Here I compare show the Lya Flux power spectrum for different UVB photoheating and photoionization rates witrh the effects of a \(m=2 \,keV\) warm dark matter.

The parameters for the UVB rates are the combinations of the following:

\[\beta_{\mathrm{He}} = \,[ \, 0.2 \,\, , \,\, 1.0 \, ]\] \[\beta_{\mathrm{H}} = \, [ \, 0.4 \,\, , \,\, 1.2 \, ]\] \[\Delta z_{\mathrm{He}} = \, [ \, -0.4 \,\, , \,\, 0.6 \,]\] \[\Delta z_{\mathrm{H}} = \, [ \, -0.4 \,\, , \,\, 0.4 \, ]\]