The Cabinet Theory

We introduce a five-dimensional geometric framework in which gravity propagates throughan additional extrinsic time-like dimension, while each quantum field evolves within its ownintrinsic (3 + 1)-dimensional spacetime endowed with an internal time coordinate. The resultingmanifold carries an ultrahyperbolic metric of signature diag(−,+,+,+,−), wherethe fifth coordinate is explicitly temporal, non-compact, and non-periodic. This structure,termed the Temporal Cabinet, induces a universal temporal scaling relation between intrinsicand extrinsic times, providing a geometric origin for relativistic time dilation, inertialmass, and the apparent subluminal propagation of particles, while preserving local Lorentzinvariance within each intrinsic sector. The framework replaces inflation with a purely geometric,nonsingular bounce driven by higher-curvature dynamics and a symmetry-protectedzero total energy constraint. Despite the presence of multiple time directions, the theory is shown to be dynamicallyconsistent and unitary. Through canonical reduction and full constraint-algebra closure,the Hamiltonian is rendered essentially self-adjoint and evolution is governed by relationaldynamics rather than naive Cauchy data. We derive the complete action, field equations,Noether charges, and Hamiltonian constraint, and demonstrate ghost freedom, anisotropysuppression, and quantum vacuum stability as direct consequences of five-dimensional diffeomorphisminvariance. Linear cosmological perturbations satisfy a five-dimensional Mukhanov–Sasaki equation whose solutions yield a nearly scale-invariant scalar spectrum with suppressedtensor modes, generated without inflation or exotic matter. The Temporal Cabinetprovides a unified geometric resolution to the initial singularity, matter–antimatterasymmetry, vacuum energy cancellation, and cyclic cosmological evolution within a single,mathematically closed framework.