Cutoff in the Lyman-$α$ forest power spectrum: warm IGM or warm dark matter?
arXiv:1510.07006 · doi:10.1016/j.physletb.2017.08.022
Abstract
We re-analyse high redshift and high resolution Lyman-$α$ forest spectra considered in (Viel et al 2013), seeking to constrain the properties of warm dark matter particles. Compared to this previous work, we consider a wider range of thermal histories of the intergalactic medium. We find that both warm and cold dark matter models can explain the cut-off observed in the flux power spectra of high-resolution observations equally well. This implies, however, very different thermal histories and underlying re-ionisation models. We discuss how to remove this degeneracy.
Accepted in Physics Letters B