Spectral correlation functions of the sum of two independent complex Wishart matrices with unequal covariances

Akemann G, Checinski T, Kieburg M (2016)
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL 49(31): 315201.

Zeitschriftenaufsatz | Veröffentlicht| Englisch
 
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Abstract / Bemerkung
We compute the spectral statistics of the sum H of two independent complex Wishart matrices, each of which is correlated with a different covariance matrix. Random matrix theory enjoys many applications including sums and products of random matrices. Typically ensembles with correlations among the matrix elements are much more difficult to solve. Using a combination of supersymmetry, superbosonisation and bi-orthogonal functions we are able to determine all spectral k-point density correlation functions of H for arbitrary matrix size N. In the half-degenerate case, when one of the covariance matrices is proportional to the identity, the recent results by Kumar for the joint eigenvalue distribution of H serve as our starting point. In this case the ensemble has a bi-orthogonal structure and we explicitly determine its kernel, providing its exact solution for finite N. The kernel follows from computing the expectation value of a single characteristic polynomial. In the general nondegenerate case the generating function for the k-point resolvent is determined from a supersymmetric evaluation of the expectation value of k ratios of characteristic polynomials. Numerical simulations illustrate our findings for the spectral density at finite N and we also give indications how to do the asymptotic large-N analysis.
Stichworte
random matrix theory; bi-orthogonal ensemble; determinantal point; process; supersymmetry; covariance matrices
Erscheinungsjahr
2016
Zeitschriftentitel
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
Band
49
Ausgabe
31
Art.-Nr.
315201
ISSN
1751-8113
eISSN
1751-8121
Page URI
https://pub.uni-bielefeld.de/record/2905142

Zitieren

Akemann G, Checinski T, Kieburg M. Spectral correlation functions of the sum of two independent complex Wishart matrices with unequal covariances. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL. 2016;49(31): 315201.
Akemann, G., Checinski, T., & Kieburg, M. (2016). Spectral correlation functions of the sum of two independent complex Wishart matrices with unequal covariances. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, 49(31), 315201. doi:10.1088/1751-8113/49/31/315201
Akemann, G., Checinski, T., and Kieburg, M. (2016). Spectral correlation functions of the sum of two independent complex Wishart matrices with unequal covariances. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL 49:315201.
Akemann, G., Checinski, T., & Kieburg, M., 2016. Spectral correlation functions of the sum of two independent complex Wishart matrices with unequal covariances. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, 49(31): 315201.
G. Akemann, T. Checinski, and M. Kieburg, “Spectral correlation functions of the sum of two independent complex Wishart matrices with unequal covariances”, JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, vol. 49, 2016, : 315201.
Akemann, G., Checinski, T., Kieburg, M.: Spectral correlation functions of the sum of two independent complex Wishart matrices with unequal covariances. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL. 49, : 315201 (2016).
Akemann, Gernot, Checinski, Tomasz, and Kieburg, Mario. “Spectral correlation functions of the sum of two independent complex Wishart matrices with unequal covariances”. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL 49.31 (2016): 315201.

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arXiv: 1509.03466

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