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New Upper Limit For Photon Mass

DEC 01, 1968

DOI: 10.1063/1.3034650

Physics Today

If the photon has a mass, say Alfred S. Goldhaber and Michael M. Nieto in Phys. Rev. Letters (21, 567, 1968), it is less than ${4.0×10}^{−48} gram .$ They derive their number by Erwin Schrödinger’s method. A finite mass adds a term to Maxwell’s equations and makes the calculated vector potential fall off exponentially like a Yukawa potential carried by a finite‐mass meson. In the solution the principal observable effect is an apparent constant component to be added to the earth’s dipole magnetic field.

© 1968. American Institute of Physics

This Content Appeared In

Volume 21, Number 12

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