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Effect of symmetrical frequency chirp on pair production

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arxiv 2103.00389 v1 pith:ZOPCS7M6 submitted 2021-02-28 hep-ph quant-ph

Effect of symmetrical frequency chirp on pair production

classification hep-ph quant-ph
keywords chirppairfrequencyproductionsymmetricalcircularfieldsmomentum
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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By using Dirac-Heisenberg-Wigner formalism we study electron-positron pair production for linear, elliptic, nearly circular and circular polarizations of electric fields with symmetrical frequency chirp, and we obtain Momentum spectra and pair yield. The difference of results among polarized fields is obvious for the small chirp. When the chirp parameter increases, the momentum spectra tend to exhibit the multiphoton pair generation that is characterized by the multi-concentric ring structure. The increase of number density is also remarkable compared to the case of asymmetrical frequency chirp. Note that the dynamically assisted Schwinger Mechanism plays an important role for the enhanced pair production in the symmetrical frequency chirp.

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