  Global string networks may be relevant in axion production in the early
Universe, as well as other cosmological scenarios. Such networks contain a
large hierarchy of scales between the string core scale and the Hubble scale,
log(f/H) around 70, which influences the network dynamics by giving the strings
large tensions T = pi f^2 log(f/H). We present a new numerical approach to
simulate such global string networks, capturing the tension without an
exponentially large lattice.
