This record contains the revised version (v2.0) of a phenomenological extension of the cosmological constant inspired by the Selector-Time Theory (STT). In this work, the standard assumption of a strictly constant cosmological term is relaxed through the introduction of a structured redshift-dependent formulation Λ(z), based on a bounded transformation z/(1+z). This formulation is motivated by a structural decomposition framework in which effective physical behavior emerges from a dominant component combined with residual corrections. The model is tested against the Pantheon+ Type Ia supernova compilation, providing an integrated probe of the expansion history of the Universe. The results show a consistent improvement over the standard ΛCDM model (Δχ² ≈ -5.7), indicating that structured variation in the cosmological sector may offer a viable extension of the standard cosmological model. This article represents the deterministic stage of the STT cosmological program. A complementary Bayesian validation using MCMC methods is developed in a companion article. This version includes scientific revision, improved methodological clarity, and full bilingual alignment (Portuguese and English). All scripts, figures, and outputs are provided to ensure full reproducibility.
Izairton Oliveira de Vasconcelos (Sun,) studied this question.