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Peer-reviewedCC BY 4.0SciPost

On non-relativistic integrable models and 4d SCFTs

4 affiliations
  1. 1Department of Physics, Technion
  2. 2C.N. Yang Institute for Theoretical Physics
  3. 3Asia Pacific Center for Theoretical Physics
  4. 4Pohang University of Science and Technology

Abstract

We elaborate on the relation between the generalized Schur index of {\cal N}=2 SCFTs in four dimensions and the non-relativistic limit of the elliptic Ruijsenaars-Schneider model. In particular we discuss explicitly how to express generalized Schur indices of theories of class {\cal S} in terms of elliptic Jack functions. For example, in the A_1 A 1 case the indices are given naturally in terms of eigenfunctions of the Lamé equation. We use the expression in terms of eigenfunctions to further check the recent observation that the generalized Schur indices of different theories in the Deligne-Cvitanović series can be mapped onto each other. This mapping implies non trivial identities on unrefined sums of eigenfunctions of non-relativistic elliptic Calogero-Moser models associated to different root systems. We claim then that the non-relativistic limits of various integrable models give rise naturally to generalized Schur-like limits of classes of {\cal N}=1 SCFTs. As an example we discuss the relation of the Inozemtsev model, the non relativistic limit of the van Diejen model, and compactifications of the rank Q Q E-string theory. We argue that in general the “Schur index” of {\cal N}=1 4d 4 d SCFTs can be understood as being related to the free fermionic limit of a non-relativistic integrable model.

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BibTeX
@article{zeev2026nonrelativistic,
  title = {{On non-relativistic integrable models and 4d SCFTs}},
  author = {Rotem Ben Zeev and Anirudh Deb and Hee-Cheol Kim and Shlomo S. Razamat},
  journal = {SciPost},
  year = {2026},
  month = nov,
  doi = {10.21468/scipostphys.21.5.110},
  url = {http://scipost.org/SciPostPhys.21.5.110},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - On non-relativistic integrable models and 4d SCFTs
AU  - Rotem Ben Zeev
AU  - Anirudh Deb
AU  - Hee-Cheol Kim
AU  - Shlomo S. Razamat
PY  - 2026
DA  - 2026/11/02
JO  - SciPost
DO  - 10.21468/scipostphys.21.5.110
UR  - http://scipost.org/SciPostPhys.21.5.110
AB  - We elaborate on the relation between the generalized Schur index of {\cal N}=2 SCFTs in four dimensions and the non-relativistic limit of the elliptic Ruijsenaars-Schneider model. In particular we discuss explicitly how to express generalized Schur indices of theories of class {\cal S} in terms of elliptic Jack functions. For example, in the A_1 A 1 case the indices are given naturally in terms of eigenfunctions of the Lamé equation. We use the expression in terms of eigenfunctions to further check the recent observation that the generalized Schur indices of different theories in the Deligne-Cvitanović series can be mapped onto each other. This mapping implies non trivial identities on unrefined sums of eigenfunctions of non-relativistic elliptic Calogero-Moser models associated to different root systems. We claim then that the non-relativistic limits of various integrable models give rise naturally to generalized Schur-like limits of classes of {\cal N}=1 SCFTs. As an example we discuss the relation of the Inozemtsev model, the non relativistic limit of the van Diejen model, and compactifications of the rank Q Q E-string theory. We argue that in general the “Schur index” of {\cal N}=1 4d 4 d SCFTs can be understood as being related to the free fermionic limit of a non-relativistic integrable model.
SN  - 2542-4653
ER  -