TL;DR
This paper estimates the mass ranges for relic dilatons from string cosmology, considering quantum fluctuation production and reheating effects, highlighting their potential as dark matter candidates.
Contribution
It provides new estimates of relic dilaton mass windows within the pre-big bang scenario, accounting for reheating effects and their cosmological implications.
Findings
Allowed dilaton mass windows depend on string scale.
Reheating can relax phenomenological bounds.
Dilations could dominate current large-scale density.
Abstract
The allowed mass windows for a cosmic background of relic dilatons are estimated in the context of the pre-big bang scenario. The dilatons are produced from the quantum fluctuations of the vacuum, and the extension of the windows is controlled by the string mass scale. The possible relaxation of phenomenological bounds due to an intermediate stage of reheating is discussed. Even without such a relaxation, the allowed range of masses includes a light sector in which the dilatons are not yet decayed, and could provide the dominant contribution to the present large scale density.
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Taxonomy
TopicsCosmology and Gravitation Theories · Black Holes and Theoretical Physics · Particle physics theoretical and experimental studies