This work proposes a phenomenological cosmological framework, termed Phase Expansion Instability (PEI), to investigate particle production mechanisms driven by localized space-time expansion. Under this formulation, particle production is analyzed under a threshold condition determined by the local expansion rate relative to a particle's reduced Compton wavelength. The model explores cosmological evolution by considering a metastable vacuum energy difference, tracking its conversion into matter degrees of freedom through a phenomenological decay function. The resulting dynamics demonstrate an intrinsic feedback mechanism that yields attractor-like behavior. Additionally, potential cosmological implications are discussed, including primordial gravitational-wave signatures, variations in cosmic backgrounds, and a dynamical approach to analyzing the electroweak energy scale. This framework builds upon the quantum foundational mechanisms and macro-cosmological structures discussed in our companion studies (archived on Zenodo with DOIs: 10.5281/zenodo.21288447 and 10.5281/zenodo.21288954).
Liu et al. (Fri,) studied this question.