Recent Publications from Holger Frahm's Research Group
Kotousov, G. A., Lukyanov, S. L., & Shabetnik, D. A. (2026). Scaling limit of Q-functions for the Zr invariant inhomogeneous XXZ spin-12 chain near free fermion point. Nuclear Physics B, 1024, Article 117315. https://doi.org/10.1016/j.nuclphysb.2026.117315
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Frahm, H., Klümper, A., Wagner, D., & Zhang, X. (2026). Non-linear integral equations for the XXX spin-1/2 quantum chain with non-diagonal boundary fields. SciPost Physics, 20(1), Article 012. https://doi.org/10.21468/SciPostPhys.20.1.012, https://doi.org/10.48550/arXiv.2502.07229
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Frahm, H., Gehrmann, S., Nepomechie, R. I., & Retore, A. L. (2025). Quantum-group-invariant 𝐷(𝟸)𝑛+1 models: Bethe ansatz and finite-size spectrum. Journal of High Energy Physics, 12, Article 117. https://doi.org/10.1007/JHEP12(2025)117, https://doi.org/10.48550/arXiv.2509.00610
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Frahm, H., & Gehrmann, S. (2024). Finite-size spectrum of the staggered six-vertex model with antidiagonal boundary conditions. Nuclear Physics B, 1006, Article 116655. https://doi.org/10.1016/j.nuclphysb.2024.116655
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Gehrmann, S., Kotousov, G. A., & Lukyanov, S. L. (2024). Scaling limit of the ground state Bethe roots for the inhomogeneous XXZ spin - 1/2 chain. Nuclear Physics B, 1006, Article 116624. https://doi.org/10.48550/arXiv.2406.12102, https://doi.org/10.1016/j.nuclphysb.2024.116624
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Kotousov, G. A., & Shabetnik, D. A. (2024). Integrability and renormalizability for the fully anisotropic SU(2) principal chiral field and its deformations. Journal of high energy physics, 8(239), Article 239. https://doi.org/10.1007/JHEP08(2024)239
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Frahm, H., Gehrmann, S., & Kotousov, G. A. (2024). Scaling limit of the staggered six-vertex model with \(U_q(\mathfrak{sl}(2))\) invariant boundary conditions. SciPost Physics, 16(6), Article 149. https://doi.org/10.21468/SciPostPhys.16.6.149
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Kotoousov, G. A., Lacroix, S., & Teschner, J. (2024). Integrable sigma models at RG fixed points: quantisation as affine Gaudin models. Annales Henri Poincaré, 25(1), 843-1006. https://doi.org/10.1007/s00023-022-01243-4
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Frahm, H., Gehrmann, S., Nepomechie, R. I., & Retore, A. L. (2023). The D(2)3 spin chain and its finite-size spectrum. Journal of High Energy Physics, 2023(11), Article 095. https://doi.org/10.1007/JHEP11(2023)095
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Frahm, H., & Martins, M. J. (2023). Uq[OSp(3|2)] quantum chains with quantum group invariant boundaries. Nuclear Physics B, 995, Article 116329. https://doi.org/10.1016/j.nuclphysb.2023.116329, https://doi.org/10.48550/arXiv.2307.09412
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Westerfeld, D., Großpietsch, M., Kakuschke, H., & Frahm, H. (2023). Factorization of density matrices in the critical RSOS models. Journal of Statistical Mechanics: Theory and Experiment, 2023, Article 083104. https://doi.org/10.1088/1742-5468/aceeef
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Kotousov, G. A., & Lukyanov, S. L. (2023). On the scaling behaviour of an integrable spin chain with 𝒵𝑟 symmetry. Nuclear Physics, Section B, 993, Article 116269. https://doi.org/10.1016/j.nuclphysb.2023.116269
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Frahm, H., & Gehrmann, S. (2023). Integrable boundary conditions for staggered vertex models. Journal of Physics A: Mathematical and Theoretical, 56(2), Article 025001. https://doi.org/10.48550/arXiv.2209.06182, https://doi.org/10.1088/1751-8121/acb29f
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Frahm, H., & Martins, M. J. (2022). 𝑂𝑆𝑝(𝑛|𝟸𝑚) quantum chains with free boundaries. Nuclear Physics B, 980, Article 115799. https://doi.org/10.1016/j.nuclphysb.2022.115799
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Frahm, H., & Gehrmann, S. (2022). Finite size spectrum of the staggered six-vertex model with 𝑈𝑞(𝑠𝑙(𝟸))-invariant boundary conditions. Journal of High Energy Physics, 2022(1), Article 70. https://doi.org/10.1007/JHEP01(2022)070
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Frahm, H., & Westerfeld, D. (2021). Density matrices in integrable face models. SciPost Physics, 11(3), Article 057. https://doi.org/10.21468/SciPostPhys.11.3.057
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Kotoousov, G. A., & Lukyanov, S. (2021). ODE/IQFT correspondence for the generalized affine sl(2) Gaudin model. JHEP, 2021(9), Article 201. https://doi.org/10.1007/JHEP09%282021%29201
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