Local Self-Screening of Zero-Point Stress and Correlation Residue as an Effective Cosmological Constant

This research note proposes a possible reformulation of the cosmological constant problem based on local monopole self-screening of zero-point stress. The large microscopic zero-point stress is not assumed to be small; rather, its local monopole component is assumed to be screened by a vacuum response required for stability, so that it does not appear directly as a long-range gravitational source. The late-time dark-energy-like component is modeled not as a finely tuned leftover of zero-point energy, but as a coarse-grained stress-correlation residue obtained through a nonlinear response-kernel projection of connected stress-tensor two-point functions. This version also includes a possible early-universe extension. The self-screening efficiency is treated as phase-dependent: an early weakly screened vacuum phase may leave a large unscreened vacuum-like stress, which can drive inflation-like expansion. The later relaxation into a self-screened phase suppresses the monopole component and may provide a phenomenological route to reheating through the release of effective vacuum-sector energy into radiation. The note explicitly discusses several major logical gaps of this extension, including the origin of the screening efficiency, the vacuum-like equation of state of the unscreened component, the separation between released vacuum energy and radiation-transfer rate, the absence of a microscopic reheating action, and the lack of derived primordial perturbation predictions. It does not claim a complete theory of the cosmological constant, inflation, or reheating, but presents an effective research program and a set of consistency conditions for further investigation.