The Nanoscale Search for Extra Dimensions
Most people are familiar with how things around us interact as a result of gravitational interactions. This behavior, known to follow an inverse square law (ISL), has been well explained by experiments down to less than 1 mm. Gravitational interactions over long-distances have also been supported by data collected from astronomy. However, until now, there has been little experimental evidence to support agreement with the ISL when the often-unpredictable quantum level is approached.
The statistical sensitivity achieved was made possible using the high intensity pulsed neutron beam at the J-PARC facility. The net electromagnetic neutrality of neutrons means that the experiments were not influenced by the electromagnetic background that hampers other approaches to probing short distance ISL deviations. The experiment, based on neutron-noble gas scattering, was the first time-of-flight neutron scattering study.
“As the performance of the world’s most powerful beamlines improves, we are able to significantly enhance our knowledge and understanding in step,” study corresponding author Tamaki Yoshioka of Kyushu University says. “Such iterative improvements can be very revealing. In the case of gravitational interactions we have made substantial steps towards understanding the dimensions of the space around us.”
It is hoped that the study, along with future work to improve sensitivity even further, will help shed light on whether the space in which we live is limited to three dimensions.
Contacts and sources:
Osaka University
Citation: Search for deviations from the inverse square law of gravity at nm range using a pulsed neutron beam.
Christopher C. Haddock, Noriko Oi, Katsuya Hirota, Takashi Ino, Masaaki Kitaguchi, Satoru Matsumoto, Kenji Mishima, Tatsushi Shima, Hirohiko M. Shimizu, W. Michael Snow, Tamaki Yoshioka. Physical Review D, 2018; 97 (6) DOI: 10.1103/PhysRevD.97.062002
Source: http://www.ineffableisland.com/2018/03/the-nanoscale-search-for-extra.html
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