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Hunting Thermal Relics in the DESI DR1 Ly$α$ Forest
We investigate constraints on additional relativistic species and thermal sterile neutrinos using the DESI DR1 one-dimensional Lyman-$α$ forest power spectrum, combined with Planck 2018 CMB and DESI DR2 BAO measurements. We consider both the $Λ$CDM+$N_{\rm eff}$ extension and a thermal with a differ
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