The GD Hypothesis: A Preliminary Phenomenological Framework for Universal Momentum Reversal and Rapid Cosmic Contraction

This manuscript introduces the GD hypothesis, a preliminary theoretical framework proposing a hypothetical cosmological field associated with cosmic expansion, universal spatial momentum reversal, and rapid cosmic contraction. The hypothesis proposes that the universe may reach a critical cosmological state characterized by a vanishing Hubble parameter. At this transition, the spatial momentum of physical systems is postulated to reverse, followed by a phase of rapid cosmic contraction. The proposed framework does not require a complete reversal of time or the chronological reproduction of previous cosmic events. This manuscript presents an exploratory theoretical proposal. The physical existence of the GD field and the proposed momentum-reversal mechanism have not been experimentally established or derived from a complete dynamical theory.