Unraveling the Mystery of Ancient Megalithic Engineering through Cosmology and Materials Mechanics

This paper proposes a new hypothesis that breaks through the framework of traditional archaeological chronology and engineering to explain the mystery of megalithic structures that exist widely around the world and whose technical features exceed current understanding.The core of this hypothesis is: 1) The Earth civilization has periodicity with the period of the Sun's movement around the Milky Way as the period, and at least two periods have already existed; 2) The continuous expansion of the universe leads to the continuous expansion of atoms and the continuous reduction of material strength. Based on this, a coupling model of "atomic characteristic scale - material strength - individual human physique and physiological function - engineering technology limit" was established, and the quantitative relationship between the maximum weight of a single stone in a megaliite building and its construction year, as well as the qualitative relationship between the splicing accuracy and the construction year, were derived. Analysis using this model indicates that the construction dates of ultra-precise megalithic structures such as Pumapengu, the Pyramids of Giza, and Balbek may be much older than traditional dating results, or they might be the products of the previous or even earlier civilization cycle.