http://arxiv.org/abs/2108.06163
Light propagation in cosmology is usually studied in the geometrical optics approximation which requires the spacetime curvature to be much smaller than the light wavenumber. However, for non-fuzzy particle dark matter the curvature is concentrated in widely separated spikes at particle location. If the particle mass is localised within a Compton wavelength, then for masses $\gtrsim10^4$ GeV the curvature is larger than the energy of CMB photons.
We consider a post-geometrical optics approximation valid for large curvature. Effectively, photons gain a gravity-induced mass when travelling through dark matter, and light paths are not null nor geodesic. We find that the correction to the redshift is negligible. For the angular diameter distance, we show how the small average density emerges from the large local spikes when integrating along the light ray. We find that there can be a large correction to the angular diameter distance, which may allow to set a strong upper limit on the mass of dark matter particles. We discuss open issues related to the validity of our approximations.
S. Koksbang and S. Rasanen
Mon, 16 Aug 21
25/34
Comments: 16+3 pages