Strong shock in a uniformly expanding universe

  title={Strong shock in a uniformly expanding universe},
  author={Gennadii S. Bisnovatyi-Kogan},
  journal={Gravitation and Cosmology},
An exact analytic solution of self-similar equations is obtained for propagation of a strong shock in a flat expanding Friedman universe. The time and radial dependences of the density and velocity of the polytropic gas behind the shock wave are obtained. The shock velocity in the expanding medium decreases as ~t−1/5, slower than the shock velocity in the static uniform medium (~t−3/5), and its radius increases ~t4/5, more rapidly than in a uniform non-gravitating medium (~t2/5). So, the shock… 
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