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Vacuum refractive indices and helicity flip in strong-field QED

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arxiv 1312.6419 v2 pith:CPMQ2P6F submitted 2013-12-22 hep-ph hep-th

Victor Dinu , Tom Heinzl , Anton Ilderton , Mattias Marklund , Greger Torgrimsson This is my paper · ORCID
classification hep-phhep-th
keywords energyflipvacuumamplitudeshelicityindicesrefractiveaction
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Vacuum birefringence is governed by the amplitude for a photon to flip helicity or polarisation state in an external field. Here we calculate the flip and non-flip amplitudes in arbitrary plane wave backgrounds, along with the induced spacetime-dependent refractive indices of the vacuum. We compare the behaviour of the amplitudes in the low energy and high energy regimes, and analyse the impact of pulse shape and energy. We also provide the first lightfront-QED derivation of the coefficients in the Heisenberg-Euler effective action.

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