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Constraints on neutrino -- dark matter interactions from cosmic microwave background and large scale structure data
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We update a previous investigation of cosmological effects of a non-standard interaction between neutrinos and dark matter. Parameterizing the elastic-scattering cross section between the two species as a function of the temperature of the universe, the resulting neutrino-dark matter fluid has a non-zero pressure, which determines diffusion-damped oscillations in the matter power spectrum similar to the acoustic oscillations generated by the photon-baryon fluid. Using cosmic microwave background data in combination with large scale structure experiment results, we then put constraints on the fraction of the interacting dark matter component as well as on the corresponding opacity.
Forward citations
Cited by 3 Pith papers
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High resolution Lyman-{\alpha} forest constraints on dark matter-neutrino scattering
The Lyman-alpha forest constrains dark matter-neutrino scattering to u_nu_chi < 1.5e-8 (95% C.L.), excluding previously claimed hints of a non-zero interaction.
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21 cm Cosmology Sensitivity to Small-Scale Structure: Warm vs Neutrino-Interacting Dark Matter
21 cm forecasts show HERA can detect νDM interactions down to ~3×10⁻³⁵ cm² (assuming zero modelling error) but cannot distinguish νDM from warm dark matter.
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Cosmological impact of $\nu$DM interactions enhanced in narrow redshift ranges
A redshift-limited dark matter-neutrino interaction reproduces the observed preference for non-zero coupling in CMB and cosmic shear data and evades small-scale structure bounds.
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