Cosmology after the Cosmological Constant: A CoreLumen Perspective on Dark Energy, Dark Matter, and Black Holes

The cosmological constant problem, dark energy, dark matter, and black holes have long been treated as separate and largely disconnected mysteries. CoreLumen Cosmology does not approach them as isolated puzzles. Instead, it reframes them as structurally related phenomena that must be understood within a single theoretical perspective. Modern cosmology has traditionally explained cosmic acceleration by appealing to the cosmological constant, implicitly assuming that gravity must respond to spacetime-constant vacuum energy. The central difficulty, however, lies not in the magnitude of vacuum energy itself, but in why gravitational response is assumed to couple indiscriminately to constant sources. CoreLumen Cosmology reexamines this assumption at its foundation. Rather than introducing new components or relying on parameter fine-tuning, it proposes a reorganization of gravitational response at a structural level. At the core of the framework lies a local gravitational response constraint, through which spacetime-constant vacuum energy is rendered gravitationally inert, independently of its magnitude or quantum renormalization. Dynamical contributions, by contrast, remain fully active and continue to govern cosmic expansion and structure formation. Within this structure, late-time acceleration emerges naturally, without interfering with the growth of cosmic structure. From this reorganized viewpoint, dark energy, dark matter, and black holes no longer appear as competing or ad hoc ingredients. They arise as distinct dynamical roles encoded within a single complex condensate, each associated with a specific mode of gravitational response. As a result, the background cosmology is radiatively stable against constant vacuum-energy shifts, while small but structured residual effects persist at the level of cosmological perturbations. This work does not claim a microscopic origin for dark sectors, does not speculate on early-Universe physics, and does not modify the fundamental laws of gravity. Instead, it addresses a more basic question: how cosmology may be reformulated once the cosmological constant is no longer taken as a privileged gravitational source. This manuscript is intended as a canonical reference for the CoreLumen perspective, providing a coherent structural framework from which further theoretical and phenomenological investigations may proceed.