
This work presents the consolidated formulation of the Σ (Sigma) framework, in which spacetime is treated as an emergent geometric description of a physical substrate with finite response. A universal curvature bound is introduced as a fundamental physical postulate, and its relation to General Relativity and effective geometric models is discussed. This version supersedes earlier exploratory drafts and focuses on the conceptual and physical foundations of the theory. Este trabajo presenta la formulación consolidada del marco Σ (Sigma), en el cual el espacio-tiempo se interpreta como una descripción geométrica emergente de un sustrato físico con respuesta finita. Se introduce un límite universal de curvatura como postulado físico fundamental y se discute su relación con la Relatividad General y con modelos geométricos efectivos. Esta versión sustituye borradores exploratorios previos y se centra en los fundamentos conceptuales y físicos de la teoría.
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