Testing the correctness of the Poynting vector \vec E\times\vec B as the momentum density of gauge fields

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dc.creatorChen, Xiang-Song
dc.creatorChen, Xiang-Bai
dc.creatorSun, Wei-Min
dc.creatorWang, Fan
dc.date2007-10-08
dc.date.accessioned2026-07-07T08:34:40Z
dc.date.available2026-07-07T08:34:40Z
dc.descriptionFollowing our recent finding that the renowned formula $\vec x\times (\vec E\times\vec B)$ is not the correct density for the electromagnetic angular momentum, here we examine the validity of the Poynting vector $\vec E \times\vec B$ as the electromagnetic momentum density (or energy flux). The competitor is the gauge-invariant canonical momentum $E^i\vec \nabla A^i_\perp$. It often gives the same result as $\vec E\times\vec B$, but we propose that a delicate measurement (of the {\em azimuthal} energy flow in polarized atomic radiations) can make a discrimination. By clarifying the profound difference between two kinds of energy-momentum tensors: the canonical (or mechanical) one and the symmetric (or gravitational) one, we predict that it is $E^i\vec \nabla A^i_\perp$ that would pass the delicate experimental test. Our observations have far-reaching implications for understanding the source of gravity, and the nucleon momentum as well.
dc.description3 pages, no figure
dc.identifierhttps://arxiv.org/abs/0710.1427
dc.identifierhttp://arxiv.org/abs/0710.1427
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/139516
dc.subjectHigh Energy Physics - Phenomenology
dc.titleTesting the correctness of the Poynting vector \vec E\times\vec B as the momentum density of gauge fields
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