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David Dodson
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Does space have its own density?
i.e. a mass density distinct from the mass density of 'particles' in it?
or may it have a uniform density of some kind of vast particle(s)?
If so, would the effect on observable masses largely cancel out?
One answer from https://van.physics.illinois.edu/qa/listing.php?id=22498 :
"Q: Mass of vacuum? - Varun (age 15) India
A: So far as we can tell from the accelerating expansion of the universe, the mass density of the vacuum is about 6.5*10-27 kg/m3. If, however, some other effect is causing that acceleration, then we don't know the answer. Mike W. (published on 05/03/2013)"
Or could the density of space be somehow concentrated in the cosmic
vicinity of 'ordinary' matter and thus be a large part of 'dark matter'?
From https://en.wikipedia.org/wiki/Dark_matter (as last edited 2018/3/10):
"At present, we can only detect and study dark matter because it interacts gravitationally with "ordinary" matter. … Many different kinds of evidence agree on the extent of dark matter in the observable universe. … The primary evidence for dark matter is that calculations show that many galaxies would fly apart instead of rotating, or would not move as they do, if they did not contain a large amount of matter beyond that which we can see."
Could particles comparable in size to galaxies be involved? Or just one universal particle?
I thank Alex Dodson for proposing that space has a density of its own.
David Dodson, 2018/311
i.e. a mass density distinct from the mass density of 'particles' in it?
or may it have a uniform density of some kind of vast particle(s)?
If so, would the effect on observable masses largely cancel out?
One answer from https://van.physics.illinois.edu/qa/listing.php?id=22498 :
"Q: Mass of vacuum? - Varun (age 15) India
A: So far as we can tell from the accelerating expansion of the universe, the mass density of the vacuum is about 6.5*10-27 kg/m3. If, however, some other effect is causing that acceleration, then we don't know the answer. Mike W. (published on 05/03/2013)"
Or could the density of space be somehow concentrated in the cosmic
vicinity of 'ordinary' matter and thus be a large part of 'dark matter'?
From https://en.wikipedia.org/wiki/Dark_matter (as last edited 2018/3/10):
"At present, we can only detect and study dark matter because it interacts gravitationally with "ordinary" matter. … Many different kinds of evidence agree on the extent of dark matter in the observable universe. … The primary evidence for dark matter is that calculations show that many galaxies would fly apart instead of rotating, or would not move as they do, if they did not contain a large amount of matter beyond that which we can see."
Could particles comparable in size to galaxies be involved? Or just one universal particle?
I thank Alex Dodson for proposing that space has a density of its own.
David Dodson, 2018/311