Vacuum self-focussing of very intense laser beams
Abstract
We argue that long-range photon-photon attraction induced by the dipole interaction of two electron-positron loops can lead to "vacuum self-focussing" of very intense laser beams. The focussing angle theta(F) is found to increase with the beam intensity I as theta(F) I(4/3); for the laser beams available at present or in the near future, theta(F) 10(-10)--10(-7).
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