A closed loop universe model with perfect matter-antimatter symmetry.

Based on the CPT theorem and two hypothetical principles: (1) Spacetime has no boundaries, and (2) Physics has no infinities, a closed loop topology follows naturally. The universe is a closed 3-space, almost (but not perfectly) flat, much vaster than the visible part. The time of the CPT theorem, with Charge conjugation, Parity, and Time reversal each being perfect symmetries with electrons, positrons and photons (QED) is different from the time of complex systems (entropic and psychological time). The origin at the Planck scale (not a singularity, infinite density being forbidden) had perfect matter-antimatter symmetry. The initial “planckon” separated into a universe anti-universe pair with distinct closed 3-spaces. Symmetries were spontaneously broken (Grand Unification in reverse) resulting in separate strong, electromagnetic and weak forces and the 12 matter fermions with different masses. In the far future all complex matter (including protons) must decay, the expansion (and dark energy) must cease, and the universe and anti-universe become identical, each containing only electrons, positrons, photons and neutrinos. Entropic, psychological time is then extinct, with C, P, and T restored as perfect symmetries; time T is a closed loop. The universe anti-universe pair has zero total energy, a toroidal 3 + 1 spacetime topology, and arises as a fluctuation in an “Outer SpaceTime,” the Multiverse.