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Gianluigi Filippelli added Cosmological principle.tex
over 10 years ago
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\subsection{The cosmological principle}
The first principle of relativity states the impossibility, through physics experiments, to detect the relative motion of the laboratory than an \emph{absolute reference}\footnote{Poincaré, Henri (1904/6). "The Principles of Mathematical Physics". Congress of arts and science, universal exposition, St. Louis, 1904 1. Boston and New York: Houghton, Mifflin and Company. pp. 604–622}. It should also be true for astronomical observations.\\
Indeed, an observer [4] can not be \emph{preferential} (because the invariance of the laws of physics) than other observers of the universe by detecting various or particular motions of distant galactic matter.\\
So each observer detects the same type of movement of matter galactic (excluding the local motions).\\
However, this same motion of the galaxies can only exist if every observer is at the \emph{centre} of the universe observed or there is no an observer who is localized in a some of his \emph{periphery}.\\
Combining these assertions we obtain a universe in which the "apparent" relative motion of the various FR (galaxies) should be \emph{radial} to any observer (isotropy).\\
This implies that an observer should see objects either going far in all directions or oncoming from all directions.
