How to simulate global cosmic strings with large string tension

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, ln(f(a)/H) similar to 70, which influences the network dynamics by giving the strings large tensions T similar or equal to pi f(a)(2) ln(f(a)/H). We present a new numerical approach to simulate such global string networks, capturing the tension without an exponentially large lattice.