Diagonal approximation of the form factor of the unitary group

Details Diagonal approximation of the form factor of the unitary group Diagonal approximation of the form factor of the unitary group

2005-09-21

arxiv.org/abs/nlin/0509037v1

J. Phys. A: Math. Gen. 39 (2006) L77-L84

Nonlinear Sciences

Chaotic Dynamics

9 pages

Scientific paper

10.1088/0305-4470/39/4/L01

The form factor of the unitary group U(N) endowed with the Haar measure characterizes the correlations within the spectrum of a typical unitary matrix. It can be decomposed into a sum over pairs of ``periodic orbits'', where by periodic orbit we understand any sequence of matrix indices. From here the diagonal approximation can be defined in the usual fashion as a sum only over pairs of identical orbits. We prove that as we take the dimension $N$ to infinity, the diagonal approximation becomes ``exact'', that is converges to the full form factor.

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