Finitism and Cosmology

> [jim]: So the MOND system needs only the observed mass and no additional mass is needed or wanted?

That is correct.

> [jim]: What about the "empty" space between galaxies? That surely has some mass which can be called dark matter or whatever and it is not observed except in the quasar spectrum-at least that is my understanding.

That mass is negligible. One gets counts of the number of absorbing atoms/molecules by examining absorption in galaxy and quasar spectra.

> [jim]: does any model include this mass?

It is negligible.

> [jim]: How does MOND explain the galaxy rotation-I know the big bang is weak on this subject.

Gravuty is still proportional to mass, but is no longer proportional to the inverse square of distance on such large scales. Crudely, it is proportional to inverse linear distance. Actually, MOND proposes that there exists a minimum possible gravitational acceleration. -|Tom|-

I have found estimates for the intergalatic medium(IGM) that range from a few protons per cubic meters upward to a few millon. What is the meta model result for this? The IGM must contain most of the mass of the universe because it is most of the volume of the universe and after all it is the home of all the galaxies.

> [jim]: I have found estimates for the intergalatic medium(IGM) that range from a few protons per cubic meters upward to a few millon. What is the meta model result for this? The IGM must contain most of the mass of the universe because it is most of the volume of the universe and after all it is the home of all the galaxies.

The IGM is included in calculations of the baryon content of the universe. This does nothing to do away with the need for "dark matter" in the Big Bang theory. -|Tom|-

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> [jim]: I have found estimates for the intergalatic medium(IGM) that range from a few protons per cubic meters upward to a few millon. What is the meta model result for this? The IGM must contain most of the mass of the universe because it is most of the volume of the universe and after all it is the home of all the galaxies.

The IGM is included in calculations of the baryon content of the universe. This does nothing to do away with the need for "dark matter" in the Big Bang theory. -|Tom|-
I am not clear on the figure here. Is the baryon count 1/m3 or 10E6/m3 according to I guess both models?

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> [jim]: I am not clear on the figure here. Is the baryon count 1/m3 or 10E6/m3 according to I guess both models?

The critical density (needed to close the universe) is a few protons per cubic meter. The actual baryon count is of order 0.2-0.3 of the critical value. -|Tom|-

You seem to be using BB model figures and terms in estimating the density of the universe. If a sample of the universe was examined the density is greater than predicted by BB. For example, say 10E80 cubic meters was the sample. It will on average contain 10E12 galaxies each with 10E11 stars with 10E57 protons. So, then the total proton count in the stars alone for the sample is 10E80. That means 2/3s of the stars do not really exist and all of space is empty if the BB estimate is correct.