Cosmology of a sentient information sector: a thermodynamic information–energy bridge, dynamical dark matter and dark energy, and three perturbative signatures

This preprint develops the cosmology of a sentient information sector: an extension of the Einstein equations in which the dark sector is sourced by a scalar field carrying integrated-information density. The construction proceeds through three layers. First, a thermodynamic information–energy bridge relates energy density to integrated information through a non-linear maintenance function, recovering the linear Landauer relation as a limiting case. Second, accumulated information is modelled as a pressureless component reproducing cold-dark-matter phenomenology at background level, while a geometric tensor from a Kaluza–Klein reduction on a Kähler moduli space generates perturbative signatures. Third, a dynamical information sector with logarithmic potential supports a late-time stable spiral fixed point and provides a semi-analytic route to dynamical dark energy. The paper identifies three perturbative signatures distinguishing the model from ΛCDM, warm dark matter, fuzzy dark matter and self-interacting dark matter: a non-zero effective sound speed, a non-zero anisotropic stress, and a Bardeen-ratio anomaly. It also proposes a scale-dependent sentient bias and a cross-correlation between weak-lensing dark-matter maps and a cosmic-biological-complexity index. Numerical values are presented as semi-analytic reference scales, not as results from a validated likelihood pipeline. The paper includes explicit falsification conditions and a post-2030 observational program.