We present a synthesis of a 7-dimensional Janus two-time framework equipped with acompact T 2 sector and governed by a Principle of Least Information (PLI). An auxiliary timeinvolves a polarization-invariant plane (t, τ ) with a radial positive-definite covariance; underany polarization one can reconstruct a complex Hilbert space (via OS/GNS) and a completelypositive trace-preserving (CPTP) influence map arising from a Hubbard–Stratonovich (HS)quasi-free environment. Within an increment-stability class, PLI selects Gaussian lawsand sparse completely-monotone (CM) memories; strong positivity yields the Born rule,forbids third-order interference, and supports a posterior-sampling selection rule that isBorn-correct, no-signalling, and MDL-feasible. The 7D reduction still recovers GR exactly onobservable slices with fixed c and G, and the SM gauge sector with near-exact electroweak-scale couplings from a minimal set of compact geodesics and integers. We summarise crisplaboratory, table-top, and astrophysical signatures and state updated unification theorems. The Appendices are brief and mostly fleshed out in seperate publications you can find linked under Related Works. All can be found under the group identifier of "Part of 7D PLI 2t Grand Unification Model".

In "Development History of the 7D 2t PLI Janus model." We assemble a detailed, primary-source history of the Janus–PLI framework: a seven-dimensional (7D) two-time (2t) model in which a Principle of Least Information (PLI) selectsboth geometry and dynamics. The timeline traces the shift from early variable-c probesto the axiomatic PLI regime; we list every parameter choice (what, when, why) and howeach was fixed by minimal discrete data on a compact T 2. We also explain and justifythe mid-band 1/r trans-brane influence—a scale-window modification of the gravitationalresponse derived from a derivative-suppressed kernel consistent with PLI—and we statewhy 8D or larger models were not chosen. Throughout, we cross-reference the three sourcedocuments: the long notebook/transcript, the Paper A draft (v0.2), and the V14 foundationsnote.