Swampland conjectures for type IIB orientifolds with closed-string U(1)s

Abstract

We study the weak gravity conjecture, the swampland distance conjecture and the emergence proposal for $\mathcal{N}=1$ orientifold compactifications of type IIB string theory with O3-/O7-planes. We allow for orientifold projections with $h_{+}^{2,1}\ne 0$ which gives rise to closed-string $U(1)$ gauge fields, and our findings show that certain structures present for $\mathcal{N}=2$ compactifications are not present for $\mathcal{N}=1$. In particular, assumptions about stability have to be relaxed and we encounter an ambiguity for the emergence of gauge symmetries associated with the $h_{+}^{2,1}$ sector.

arXiv comment26+3 pages

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