Transportable Optical Lattice Clocks and General Relativity
Abstract
Optical lattice clocks (OLCs) enable us to measure time and frequency with a fractional uncertainty at level, which is 2 orders of magnitude better than Cs clocks. In this article, after briefly reviewing OLCs and the history of testing the fundamental principles of general relativity, we report our experiments of measuring the gravitational redshift between RIKEN and The University of Tokyo, and at Tokyo Skytree using transportable OLCs. We also discuss a couple of future applications of OLCs, such as detecting gravitational waves in space and relativistic geodesy. The possibility of testing second-order parametrized post-Newtonian potential around the Earth is also mentioned.
Cite
@article{arxiv.2502.06104,
title = {Transportable Optical Lattice Clocks and General Relativity},
author = {Hisaaki Shinkai and Masao Takamoto and Hidetoshi Katori},
journal= {arXiv preprint arXiv:2502.06104},
year = {2025}
}
Comments
22 pages, 7 figures, to be published in International Journal of Modern Physics D (2025), and also in the book "One Hundred and Ten Years of General Relativity: From Genesis and Empirical Foundations to Gravitational Waves, Cosmology and Quantum Gravity}," edited by Wei-Tou Ni (World Scientific, Singapore, 2025)