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Nature 444, 823-824 (14 December 2006) | doi:10.1038/444823a; Published online 13 December 2006
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Optics: Momentum in an uncertain light
Ulf Leonhardt1
Abstract
How much momentum does light transfer to a material through which it passes? This is a surprisingly opaque matter, contested for almost a century, that is still the object of theory and experimentation.
One of Rudolf Peierls' Surprises in Theoretical Physics1 is the difficulty of assessing the momentum of light in transparent materials such as glass or water. Despite its being a seemingly basic concept, rival theories2, 3 predict values for the momentum that differ by considerable factors, and that have been hotly debated for many decades.
- Ulf Leonhardt is in the School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK.
Email: ulf@st-andrews.ac.uk
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