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• W2746561641 abstract "Conformal and Disformal couplings between a scalar field and matter occur naturally in general scalar-tensor theories. In D-brane models of cosmology and particle physics, these couplings originate from the D-brane action describing the dynamics of its transverse (the scalar) and longitudinal (matter) fluctuations, which are thus coupled. During the post-inflationary regime and before the onset of big-bang nucleosynthesis (BBN), these couplings can modify the expansion rate felt by matter, changing the predictions for the thermal relic abundance of dark matter particles and thus the annihilation rate required to satisfy the dark matter content today. We study the D-brane-like conformal and disformal couplings effect on the expansion rate of the universe prior to BBN and its impact on the dark matter relic abundance and annihilation rate. For a purely disformal coupling, the expansion rate is always enhanced with respect to the standard one. This gives rise to larger cross-sections when compared to the standard thermal prediction for a range of dark matter masses, which will be probed by future experiments. In a D-brane-like scenario, the scale at which the expansion rate enhancement occurs depends on the string coupling and the string scale." @default.
• W2746561641 created "2017-08-31" @default.
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• W2746561641 date "2017-11-08" @default.
• W2746561641 modified "2023-10-15" @default.
• W2746561641 title "D-brane disformal coupling and thermal dark matter" @default.
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• W2746561641 doi "https://doi.org/10.1103/physrevd.96.103506" @default.
• W2746561641 hasPublicationYear "2017" @default.
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