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

Abstract

Abstract We study the weak gravity conjecture, the swampland distance conjecture and the emergence proposal for N $$ \mathcal{N} $$ = 1 orientifold compactifications of type IIB string theory with O3-/O7-planes. We allow for orientifold projections with h + 2 , 1 ≠ 0 $$ {h}_{+}^{2,1}\ne 0 $$ which gives rise to closed-string U(1) gauge fields, and our findings show that certain structures present for N $$ \mathcal{N} $$ = 2 compactifications are not present for N $$ \mathcal{N} $$ = 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 $$ {h}_{+}^{2,1} $$ sector.

Keywords

• D-branes
• Supergravity Models