stable, on cosmological scales. In this paper we investigate the impact of radionactivity on the evolution of the universe. We demonstrate that whether the radion overcloses the universe, constitutes the dark matter, is the inflaton, the curvaton, or does not play any role in cosmology, depends crucially on the ratio between the energy densities stored in the radion and in the inflaton at the time of inflation. We discuss the general difficulties reconciling models with low compactification scale (i.e., TeV scale) with the simple picture of inflation.

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