Ebner, Lukas and Schaefer, Andreas and Seidl, Clemens and Mueller, Berndt and Yao, Xiaojun (2024) Eigenstate thermalization in (2+1)-dimensional SU(2) lattice gauge theory. PHYSICAL REVIEW D, 109 (1): 014504. ISSN 2470-0010, 2470-0029
Full text not available from this repository.Abstract
We present preliminary numerical evidence for the hypothesis that the Hamiltonian SU(2) gauge theory discretized on a lattice obeys the eigenstate thermalization hypothesis (ETH). To do so we study three approximations: (a) a linear plaquette chain in a reduced Hilbert space limiting the electric field basis to j = 0, z, (b) a two-dimensional honeycomb lattice with periodic or closed boundary condition and the same Hilbert space constraint, and (c) a chain of only three plaquettes but such a sufficiently large electric field Hilbert space (j <= 72) that convergence of all energy eigenvalues in the analyzed energy window is observed. While an unconstrained Hilbert space is required to reach the continuum limit of SU(2) gauge theory, numerical resource constraints do not permit us to realize this requirement for all values of the coupling constant and large lattices. In each of the three studied cases we check first for random matrix theory (RMT) behavior in the eigenenergy spectrum and then analyze the diagonal as well as the off-diagonal matrix elements between energy eigenstates for a few operators. Within current uncertainties all results for (a), (b) and (c) agree with ETH predictions. Furthermore, we find the off-diagonal matrix elements of the electric energy operator exhibit RMT behavior in frequency windows that are small enough in (b) and (c). To unambiguously establish ETH behavior and determine for which class of operators it applies, an extension of our investigations is necessary.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CHAOS |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Schäfer > Group Andreas Schäfer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 09 Dec 2025 10:03 |
| Last Modified: | 09 Dec 2025 10:03 |
| URI: | https://pred.uni-regensburg.de/id/eprint/64102 |
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