1806.08371
Novel constraints on non-cold (non-thermal) Dark Matter from Lyman-$\alpha$ forest data
Murgia, Iršic, Viel
Present an efficient method for constraining both thermal and non-thermal DM scenarios with the Ly-a forest, based on a simple and flexible parameterization capable to reproduce the small scale clustering signal of a large set of non-cold (nCDM) models. By using a large suite of hydro sims, determine constraints on both astrophysical, cosmological and nCDM parameters by performing a full MCMC analysis. Obtain a marginalized upper limit on the largest possible scale at which a power suppression induced by nearly any nCDM scenario can occur, i.e. alpha<0.03 Mpc/h (2sigma CL). Explicitly describe how to test several of the most viable nCDM scenarios without the need to run any specific numerical simulations, due to the novel parameterization proposed, and due to a new scheme that interpolates between the cosmo models explored. The shape of the linear matter power spectrum for standard thermal warm DM models appear to be in mild tension (~2 sigma CL) with the data, compared to non-thermal scenarios. This is the first sturdy that allows to probe the linear small scale shape of the DM power spectrum for a large set of nCDM models.
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