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\section{The space-time field}   \subsection{The Space-Time field}\label{spacetimefield}  %  The Einstein's Theory of Relativity \cite{einstein1922} \cite{Einstein_1922}  establishes a deep physical connection between space, time and material objects (particles-fields): we cannot describe particles and their interactions without space and time, and at the other hand space and time haven't a physical sense without particles. In conformity with that, one could assert that if particles are to be considered as an \emph{objective reality}, then also time and space shall objectively be considered as a unique \emph{real thing}.\\ So we'll call about \emph{Space-Time Object}, and also we will intend the universe, like a set of particle-fields, as a \emph{field} which nature is based on \emph{Space-Time} (ST).\\  In order to explain the nature of \emph{physical object} assigned to ST (and to the whole universe) we recall some fundamental characteristics:  \begin{enumerate}