deletions | additions       diff --git a/Cosmological principle.tex b/Cosmological principle.tex  index a4d86c3..295cdd9 100644  --- a/Cosmological principle.tex  +++ b/Cosmological principle.tex 
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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. directions.\\   Astronomical observations confirms the picture of an expanding universe, but we observe that cosmological (relativistic) principles are stated also for a contracting universe.\\   The expansion (or contraction) could not be deducted by the principles of the relativity [4], so we should suppose that the expansion (contraction) is a property of the spacetime field of the universe, unlike the classical cosmology, where the expansion of the universe is an empirical law, consistent with homogeneity and isotropy of the universe.\\   Some thesis like:   \begin{enumerate}   \item Build a local spacetime frame reference using a massive coupling of the field $\underline{\Xi}$.   \item Set to a massive particle a space dimension given by its Compton wavelength $\not \lambda_c$.   \end{enumerate}   suggest us to think that the expansion of the universe is connected to the massive coupling, associated to a massive particle.\\   Indeed, when a massive particle rises with its spacetime lattice, a bit of spacetime is added to the universe's field $\underline{\underline{\Xi}}$, because every massive particle is itself spacetime.\\   However we believe that only some processes of pair creation should conduce to the creation of space and time in the universe. Following the Standard Model we suppose that the basic fermions (electron, for leptons, and proton, viewed like quarks u, d, for barions) can determine the processes of space-mass creation in the universe, because they are basic structures for the IQuO's couplings.