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We study de Sitter configurations in ten-dimensional string models wheresupersymmetry is either absent or broken at the string scale. To this end, wederive expressions for the cosmological constant in general warped fluxcompactifications with localized sources, which yield no-go theorems thatextend previous works on supersymmetric cases. We frame our results within adimensional reduction and connect them to a number of Swampland conjectures,corroborating them further in the absence of supersymmetry. Furthermore, weconstruct a top-down string embedding of de Sitter brane-world cosmologieswithin unstable anti-de Sitter landscapes, providing a concrete realization ofa recently revisited proposal.

de Sitter in non-supersymmetric string theories: no-go theorems and brane-worlds