The arrow of time the observed asymmetry between past and future remains unexplained by the time-symmetric dynamical laws of both classical and quantum mechanics.We show that within the Stochastic Rupture (SR) framework, temporal directionality emerges as a direct and parameter-free consequence of the nonlinear sink term in the SR master evolution equation for the informational saturation eld χ(x µ). Branches directed toward the past carry systematically higher informational cost than branches directed toward the future: past-directed branches must be consistent with the already-pruned informational record, whereas future-directed branches propagate into capacity that has not yet been occupied. This asymmetry in pruning cost, encoded in the −αχ2 term of the master equation, is irreversible by construction and generates a preferred temporal direction without postulating a low entropy initial condition as a primitive. The framework recovers the thermodynamic arrow, the radiation arrow, and the quantum measurement arrow as three aspects of the same underlying mechanism. We state every postulate explicitly, identify the residual open problem of the initial saturation boundary condition, and list discriminating predictions.
GUILHERME ZAMBUZI (Fri,) studied this question.