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.
@article{arxiv.1510.07006,
title = {Cutoff in the Lyman-$\alpha$ forest power spectrum: warm IGM or warm dark matter?},
author = {Antonella Garzilli and Alexey Boyarsky and Oleg Ruchayskiy},
journal= {arXiv preprint arXiv:1510.07006},
year = {2017}
}