Statistical properties of strings

The statistical properties of a network of cosmic strings in flat space time are analysed using the microcanonical ensemble. This technique, based on the quantised bosonic string shows that the system is characterised by two distinct phases, corresponding to string densities above and below a ''critical'' density defined in terms of the string tension. The importance of these results for the cosmic string theory of galaxy formation is then discussed. Finally, it is pointed out why the canonical ensemble is not a good description of strings at high densities. (orig.)