The large N limit from the lattice ∗
نویسنده
چکیده
A numerical study of the string tension and of the masses of the lowest-lying glueballs is performed in SU(N) gauge theories for 2 ≤ N ≤ 8 in D=3+1 and 2 ≤ N ≤ 6 in D=2+1. It is shown that for the string tension a smooth N → ∞ limit exists that depends only on the ’t Hooft coupling λ = gN . An extrapolation of the masses of the lightest glueballs to N = ∞ using a power series in 1/N shows that the leading correction to the infinite N value accounts for finite N effects for N at least as small as 3 and all the way down to N = 2 in many cases. k-string tension ratios and possible issues connected with correlation functions at large N are also discussed.
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