Expectation values after an integrable boundary quantum quench
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
| Veröffentlicht: |
2026
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| _version_ | 1866918486076293120 |
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| author | Bajnok, Zoltán Fülepi, Dávid Lencsés, Máté |
| author_facet | Bajnok, Zoltán Fülepi, Dávid Lencsés, Máté |
| contents | We investigate an integrable boundary quench, in which one integrable boundary condition is suddenly switched to another. We develop a general framework for analyzing the resulting real-time dynamics based on form factors of bulk and boundary-changing operators. We first study the problem at the conformal point of the Lee-Yang model and then extend the analysis to its massive perturbation, where we examine the time evolution of the pre-quench vacuum and compute the vacuum-to-vacuum matrix elements of local operators inserted after the quench. The analytical results are validated by numerical calculations using the truncated conformal space approach adapted to boundary-changing situations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_04823 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Expectation values after an integrable boundary quantum quench Bajnok, Zoltán Fülepi, Dávid Lencsés, Máté High Energy Physics - Theory Statistical Mechanics We investigate an integrable boundary quench, in which one integrable boundary condition is suddenly switched to another. We develop a general framework for analyzing the resulting real-time dynamics based on form factors of bulk and boundary-changing operators. We first study the problem at the conformal point of the Lee-Yang model and then extend the analysis to its massive perturbation, where we examine the time evolution of the pre-quench vacuum and compute the vacuum-to-vacuum matrix elements of local operators inserted after the quench. The analytical results are validated by numerical calculations using the truncated conformal space approach adapted to boundary-changing situations. |
| title | Expectation values after an integrable boundary quantum quench |
| topic | High Energy Physics - Theory Statistical Mechanics |
| url | https://arxiv.org/abs/2605.04823 |