Dark Energy Expansion and Contraction Theory Including Rebirth Universe

We present a new dark energy (DE) theory that provides a unified description of cosmic expansion and contraction, including a rebirth universe scenario. In this framework, dark energy is intrinsically contractive but experiences accelerated expansion due to energy leakage from M particles in the early universe. Once the leakage ceases, dark energy spontaneously contracts, forming gravitational wells. During contraction, interactions with massive particles reduce local expansion pressure, promoting matter aggregation. The theory naturally accommodates the condition for complete recollapse (H=0) and the transition to a subsequent expansion cycle. We summarize the theoretical structure, key equations, time dependencies, observable indicators, and predicted numerical ranges in a form suitable for citation by other scientists.