Photon splitting in a laser field

High - energy photon splitting in a strong Coulomb field

The helicity amplitudes of the high-energy photon splitting in the external Coulomb field are obtained exactly in the parameter Zα. The cases of screened and unscreened potentials are investigated. The consideration is based on the quasiclassical approach, valid for small angles between all photon momenta. New representation of the qua-siclassical electron Green function is exploited. General e...

Photon Splitting in a Very Strong Magnetic Field.

Photon splitting in a very strong magnetic field is analyzed for energy ω < 2m. The amplitude obtained on the base of operator-diagram technique is used. It is shown that in a magnetic field much higher than critical one the splitting amplitude is independent on the field. Our calculation is in a good agreement with previous results of Adler and in a strong contradiction with recent paper of Me...

Photon splitting γ → νν̃ in an external magnetic field

Photon Splitting and Photon-plasmon Interaction in a Dense Medium

The photon splitting is the process with minimal rank of nonlinearity in the electromagnetic interactions. This kind of reaction is to be realized in various astrophysical objects (white dwarves, neutron stars), the early Universe and in the heavy ion collision experiments. In all these cases Furry’s theorem is violated because of the presence of the environments such as external fields or dens...

Photon splitting above the pair creation threshold in a strong magnetic field

A process of the photon splitting γ → γγ in a strong magnetic field is investigated below and above the pair creation threshold. Contrary to the statement by Baier e.a., the " allowed " channel γ → γ ⊥ γ ⊥ is shown not to be comprehensive for the splitting in the strong field because the " forbidden " channel γ → γ γ ⊥ is also essential. The partial amplitudes and the splitting probabilities ar...