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arXiv · 2305.03841

Phenomenology of wavelike vector dark matter nonminimally coupled to gravity

Hong-Yi Zhang·Siyang Ling
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Abstract

We study three astrophysical/cosmological consequences of nonminimal couplings to gravity in wavelike vector dark matter. In the nonrelativistic limit, the nonminimal coupling with the lowest mass dimension leads to effective self-interactions that affect the mass-radius relation of vector solitons, growth of linear perturbations during structure formation, and the speed of gravitational waves (GWs). Based on the success of cold dark matter on large-scale perturbations and the current limits on GW speed, we constrain the dark matter mass and nonminimal coupling strength to be within the range $|\xi_1| / m^2 \ll 10^{50} \mathrm{eV^{-2}}$ and $-3\times 10^{46} \mathrm{eV^{-2}} \lesssim \xi_2 / m^2 \lesssim 8 \times 10^{48} \mathrm{eV^{-2}}$.

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Hong-Yi Zhang, Siyang Ling. 2023-05-05. Phenomenology of wavelike vector dark matter nonminimally coupled to gravity. https://doi.org/10.1088/1475-7516%2F2023%2F07%2F055

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