Title: Pair production feedback in gamma-ray binaries
Abstract: Gamma-Ray binaries are sources of variable electromagnetic radiation in a very broad spectral range, extending up to TeV energies. They consist of a massive star and a compact object. When the compact object is a pulsar with ultrarelativistic wind, such a binary demonstrates strong feedback effects. The pulsar wind is loaded with energetic electron-positron pairs as a result of two-photon pair production, these pairs emit gamma-radiation at the pulsar wind termination shock, and the emitted gamma-quanta produce new pairs. The pair feedback limits the Lorentz factor of the pulsar wind and creates a population of very energetic pairs, whose radiation may be responsible for the observed gamma-ray signal.