Phenomenology of wavelike vector dark matter nonminimally coupled to gravity

Abstract

AbstractWe 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 |ξ1|/m2≪ 1050eV-2and -3 × 1046eV-2≲ξ2/m2≲ 8 × 1048eV-2.