Abstract
A wealth of empirical and numerical evidence suggests universality for local fluctuations in quantum energy or quasi-energy spectra of systems that display global chaos in their classical phase spaces .
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- 1.
The reader’s attention is drawn to the overall factor 2 in the exponent of (5.2.19); it stems from Kramers’ degeneracy. When dealing with the GSE, some authors choose to redefine the trace operation as one half the usual trace, so as to account for only a single eigenvalue in each Kramers’ doublet; correspondingly, these authors take the determinant as the square root of the usual one. Throughout this book we will keep the standard definitions.
- 2.
In Sect. 10.8, an alternative method for dealing with problems of this kind will be presented.
- 3.
Actually, (5.12.13) requires l 1≠l 2≠ … ≠l n. When some of the l i coincide such that k different values are assumed, 1 ≤ k ≤ n, with multiplicities n 1, n 2, … , n k and \(\sum n_{i} = n ,\) the factor 1∕n! must be replaced by 1∕(n 1!n 2! … n k!). For the Taylor coefficients E l, given in (5.12.18) or (5.12.21), the distinction in question is irrelevant, due to the appearance of another factor n 1! … n k!∕n! accompanying the summation over the configurations {l i}.
- 4.
For the sake of typographical convenience, δ(m, n) here denotes the Kronecker symbol usually written as δ mn.
- 5.
Analytic continuation to imaginary a ij yields the Fresnel integrals to be met in Chap. 10.
- 6.
The two-point function of the GUE will be treated in Chap. 6.
- 7.
The (N →∞) limit K(τ) of the form factor is related to the Fourier transform \(\tilde {Y}(\tau )\) of the cluster function Y (e) by \(K(\tau )= \delta (\tau )+1-\tilde {Y}(\tau )\).
- 8.
By dynamic rather than random-matrix arguments, a case could be construed for a possibly competing scale, the “Ehrenfest” time \(\tau _E=N^{-1}\ln N\) alias \(n_E=\ln N\), i.e., the time scale on which a perturbation of the Floquet operator F becomes noticeable in expectation values of observables, given global classical chaos.
- 9.
Newton was concerned with relationships between different symmetric functions of N variables [40].
- 10.
- 11.
The symbol \([\frac {N}{2}]\) denotes N∕2 for even N and the next smaller integer for odd N.
- 12.
Like most authors in random-matrix theory, Mehta [7] included, we keep here to a sign tradition differing from the otherwise more widespread one by the factor(−1)n−1 for the cumulant C n.
- 13.
To remove the following quotation marks, think of the rows of the determinant swapped pairwise, the first with the last, the second with the last but one, etc.
- 14.
Indeed, generalizing the joint distribution of eigenvalues (5.4.1) to arbitrary real β = n − 1, one is led to a Wigner distribution \(P_{\beta }(S)=AS^{\beta }\mathrm {e}^{-BS^2}\) with A and B fixed by normalization and \(\overline {S}=1\) which for β →∞ approaches the delta function δ(S − 1).
- 15.
The reader might (and should!) wonder whether the “orthogonal” version of (5.20.1) goes “symplectic” for half-integer j. It does not. The reason is T 2 = +1 for all j in that case since two components of an angular momentum can simultaneously be given real representations.
- 16.
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Haake, F., Gnutzmann, S., Kuś, M. (2018). Random-Matrix Theory. In: Quantum Signatures of Chaos. Springer Series in Synergetics. Springer, Cham. https://doi.org/10.1007/978-3-319-97580-1_5
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