A Testable Hypothesis for Dynamical Dark Energy as a Spatially Propagating Field

This record contains a speculative and falsifiable hypothesis proposing that dark energy may be described as a dynamical field capable of spatial propagation rather than as a uniform cosmological constant. The accompanying note outlines the physical motivation for this framework, distinguishes it from ΛCDM and homogeneous quintessence models, and identifies observational signatures in the cosmic microwave background (CMB), Integrated Sachs–Wolfe (ISW) effect, large-scale structure, and potential directional deviations in late-time cosmic expansion measurements. This work does not claim a discovery and is intended to facilitate transparent discussion, testing, and potential falsification.