Dr. Peiran Yin Profile

Dr. Peiran Yin

at Nanjing Univ

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Proceedings Article | 13 March 2024 Presentation

Experiments with levitated force sensor searching for dark energy fifth forces

Peiran Yin, Huang Pu

Proceedings Volume PC12912, PC129121U (2024) https://doi.org/10.1117/12.3012163

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Dark energy, a mysterious form of energy that pervades the entire universe, is believed to be responsible for the accelerated expansion of the universe. Various theoretical attempts have been made to explain its elusive nature. One appealing model is the so-called symmetron dark energy model, which predicts a fifth force that interacts with matter. However, the screening of the fifth force in high-density environments poses a challenge for laboratory experiments. Although several experiments have constrained certain aspects of the model's parameter space, a vast and unexplored parameter space still remains. Here, we have constructed a novel experimental platform based on a magnetically levitated force sensor to search for the symmetron fifth force at the sub-millimeter scale, with a specially designed structure to minimize screening effects. Through this approach, we have improved the limits of the model by over six orders of magnitude within the three-dimensional parameter space. Our findings demonstrate the tremendous potential of our system in probing forces beyond the standard model.

Proceedings Article | 9 March 2023 Presentation

Challenging theories of dark energy with levitated force sensor

Peiran Yin

Proceedings Volume PC12447, PC124470P (2023) https://doi.org/10.1117/12.2657324

KEYWORDS: Sensors, Structural design, Physics, Physical sciences, Oscillators

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The nature of dark energy is the most compelling of all outstanding problems in physical science. Although various theories for dark energy have been proposed, experimental verification or exclusion of these theories has been faced with tremendous challenges not only at cosmic scales, but also at laboratory scales. In this work, we use a levitated force sensor to detect the fifth force predicted by the chameleon theory, one of the most compelling theories for dark energy. With no signatures of the fifth force detected, we decisively rule out, for the first time, the basic chameleon model as a candidate for dark energy.

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