Predictions of Unified New Physics beyond Quantum Mechanics from the Feynman Path Integral Elementary Cycle Strings and Elementary Space-Time Crystals Donatello Dolce University of Camerino, Piazza Cavour 19F, 62032 Camerino, Italy Abstract By investigating the Feynman Path Integral we infer a novel stringy description of elementary particles, characterized by single compact (cyclic) world-line parameters playing the role of the particles’ internal clocks. Elementary particle dynamics are characterized by intrinsic periodicity in time, as implicit in undulatory mechanics and indirectly confirmed by recent developments in Time Crystals. The resulting theory has been proven in previous papers to be consistent with known physics from theoretical particle physics to condensed matter. It suggests a novel unified scenario of quantum and relativistic physics, potentially deterministic, and fully falsifiable having no fine-tunable parameters. The first evidences of such new physics could be observed by probing quantum phenomena with experimental time accuracy of the order of 10 −21 sec. We conclude with considerations about the entropic arrow of time. 1