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Re: [Phys-l] Big Bang density corr





In a message dated 3/12/2009 2:13:12 PM Eastern Daylight Time,
JSchnick@Anselm.Edu writes:

Are you saying that the amount of (mass + energy) in the universe is
finite? What is the evidence for that?

I wonder if it is a terminology issue. Do you consider "the universe"
to be that be just that portion of the universe which is visible from
earth?




))))))))))))))))))))))))))))))))00

The amount of matter in the visible Universe is tightly constrained by
observation. We know to a high degree of certainty that omega, the density
parameter, equals 1. The tally goes like this;

Baryonic matter 1E78 quanta mass 1E6 to 1E9 ev 5%
Radiation!E87 quanta 1E-4 ev.005%
Hot Dark matter < 1 ev 1E87 quanta .3%
Cold Dark Matter 1E 11 ev 1E77 quanta 25%
Dark Energy 1E-33 ev 1E118 quanta 70%

BTW if you apply a semi Newtonian analysis to the energy condition of the
Universe you get;


E_unv = (1-omega)*E_mass

I have done a very nice proof of this.


This means that actually, the total energy in the Universe is zero.

However, this is based on subtracting out the effect of comoving frames
a somewhat dubious procedure. Energy conservation is really not well defined
with a non constant scale factor because time translation is not well defined
with a non constant scale factor. Nevertheless, the above relationship is
perhaps connected to reality nonetheless.

Bob Zannelli





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