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An amateur story of space

PostPosted: September 6th, 2020, 6:19 am
by socrat44
An amateur story of space
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Euclid created mathematical 2-D space
Euclidean space is a scene where the Earth events take place
Euclidean math space is an absolute and rigid, nothing can change it
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In 1908 Minkowski mathematically showed that Einstein's
SR theory would be more beautiful if to use 4-D.
Most important, the 4-D is as flat as 2-D, only one (2-D) is used
as Earth scene and another (4-D) is used as a Cosmic scene.
And from Cosmic view the Earth's scene is looked as the 3-D.
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During 1830 - 1854 Lobachevsky, János Bolyai and Riemann separately
and independently had an idea, maybe, some ''hidden force'' can change
the Euclidean 2-D. And they created non-Euclidean geometry.
Many years this mathematical idea was considered as an abstract idea
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But in 1915 Einstein by using Riemann geometry
(plus using ''hidden matter'' -- mass and energy)
showed that the Riemann geometry can have practical profit.
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The Earth ''empty'' space (air) is filled with different molecules
The Cosmic ''empty'' space (vacuum) is filled with different ''virtual particles''
Both spaces are real.
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Re: An amateur story of space

PostPosted: September 26th, 2020, 2:31 pm
by socrat44
We know the physical laws on the Earth scene,
we don't know the physical laws on the Cosmic scene.
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Re: An amateur story of space

PostPosted: September 27th, 2020, 2:02 am
by socrat44
According to the WMAP (2013 measurement) the
 Cosmic Space is ''pretty flat'' to within 0,4% - 0,5%
The planet Earth (stars) is a local macro gravity - ''ball''
in the cosmic space
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The universe (as a whole) is homogenous, isotopic, smooth. flat.
Gravity is a cosmic place where the local space is not flat . . .
Gravity masses are only about 5% in the whole universe . . .
Only about 5% of whole space is curved (Riemann geometry)
 and 95% of cosmic space is a flat, smooth, cold continuum.