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Hot Topics in Strong-Field Physics

Date Di, 06.03.2012 - Di, 06.03.2012
Time 11:00 am
Speaker H. R. Reiss, Max-Born-Institut and American University
Location ETH Zurich, Hönggerberg, HPF G-6
Program A result shown in an earlier lecture; that the well-known and much-used length gauge has a natural extension outside the limits of the dipole approximation, is explored further to examine its logical consequences. It is shown that this extended length gauge is responsible for a variety of false implications that exist in strong-field physics. Most of these errors follow from the seemingly anomalous result that the all-important ponderomotive potential is missing from this extended length-gauge result, despite the fact that it is nominally gauge-equivalent to the usual Coulomb-gauge description of charged particles in plane-wave fields. A second example is given of a physical contrast between two different gauges for the same set of fields. The explanation for these apparent paradoxes is presented, leading to a generalized formulation of strong-field electrodynamics in which an additional constraint is found to be necessary for the presence of gauge equivalence.
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