Prof. Jun Nishimura of KEK Theory Center and his collaborators built a model that can be used to derive physical phenomena such as the emergence of (3+1)-dimensional expanding space-time through calculations from superstring theory in (9+1)-dimensional space-time, which is considered the ultimate theory that describes our Universe. The research results were published in Physical Review Letters on January 31, 2025 (US Eastern Time). https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.134.041603

It has been discovered that the model proposed so far has hidden mathematical problems associated with the center-of-mass motion of the Universe. By taking the rest frame of the Universe appropriately, a model free of mathematical problems was constructed. Based on this model, numerical simulations are currently underway using  the supercomputer “Fugaku” and others, and are expected to greatly advance our understanding of the beginning of the Universe. This work is based on collaboration with Yuhma Asano of the University of Tsukuba, and Naoyuki Yamamori and Worapat Piensuk, students majoring in particle and nuclear physics at SOKENDAI.