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Cosmic Energy Budget, vs time
Questions (below) relate to total energy (sum of terms) in this paper:
In the paper, "The Cosmic Energy Inventory" Fukugita / Peebles, They created a list of all known forms of energy within the universe today. (They said, "We present.............at the present epoch".........which I take to mean, correct me if wrong, they are listing all forms of energy that exist within the entire modern (co moving with us) universe.) For this question I ignore all "Dark" forms of energy and focus only on the 5% that is in forms we have detected such as neutrinos, baryons, EM radiation. Ignoring Dark mass and Dark energy, the total universe energy inventory is: 1.00 - 0.954 = 0.046 and the primary 4 constituents a Neutrinos = 0.00126 Baryon Rest Mass Warm Intergalactic plasma = 0.045 Intracluster plasma = 0.0018 Main Sequence Stars spheroids and bulges, disks and irregulars 0.0015 + 0.00055 = 0.00205 These 4 components combined constitute 0.05011. (This is greater than 4.6%, so error bars must be the culprit unless I did the addition wrong.) At any rate, this 100% of known stuff (5% if we were to include dark stuff) must total to the same value no matter what age of the universe I consider, right? In other words, section 7 is post stellar radiation. section 6 is post stellar nuclear binding energy. And the energy associated with those two categories must have originally been associated with the section 3, baryon rest mass. ie, fusion energy release reduced baryon mass and increased radiation and nuclear binding energy. But the total energy (if I sum all of the forms in addition to these 3) at previous epochs of our universe would be the same as the total today, Right? In other words, 100% of this 5% of stuff we know about, has always been and always will be, 100%. The quantity of energy in each category may shuffle around a little, but the total will remain unchanged. So if I want to make a plot of this inventory as a function of age of the universe, then I should make certain to track the sum of the individual components to make sure they always sum to 100% of what 100% is today, Right? Thanks, rt |
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