We revisit the problem of classical gravitational bremsstrahlung which occurs by collisions of ultra-relativistic charges. The collision is characterized by the Lorentz-factor~$\gamma$ and the impact parameter~$b$. Within the perturbation theory, we compute the total energy, radiated as a gravitational wave, as well as numerous spectral, angular and polarization distributions. The most of radiation is emitted into a beaming cone with linear angle of order~$1/\gamma$. The average frequency is of order~$\gamma^2/b$.
04.30.Db Wave generation and sources
$^1$MSU
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