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SU(2) channels the cancellation of K3 BPS states

Taormina, Anne; Wendland, Katrin

SU(2) channels the cancellation of K3 BPS states Thumbnail


Authors

Katrin Wendland



Abstract

The conformal field theoretic elliptic genus, an invariant for N = (2, 2) superconformal field theories, counts the BPS states in any such theory with signs, according to their bosonic or fermionic nature. For K3 theories, this invariant is the source of the Mathieu Moonshine phenomenon. There, the net number of 1 4 -BPS states is positive for any conformal dimension above the massless threshold, but it may arise after cancellation of the contributions of an equal number of bosonic and fermionic BPS states present in non-generic theories, as is the case for the class of Z2-orbifolds of toroidal SCFTs. Nevertheless, the space Hb of all BPS states that are generic to such orbifold theories provides a convenient framework to construct a particular generic space of states of K3 theories. We find a natural action of the group SU(2) on a subspace of Hb which is compatible with the cancellations of contributions from the corresponding non-generic states. In fact, we propose that this action channels those cancellations. As a by-product, we find a new subspace of the generic space of states in Hb.

Citation

Taormina, A., & Wendland, K. (2020). SU(2) channels the cancellation of K3 BPS states. Journal of High Energy Physics, 2020(04), Article 184. https://doi.org/10.1007/jhep04%282020%29184

Journal Article Type Article
Acceptance Date Mar 30, 2020
Online Publication Date Apr 28, 2020
Publication Date Apr 30, 2020
Deposit Date Apr 1, 2020
Publicly Available Date May 7, 2020
Journal Journal of High Energy Physics
Print ISSN 1126-6708
Electronic ISSN 1029-8479
Publisher Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Peer Reviewed Peer Reviewed
Volume 2020
Issue 04
Article Number 184
DOI https://doi.org/10.1007/jhep04%282020%29184
Public URL https://durham-repository.worktribe.com/output/1267031
Publisher URL https://doi.org/10.1007/JHEP04(2020)184
Related Public URLs http://arxiv.org/abs/1908.03148

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Publisher Licence URL
http://creativecommons.org/licenses/by/4.0/

Copyright Statement
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.






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