51 research outputs found
Symmetric and conserved energy-momentum tensors in moving media
A symmetric and conserved energy-momentum tensor for a scalar field in a
moving medium is derived using the Gordon metric. When applied to an
electromagnetic field, the method gives a similar result. This approach thus
points a way out of the old Abraham-Minkowski controversy about the correct
energy-momentum tensors for the electromagnetic field in a material medium. The
new tensor describes the properties of the field while the Abraham tensor
contains information about the field coupled to the medium.Comment: 5 pages, LaTeX, two references added with commentar
How I got to work with Feynman on the covariant quark model
In the period 1968 - 1974 I was a graduate student and then a postdoc at
Caltech and was involved with the developments of the quark and parton models.
Most of this time I worked in close contact with Richard Feynman and thus was
present from the parton model was proposed until QCD was formulated. A personal
account is presented how the collaboration took place and how the various
stages of this development looked like from the inside until QCD was
established as a theory for strong interactions with the partons being quarks
and gluons.Comment: LaTeX, 20 pages, 2 figures. Contribution to "50 Years of Quarks", to
be published by World Scientifi
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