期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 12, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2015/12/011
关键词
modified gravity; dark matter experiments; physics of the early universe; dark energy theory
We revisit the calculation of dark matter relic abundances in scalar-tensor gravity using a generic form A(phi(*)) = e(*)(beta phi)(2/2) for the coupling between the scalar field phi(*) and the metric, for which detailed Big Bang Nucleosynthesis constraints are available. We find that BBN constraints restrict the modified expansion rate in these models to be almost degenerate with the standard expansion history at the time of dark matter decoupling. In this case the maximum level of enhancement of the dark matter relic density was found to be a factor of similar to 3, several orders of magnitude below that found in previous investigations.
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