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Nature

A precision measurement of the gravitational redshift by the interference of matter waves

Holger Müller, Achim Peters, Steven Chu

Published Feb 1, 2010• 311 citations
Publisher
DOI
10.1038/nature08776

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Abstract In our paper, ‘Matter waves and clocks do not observe uniform gravitational fields’ (Asenbaum et al 2024 Phys. Scr. 99 046103), we analyze how measurements with matter waves and clocks depend on non-gravitational forces and on a UGF. The comment on our paper rests primarily on a misreading of the paper’s central physical setup. We do not consider the simplification that the redshift apparatus is fixed. Rather, our description remains general and keeps the non-gravitational forces independent of the UGF, which covers all configurations: the redshift setup being fixed, in free fall, or arbitrary upward or downward acceleration. This allows us to establish that the redshift measurement follows the non-gravitational forces rather than the UGF.

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A recent measurement of the gravitational redshift was based on interference of matter waves. Operation in microgravity can improve it by a factor of 10510^5105 and, in some models, even 101010^{10}1010.
Abstract In our paper, ‘Matter waves and clocks do not observe uniform gravitational fields’ (Asenbaum et al 2024 Phys. Scr. 99 046103), we analyze how measurements with matter waves and clocks depend on non-gravitational forces and on a UGF. The comment on our paper rests primarily on a misreading of the paper’s central physical setup. We do not consider the simplification that the redshift apparatus is fixed. Rather, our description remains general and keeps the non-gravitational forces independent of the UGF, which covers all configurations: the redshift setup being fixed, in free fall, or arbitrary upward or downward acceleration. This allows us to establish that the redshift measurement follows the non-gravitational forces rather than the UGF.