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\subsection{The Universe's spacetime field}  The particles walking across the universe are structured like coupling of chains $\Xi_i$  of intrisic quantum oscillators, belonging to the basic field $\Xi$.\\ $\Xi$ (see structure hypothesys).\\  The birth of massive particles in the scalar field $\Xi$ of the object-universe or the bird of $\underline{\Xi}_i$-lattices means that the universe can be expressed by $\Xi$ or by $\underline{\Xi}$.\\  The field that represents the universe as a spacetime object, that we call \emph{universe's spacetime field}, is generically denoted by $\underline{\underline{\Xi}} \equiv (\Xi, \underline{\Xi})$.\\  But we must not believe that $\Xi$ is a sort of elastic \emph{ether} pervading an absolute space: we remember that this has been refuted by the theory of relativity, because it is itself the spacetime.\\