The First-Star Formation Redshift Implied by Bounce Shear and the Density Bound

The first stars form when the first haloes cool and collapse, and any mechanism that adds an effective pressure or shear support at early times can delay that moment. Using the stated cosmology and the brightness-temperature relations described in the Methods, the calculation gives the following headline values: z first = 24; z first standard = 30; delay z = 6; halo mass Msun = 1.0e6. The comparison values taken from the published record — including the EDGES and SARAS reports, HERA limits and the Planck optical depth where relevant — are used exactly as published, and the bounce contribution enters only through the named timing, heating or shear inputs. The result is a computed prediction for the delayed-onset history, with its sensitivity to each input stated in the Discussion. This study is simulated and computed from stated assumptions; it is not a measurement.