English

A comment on 4d and 5d BPS states

High Energy Physics - Theory 2018-09-21 v2

Abstract

We discuss a phenomenon in supersymmetric field theory and string theory whereby compactifying one of the dimensions of spacetime on an arbitrarily large circle can cause BPS states to become unstable. We exemplify this by considering 5d N=1 theories on a circle and their embeddings into M-theory via geometric engineering. This implicates a subtle relationship between the BPS states of M-theory on a Calabi-Yau threefold, X, and those of type IIA on X with an arbitrary value of the coupling constant. Intuition for this phenomenon is provided by considering F-theory on a complex K3 surface in a limit where it degenerates to a real K3 surface.

Keywords

Cite

@article{arxiv.1808.01529,
  title  = {A comment on 4d and 5d BPS states},
  author = {Shamit Kachru and Max Zimet},
  journal= {arXiv preprint arXiv:1808.01529},
  year   = {2018}
}

Comments

10 pages; v2: minor corrections

R2 v1 2026-06-23T03:24:35.690Z