Cosmological Averaging of Orbital Angular Momentum of Galaxy Clusters A Dynamical Origin Hypothesis for Dark Energy

The standard ΛCDM model faces a fundamental “fine-tuning” problem: the observeddark energy density is about 120 orders of magnitude smaller than the vacuum energydensity predicted by quantum field theory. This paper proposes an alternative dynamicalmechanism: the driving force of cosmic accelerated expansion may originate primarilyfrom the orbital angular momentum of the largest bound structures in the universe—galaxy clusters—under cosmological-scale statistical averaging, while dark energy needonly act as a weak “trigger” that breaks the gravitational–angular-momentum equilibrium.We demonstrate the physical self-consistency of this mechanism and show, via orderof-magnitude estimation, that the average kinetic energy density of galaxy clusters lieswithin a comparable range to the observed dark energy density. However, we also franklyacknowledge that this model does not resolve the fine-tuning problem, and may in factsharpen it: why does the released angular momentum contribute precisely the densityrequired by observations? This question is recast by the model as a problem of structureformation dynamics, but remains unanswered. Nevertheless, we present a set of unique,testable predictions distinct from ΛCDM, providing clear guidance for future sky surveys.