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Quantum Simulation

The O\(n→infty\) Rotor Model and the Quantum Spherical Model on Graphs

arXiv
Authors: Nikita Titov, Andrea Trombettoni

Year

2026

Paper ID

3565

Status

Preprint

Abstract Read

~2 min

Abstract Words

121

Citations

N/A

Abstract

We show that the large n limit of the O(n) quantum rotor model defined on a general graph has the same critical behavior as the corresponding quantum spherical model and that the critical exponents depend solely on the spectral dimension ds of the graph. To this end, we employ a classical to quantum mapping and use known results for the large n limit of the classical O(n) model on graphs. Away from the critical point, we discuss the interplay between the Laplacian and the Adjacency matrix in the whole parameter plane of the quantum Hamiltonian. These results allow us to paint the full picture of the O(n) quantum rotor model on graphs in the large n limit.

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  • We show that the large n limit of the O(n) quantum rotor model defined on a general graph has the same critical behavior as the corresponding quantum spherical model and that...

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