Eigenvector continuation for the pairing Hamiltonian
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866909106553487360 |
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| author | Franzke, Margarida Companys Tichai, Alexander Hebeler, Kai Schwenk, Achim |
| author_facet | Franzke, Margarida Companys Tichai, Alexander Hebeler, Kai Schwenk, Achim |
| contents | The development of emulators for the evaluation of many-body observables has gained increasing attention over the last years. In particular the framework of eigenvector continuation (EC) has been identified as a powerful tool when the Hamiltonian admits for a parametric dependence. By training the emulator on a set of training data the many-body solution for arbitrary parameter values can be robustly predicted in many cases. Furthermore, it can be used to resum perturbative expansions that otherwise diverge. In this work, we apply EC to the pairing Hamiltonian and show that EC-resummed perturbation theory is in qualitative agreement with the exact solution and that EC-based emulators robustly predict the ground-state energy once the training data are chosen appropriately. In particular the phase transition from the normal to the superfluid regime is quantitatively predicted using a very low number of training points. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2302_08373 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Eigenvector continuation for the pairing Hamiltonian Franzke, Margarida Companys Tichai, Alexander Hebeler, Kai Schwenk, Achim Nuclear Theory Strongly Correlated Electrons The development of emulators for the evaluation of many-body observables has gained increasing attention over the last years. In particular the framework of eigenvector continuation (EC) has been identified as a powerful tool when the Hamiltonian admits for a parametric dependence. By training the emulator on a set of training data the many-body solution for arbitrary parameter values can be robustly predicted in many cases. Furthermore, it can be used to resum perturbative expansions that otherwise diverge. In this work, we apply EC to the pairing Hamiltonian and show that EC-resummed perturbation theory is in qualitative agreement with the exact solution and that EC-based emulators robustly predict the ground-state energy once the training data are chosen appropriately. In particular the phase transition from the normal to the superfluid regime is quantitatively predicted using a very low number of training points. |
| title | Eigenvector continuation for the pairing Hamiltonian |
| topic | Nuclear Theory Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2302.08373 |