Determining the Number of Symmetry Sectors in Composite Quantum Spectra

Nisarg Vyas; S. Harshini Tekur; M. S. Santhanam

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arXiv · 2610.03108

Determining the Number of Symmetry Sectors in Composite Quantum Spectra

Nisarg Vyas·S. Harshini Tekur·M. S. Santhanam

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Abstract

The spectral fluctuations in complex quantum systems are modeled in terms of spectra from random matrices. Quantitative agreement with random matrices holds only when the quantum spectrum is a pure sequence, and not a composite spectrum that mixes levels from different symmetry sectors. It was shown earlier that discrete symmetries in composite spectra can be detected using higher-order spacing ratio statistics provided the symmetry sectors are of equal dimensions. The general case is when the symmetry sectors have unequal dimensions, and the symmetries of the Hamiltonian system are unknown or only partially known. In this work, we address how the number of symmetry sectors can be determined from a composite spectrum arising in Hermitian and non-Hermitian settings. A Best Subset Technique is proposed for determining the number of the symmetry sectors by comparing the spectral fluctuations to that of an appropriate random matrix ensemble without requiring de-symmetrization. It is demonstrated using spectra from Gaussian, Wishart and Ginibre ensembles, and also for spectra drawn from many-body quantum systems.

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Nisarg Vyas, S. Harshini Tekur, M. S. Santhanam. 2026-10-02. Determining the Number of Symmetry Sectors in Composite Quantum Spectra. https://arxiv.org/abs/2610.03108

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