Oscillation of Massive Fields (IMAGE) Hong Kong University of Science and Technology Caption The massive fields oscillate quantum mechanically and have their intrinsic frequencies. From observing the oscillation of the massive fields, we are able to reconstruct the time when the fluctuations are created in the primordial universe, and thus the expansion history of the primordial universe. Credit Department of Physics, HKUST Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.