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• TITLE: Study of Warm Dark Matter with the Lyman-α Forest (Part II)

  AUTHORS: Bruce Hoeneisen

  KEYWORDS: Lyman-Alpha Forest, Warm Dark Matter, Free Streaming, Dark Matter

  JOURNAL NAME: International Journal of Astronomy and Astrophysics, Vol.16 No.4, October 29, 2026

  ABSTRACT: Observed quasar light as a function of wavelength shows absorptions due to neutral hydrogen “clouds” along the line-of-sight. This “Lyman- α forest” has a power spectrum that has a cut-off. We study this cut-off. This cut-off may be due to warm dark matter free-streaming in the early universe, or to neutral hydrogen thermal velocity Doppler shift, or both. It is difficult to distinguish between these alternatives. If warm dark matter free-streaming dominates, we obtain the following density power spectrum cut-off wavevector: k fs =5.7±0.3±2.0 Mpc−1. This is a measure of the dark matter “warmness”. This result is in agreement with four independent published measurements, and in disagreement with published limits.