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Reionization Energy or Universe Mass Budget
[Moderator's note: Reformatted. PLEASE limit unquoted lines to 72
characters or so! -P.H.] I haven't figured out how to calculate this value, should be simple so I'm just missing something I think. From Madau plots etc., I get star formation rates and luminosity over age of universe. The universe began with a finite quantity of baryonic mass, mostly H and He with trace of Li. So the remaining gas is whatever the total is, minus the the quantity that collapsed and turned into (first) stars during reionization. I've seen some plots that show about 700M years for this process, but take it that this is under study still. I am wondering what the total energy required to re ionize was (total for the "observable universe today") I can get the energy per H ionization easily. So if I knew the total mass of the universe and the fraction that formed into first stars, I could do the calculation. Is this energy value well known, and or are any of the values needed to calculate it known? I've seen DE and DM vs normal matter showing ratios like 95% dark stuff DE + DM and 5% atoms. But to get an actual value, I need so mething like kg per Mpc^3 in gas and in stars during reionization period. Any direction appreciated. rt |
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