D-brane disformal coupling and thermal dark matter

2017/08/31 by Bhaskar Dutta, Esteban Jimenez, Esteban Jimenez Moya +1
Physics and Astronomy · #Annihilation #Astrophysics #Black Holes and Theoretical Physics #Brane #Cosmology #Cosmology and Gravitation Theories #Coupling (piping) #Dark matter #Galaxies: Formation, Evolution, Phenomena #Nucleosynthesis #Particle physics #Physics #Quantum electrodynamics #Scalar (mathematics) #Supernova #Theoretical physics #astro-ph.CO #gr-qc #hep-ph #hep-th

paper · pdf · doi:10.1103/physrevd.96.103506

published as Phys. Rev. D 96, 103506 (2017) · 28 pages, 12 figures. Version to appear in PRD. Minor changes, typos corrected and reference added

arxiv created 2017/11/03 · openalex publication_date 2017/11/08 · arxiv updated 2017/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

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.

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