M. Kunz et R. Durrer, CALCULATION OF THE LARGE-N LIMIT OF CMB ANISOTROPIES INDUCED BY GLOBAL SCALAR FIELDS, International journal of theoretical physics, 36(11), 1997, pp. 2489-2501
Usually large 3D simulations are used to calculate the cosmic microwav
e background anisotropies induced by global scalar fields. By going to
the large N limit and solving the equations of motion analytically, w
e can drastically reduce the amount of numerical computations needed,
while still finding results quite similar to the corresponding functio
ns in the texture model.