Dark matter relic density in scalar-tensor gravity revisited

Journal Article · Tue Dec 01 00:00:00 EST 2015 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2015/12/011· OSTI ID:22525144

Meehan, Michael T.

We revisit the calculation of dark matter relic abundances in scalar-tensor gravity using a generic form A(φ{sub *}) = e{sup βφ{sub *}{sup 2/2}} for the coupling between the scalar field φ{sub *} 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 ∼ 3, several orders of magnitude below that found in previous investigations.

• OSTI ID: 22525144
• Journal Information: Journal of Cosmology and Astroparticle Physics, Vol. 2015, Issue 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COUPLING
DECOUPLING
DENSITY
GRAVITATION
LIMITING VALUES
METRICS
NONLUMINOUS MATTER
NUCLEOSYNTHESIS
SCALAR FIELDS
SCALARS
TENSORS