Ponderomotive effects in multiphoton pair production

Kohlfürst, Christian; Alkofer, Reinhard

doi:10.1103/physrevd.97.036026

Cited by 49 publications

(71 citation statements)

References 81 publications

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“…where ω 1 > 0, ω 2 > 0 and Σ = (ω 1 + ω 2 )/2. It is now straightforward to check that (94) agrees with our WKB results for the amplitude: Just take A 1 and A 2 from (31) and (49), and integrate 2Re A * 1 A 2 as in (53). The momentum integrals are similar to the previous section and we hence find…”

Section: B Im γ3mentioning

confidence: 55%

Perturbative methods for assisted nonperturbative pair production

Torgrimsson

2019

Phys. Rev. D

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In the dynamically assisted Schwinger mechanism, the pair production probability is significantly enhanced by including a weak, rapidly varying field in addition to a strong, slowly varying field. In a previous paper we showed that several features of dynamical assistance can be understood by a perturbative treatment of the weak field. Here we show how to calculate the prefactors of the higher-order terms, which is important because the dominant contribution can come from higher orders. We give a new and independent derivation of the momentum spectrum using the worldline formalism, and extend our WKB approach to calculate the amplitude to higher orders. We show that these methods are also applicable to doubly assisted pair production.

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Section: B Im γ3mentioning

confidence: 55%

Perturbative methods for assisted nonperturbative pair production

Torgrimsson

2019

Phys. Rev. D

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“…Finally, we stress that the spatial dependence of the external background in the context of Schwinger pair production was considered so far in a very few studies [16,17,20,[26][27][28]. We expect that multidimensional inhomogeneities should be significant for a much broader class of possible scenarios.…”

Section: Discussionmentioning

confidence: 99%

Dynamically assisted Schwinger effect beyond the spatially-uniform-field approximation

2018

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We investigate the phenomenon of electron-positron pair production from vacuum in the presence of a strong electric field superimposed by a weak but fast varying pulse which substantially increases the total particle yield. We employ a nonperturbative numerical technique and perform the calculations beyond the spatially-uniform-field approximation, i.e., dipole approximation, taking into account the coordinate dependence of the fast component. The analysis of the main characteristics of the pair-production process (momentum spectra of particles and total amount of pairs) reveals a number of important features which are absent within the previously used approximation. In particular, the structure of the momentum distribution is modified both qualitatively and quantitatively, and the total number of pairs created as well as the enhancement factor due to dynamical assistance become significantly smaller.

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“…For instance, the LCFA may fail to properly describe the photon spectra in studies of nonlinear Compton scattering [17][18][19]. We also point out that according to recent results of precise calculations [20][21][22][23][24][25][26][27], the spatiotemporal inhomogeneities may also play a prominent role in the process of electron-positron pair production. In this paper, we perform exact calculations going beyond the LCFA in order to examine its validity.…”

Section: Introductionmentioning

confidence: 99%

Photon emission in strong fields beyond the locally-constant field approximation

2019

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We investigate a fundamental nonlinear process of vacuum photon emission in the presence of strong electromagnetic fields going beyond the locally-constant field approximation (LCFA), i.e., providing the exact treatment of the spatiotemporal inhomogeneities of the external field. We examine a standing electromagnetic wave formed by high-intensity laser pulses and benchmark the approximate predictions against the results obtained by means of a precise approach evaluating both the tadpole (reducible) and vertex (irreducible) contributions. It is demonstrated that the previously used approximate methods may fail to properly describe the quantitative characteristics of each of the two terms. In the case of the tadpole contribution, the LCFA considerably underestimates the number of photons emitted for sufficiently high frequency of the external field. The vertex term predicts emission of a great number of soft photons whose spectrum is no longer isotropic in contrast to the LCFA results. A notable difference among the photon yields along different spatial directions, which is not captured by the LCFA, represents an important signature for experimental studies of the photon emission process. Since this feature takes place unless the Keldysh parameter is much larger than unity, it can also be used in indirect observation of the Schwinger mechanism.

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Ponderomotive effects in multiphoton pair production

Cited by 49 publications

References 81 publications

Perturbative methods for assisted nonperturbative pair production

Perturbative methods for assisted nonperturbative pair production

Dynamically assisted Schwinger effect beyond the spatially-uniform-field approximation

Photon emission in strong fields beyond the locally-constant field approximation

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