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Old 01-06-2018, 02:01 AM
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socratus socratus is offline
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Join Date: Aug 2011
Location: Israel
Posts: 375
'' A world without masses, without electrons, without an
electromagnetic field is an empty world. Such an empty
world is flat. But if masses appear, if charged particles
appear, if an electromagnetic field appears then our world
becomes curved. Its geometry is Riemannian, that is, non- Euclidian.''
/ Book 'Albert Einstein', the page 116, by Leopold Infeld. /
Masses (like Sun's) can appear only in local places and therefore
the curvature can appear only in local places.

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