Expansion–Contraction Dynamics of Dark Energy Including a Regenerative Universe (Version 2)

In this paper, we present a theoretical framework that describes cosmic acceleratedexpansion and possible future contraction in a unified manner, based on theinternal dynamics of dark energy.In this model, dark energy is assumed to possess an intrinsic, weakly contractiveproperty. The currently observed accelerated expansion is sustained by energysupplied from M-particles generated in the early universe.In particular, we focus on the possibility that this energy supply can be effectivelydescribed as a leakage from the soft component of the Higgs field, rather thanfrom the mass-generation mechanism itself. As cosmic expansion proceeds and thisleakage gradually diminishes or ceases, dark energy naturally transitions to acontractive regime, leading to a monotonic decrease of the Hubble parameter andpotentially reaching the complete recollapse condition H = 0.This framework remains consistent with Λ CDM within observational limits, whilenaturally incorporating a future contraction phase and a possible transition to asubsequent expansion cycle.Observationally, the model can be tested through a dual strategy involving temporalbehavior of the Integrated Sachs – Wolfe (ISW) effect and CMB V-modepolarization. We summarize the basic structure of the theory, key equations, timedependence, and observable quantities with estimated numerical ranges, in a formsuitable for verification and citation by researchers.